Pentair (PNR) 10-K 27 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Document Information [Line Items]
Entity Registrant Name	PENTAIR PLC
Entity Central Index Key	77,360
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false
Trading Symbol	PNR
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding	181,765,451
Entity Public Float		$ 9,520,686,063

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended														12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 1,260.9	$ 1,226.8		$ 1,265.3		$ 1,183.5		$ 1,188.1	$ 1,210.7		$ 1,301.2		$ 1,190		$ 4,936.5	$ 4,890	$ 4,616.4
Cost of goods sold															3,107.4	3,095.9	3,017.6
Gross profit	468.3	455.3		483.2		422.3		440.1	440.9		481.8		431.3		1,829.1	1,794.1	1,598.8
Selling, general and administrative															1,032.5	979.3	884
Research and development															115.8	114.1	98.7
Operating income	137.4	192.2		212.8		138.4		161.8	182.8		203.4		152.7		680.8	700.7	616.1
Other (income) expense
Loss on sale of businesses															4.2	3.9	3.2
Gain (Loss) on Extinguishment of Debt															(101.4)	0	0
Equity income of unconsolidated subsidiaries															(1.3)	(4.3)	(1.5)
Interest income															(9.9)	(8.3)	(4.7)
Interest expense															97.2	148.4	106.6
Income from continuing operations before income taxes															489.2	561	512.5
Provision for income taxes															9.2	109.4	115.4
Net income from continuing operations	203.9	127.1		68.3		80.7		109.6	117.5		132.7		91.8		480	451.6	397.1
Income (loss) from discontinued operations, net of tax															5.4	70	(466.8)
Gain (loss) from sale / impairment of discontinued operations, net of tax	(17.8)	(1.7)		200.6		0		0	0.6		0		0		181.1	0.6	(6.7)
Net income (loss)	$ 189.6	$ 125.4		$ 263.7		$ 87.8		$ 131	$ 141		$ 142.8		$ 107.4		666.5	522.2	(76.4)
Comprehensive income (loss), net of tax
Net income (loss)															666.5	522.2	(76.4)
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)															497.5	(83)	(264.9)
Changes in market value of derivative financial instruments, net of tax															(4.6)	(8.3)	0.2
Comprehensive income (loss)															$ 1,159.4	$ 430.9	$ (341.1)
Earnings (loss) per ordinary share
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.12	$ 0.70		$ 0.38		$ 0.44		$ 0.60	$ 0.65		$ 0.73		$ 0.50		$ 2.64	$ 2.49	$ 2.20
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.07)	(0.01)		1.07		0.04		0.12	0.13		0.06		0.09		1.03	0.39	(2.62)
Earnings Per Share, Basic	1.05	0.69	[1]	1.45	[1]	0.48	[1]	0.72	0.78	[1]	0.79	[1]	0.59	[1]	3.67	2.88	(0.42)
Income (Loss) from Continuing Operations, Per Diluted Share	1.11	0.69		0.37		0.44		0.60	0.64		0.73		0.50		2.61	2.47	2.17
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.07)	(0.01)		1.06		0.04		0.11	0.13		0.05		0.09		1.02	0.38	(2.59)
Diluted	$ 1.04	$ 0.68	[1]	$ 1.43	[1]	$ 0.48	[1]	$ 0.71	$ 0.77	[1]	$ 0.78	[1]	$ 0.59	[1]	$ 3.63	$ 2.85	$ (0.42)
Weighted average ordinary shares outstanding
Basic (shares)															181.7	181.3	180.3
Diluted (shares)															183.7	183.1	182.6
[1]	Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period.

Consolidated Statements Of Ope3

Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Changes in Cumulative translation adjustment inclusive of divestiture of business reclassified to gain from sale	$ 374.2

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 113.3	$ 238.5
Accounts and notes receivable, net of allowances of $22.6 and $25.6, respectively	831.6	764
Inventories	581	524.2
Other current assets	222.9	253.4
Current assets held for sale	0	891.9
Total current assets	1,748.8	2,672
Property, plant and equipment, net	545.5	538.6
Other assets
Goodwill	4,351.1	4,217.4
Intangibles, net	1,558.4	1,631.8
Other non-current assets	429.9	182.1
Non-current assets held for sale	0	2,292.9
Total other assets	6,339.4	8,324.2
Total assets	8,633.7	11,534.8
Current liabilities
Current maturities of long-term debt and short-term borrowings	0	0.8
Accounts payable	495.7	436.6
Employee compensation and benefits	186.6	166.1
Other current liabilities	517.1	511.5
Current liabilities held for sale	0	356.2
Total current liabilities	1,199.4	1,471.2
Other liabilities
Long-term debt	1,440.7	4,278.4
Pension and other post-retirement compensation and benefits	285.6	253.4
Deferred tax liabilities	394.8	609.5
Other non-current liabilities	275.4	162
Non-current liabilities held for sale	0	505.9
Total liabilities	3,595.9	7,280.4
Equity
Ordinary shares $0.01 par value, 426.0 authorized, 180.3 and 181.8 issued at December 31, 2017 and December 31, 2016, respectively	1.8	1.8
Additional paid-in capital	2,797.7	2,920.8
Retained earnings	2,481.7	2,068.1
Accumulated other comprehensive loss	(243.4)	(736.3)
Total equity	5,037.8	4,254.4
Total liabilities and equity	$ 8,633.7	$ 11,534.8

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowances	$ 22.6	$ 25.6
Common stock, par value (per share)	$ 0.01	$ 0.01
Common stock, shares authorized	426,000,000	426,000,000
Common stock, shares issued	180,300,000	181,800,000

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income (loss)	$ 666.5	$ 522.2	$ (76.4)
(Income) loss from discontinued operations, net of tax	(5.4)	(70)	466.8
(Gain) loss from sale / impairment of discontinued operations, net of tax	(181.1)	(0.6)	6.7
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by (used for) operating activities of continuing operations
Equity income of unconsolidated subsidiaries	(1.3)	(4.3)	(1.5)
Depreciation	85.2	84.6	81.2
Amortization	97.7	96.4	68.1
Loss on sale of businesses	4.2	3.9	3.2
Deferred income taxes	(159.7)	(16.1)	(2.3)
Share-based compensation	39.6	34.2	33
Impairment of trade names	32	13.3	0
Gain (Loss) on Extinguishment of Debt	(101.4)	0	0
Excess tax benefits from share-based compensation	0	(8)	(6)
Amortization of bridge financing debt issuance costs	0	0	10.8
Pension and other post-retirement expense	29.2	31.8	9.4
Pension and other post-retirement contributions	(15.7)	(13.5)	(12.7)
Changes in assets and liabilities, net of effects of business acquisitions
Accounts and notes receivable	(30.9)	21.3	(6.2)
Inventories	(29.4)	34.3	54.7
Other current assets	(5.9)	(15.8)	(27.3)
Accounts payable	32.6	38	10.6
Employee compensation and benefits	10.2	7	(15.6)
Other current liabilities	(29.3)	51.6	(16.6)
Other non-current assets and liabilities	34.1	(107.9)	17.8
Net cash provided by (used for) operating activities of continuing operations	674	702.4	597.7
Net cash provided by (used for) operating activities of discontinued operations	(53.8)	159	141.6
Net cash provided by (used for) operating activities of continuing operations	620.2	861.4	739.3
Investing activities
Capital expenditures	(70.9)	(117.8)	(91.3)
Proceeds from sale of property and equipment	7.9	24.7	4.6
Acquisitions, net of cash acquired	(59.5)	(25)	(1,913.9)
Net cash provided by (used for) investing activities of continuing operations	2,636.9	(123.3)	(2,003.6)
Net cash provided by (used for) investing activities of discontinued operations	(6.5)	1.5	38.1
Net cash provided by (used for) investing activities	2,630.4	(121.8)	(1,965.5)
Financing activities
Net receipts (repayments) of short-term borrowings	(0.8)	0.8	(2.3)
Net receipts (repayments) of commercial paper and revolving long-term debt	(913.1)	(385.3)	363.5
Proceeds from long-term debt	0	0	1,714.8
Repayment of long-term debt	(2,009.3)	(0.7)	(356.6)
Debt issuance costs	0	0	(26.8)
Payment for Debt Extinguishment or Debt Prepayment Cost	94.9	0	0
Excess tax benefits from share-based compensation	0	8	6
Shares issued to employees, net of shares withheld	37.2	20.7	19.4
Repurchases of ordinary shares	(200)	0	(200)
Dividends paid	(251.7)	(243.6)	(231.7)
Net cash provided by (used for) financing activities	(3,432.6)	(600.1)	1,286.3
Effect of exchange rate changes on cash and cash equivalents	56.8	(27.3)	(44.2)
Change in cash and cash equivalents	(125.2)	112.2	15.9
Cash and cash equivalents, beginning of year	238.5	126.3	110.4
Cash and cash equivalents, end of year	$ 113.3	$ 238.5	$ 126.3

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) shares in Millions, $ in Millions	Total	Common shares	Treasury shares	Capital contribution reserve	Retained earnings	Accumulated other comprehensive income (loss)
Beginning Balance at Dec. 31, 2014	$ 4,663.8	$ 2	$ (1,251.9)	$ 4,250	$ 2,044	$ (380.3)
Balance (in shares) at Dec. 31, 2014		(202.4)	(19.9)
Net income (loss)	(76.4)				(76.4)
Other comprehensive income, net of tax	(264.7)					(264.7)
Tax benefit of share-based compensation	5.7			5.7
Dividends declared	(174.4)			1.5	175.9
Share repurchase (in shares)		(3.1)
Share repurchases	$ (200)			200
Treasury Stock, Shares, Retired		19.1	(19.1)
Treasury Stock, Retired, Cost Method, Amount		$ (0.2)	$ 1,210.9	(1,210.7)
Exercise of options, net of shares tendered for payment (in shares)	0.1		0.7
Exercise of options, net of shares tendered for payment	$ 31.1		$ 34.6	(3.5)
Issuance of restricted shares, net of cancellations (in shares)	0.3		0.2
Issuance of restricted shares, net of cancellations			$ 9.4	(9.4)
Shares surrendered by employees to pay taxes (in shares)	0.1		(0.1)
Shares surrendered by employees to pay taxes	$ (9.3)		$ (3)	(6.3)
Share-based compensation	33			33
Balance (in shares) at Dec. 31, 2015		(180.5)	0
Ending Balance at Dec. 31, 2015	4,008.8	$ 1.8	$ 0	2,860.3	1,791.7	(645)
Net income (loss)	522.2				522.2
Other comprehensive income, net of tax	(91.3)					(91.3)
Tax benefit of share-based compensation	5.5			5.5
Dividends declared	(245.8)			0	(245.8)
Exercise of options, net of shares tendered for payment (in shares)		1
Exercise of options, net of shares tendered for payment	31.6			31.6
Issuance of restricted shares, net of cancellations (in shares)		0.5
Issuance of restricted shares, net of cancellations				0
Shares surrendered by employees to pay taxes (in shares)		(0.2)
Shares surrendered by employees to pay taxes	(10.8)			(10.8)
Share-based compensation	34.2			34.2
Balance (in shares) at Dec. 31, 2016		(181.8)	0
Ending Balance at Dec. 31, 2016	4,254.4	$ 1.8	$ 0	2,920.8	2,068.1	(736.3)
Net income (loss)	666.5				666.5
Other comprehensive income, net of tax	492.9					492.9
Dividends declared	(252.9)				(252.9)
Share repurchase (in shares)		(3)	0
Share repurchases	$ (200)	$ 0	$ 0	(200)
Exercise of options, net of shares tendered for payment (in shares)	1.2	1.2
Exercise of options, net of shares tendered for payment	$ 45.6			45.6
Issuance of restricted shares, net of cancellations (in shares)		0.4
Shares surrendered by employees to pay taxes (in shares)		(0.1)
Shares surrendered by employees to pay taxes	(8.3)			(8.3)
Share-based compensation	39.6			39.6
Balance (in shares) at Dec. 31, 2017		(180.3)	0
Ending Balance at Dec. 31, 2017	$ 5,037.8	$ 1.8	$ 0	$ 2,797.7	$ 2,481.7	$ (243.4)

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Business Pentair plc and its consolidated subsidiaries (the "Company" or "Pentair") is a focused diversified industrial manufacturing company comprising two reporting segments: Water and Electrical. Proposed separation On May 9, 2017, we announced that our Board of Directors approved a plan to separate our Water business and Electrical business into two independent, publicly-traded companies (the "Proposed Separation"). The Proposed Separation is expected to occur through a tax-free spin-off of the Electrical business to Pentair shareholders. Completion of the Proposed Separation is subject to certain customary conditions, including, among other things, final approval of the transaction by Pentair's Board of Directors, receipt of tax opinions and rulings and effectiveness of appropriate filings with the SEC. Upon completion of the Proposed Separation, it is anticipated that Electrical's jurisdiction of organization will be Ireland, but that it will manage its affairs so that it will be centrally managed and controlled in the United Kingdom (the "U.K.") and therefore will have its tax residency in the U.K. We are targeting April 30, 2018 for the completion of the Proposed Separation; however, there can be no assurance regarding the ultimate timing of the Proposed Separation or that the Proposed Separation will be completed. Basis of presentation The accompanying consolidated financial statements include the accounts of Pentair and all subsidiaries, both the United States ("U.S.") and non-U.S., which we control. Intercompany accounts and transactions have been eliminated. Investments in companies of which we own 20% to 50% of the voting stock or have the ability to exercise significant influence over operating and financial policies of the investee are accounted for using the equity method of accounting and as a result, our share of the earnings or losses of such equity affiliates is included in the Consolidated Statements of Operations and Comprehensive Income (Loss). The consolidated financial statements have been prepared in U.S. dollars ("USD") and in accordance with accounting principles generally accepted in the United States of America ("GAAP"). Fiscal year Our fiscal year ends on December 31. Beginning with the first quarter of 2016, we report our interim quarterly periods on a calendar quarter basis. Prior to the first quarter of 2016, we reported our interim quarterly periods on a 13-week basis ending on a Saturday. Use of estimates The preparation of our consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes, disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include our accounting for valuation of goodwill and indefinite lived intangible assets, estimated losses on accounts receivable, estimated realizable value on excess and obsolete inventory, percentage of completion revenue recognition, assets acquired and liabilities assumed in acquisitions, estimated selling proceeds from assets held for sale, contingent liabilities, income taxes and pension and other post-retirement benefits. Actual results could differ from our estimates. Revenue recognition We recognize revenue when it is realized or realizable and has been earned. Revenue is recognized when persuasive evidence of an arrangement exists, shipment or delivery has occurred (depending on the terms of the sale), our price to the buyer is fixed or determinable, and collectability is reasonably assured. Generally, there is no post-shipment obligation on product sold other than warranty obligations in the normal and ordinary course of business. In the event significant post-shipment obligations were to exist, revenue recognition would be deferred until substantially all obligations were satisfied. Percentage of completion Revenue from certain long-term contracts is recognized over the contractual period under the percentage of completion method of accounting. Under this method, sales and gross profit are recognized as work is performed either based on the relationship between the actual costs incurred and the total estimated costs at completion ("the cost-to-cost method") or based on efforts for measuring progress towards completion in situations in which this approach is more representative of the progress on the contract than the cost-to-cost method. Changes to the original estimates may be required during the life of the contract and such estimates are reviewed on a regular basis. Sales and gross profit are adjusted using the cumulative catch-up method for revisions in estimated total contract costs. These reviews have not resulted in adjustments that were significant to our results of operations. Estimated losses are recorded when identified. Claims against customers are recognized as revenue upon settlement. We record costs and earnings in excess of billings on uncompleted contracts within Other current assets and billings in excess of costs and earnings on uncompleted contracts within Other current liabilities in the Consolidated Balance Sheets. Sales returns The right of return may exist explicitly or implicitly with our customers. Our return policy allows for customer returns only upon our authorization. Goods returned must be product we continue to market and must be in salable condition. At the time of sale, we reduce revenue for the estimated effect of returns. Estimated sales returns include consideration of historical sales levels, the timing and magnitude of historical sales return levels as a percent of sales, type of product, type of customer and a projection of this experience into the future. Pricing and sales incentives We record estimated reductions to revenue for customer programs and incentive offerings including pricing arrangements, promotions and other volume-based incentives at the later of the date revenue is recognized or the incentive is offered. Sales incentives given to our customers are recorded as a reduction of revenue unless we (1) receive an identifiable benefit for the goods or services in exchange for the consideration and (2) we can reasonably estimate the fair value of the benefit received. Pricing is established at or prior to the time of sale with our customers and we record sales at the agreed-upon net selling price. However, we allow customers to apply for a refund of a percentage of the original purchase price if they can demonstrate sales to a qualifying end customer. At the time of sale, we estimate the anticipated refund to be paid based on historical experience and reduce sales for the probable cost of the discount. The cost of these refunds is recorded as a reduction in gross sales. Volume-based incentives involve rebates that are negotiated at or prior to the time of sale with the customer and are redeemable only if the customer achieves a specified cumulative level of sales or sales increase. Under these incentive programs, at the time of sale, we estimate the anticipated rebate to be paid based on forecasted sales levels. These forecasts are updated at least quarterly for each customer and sales are reduced for the anticipated cost of the rebate. If the forecasted sales for a customer changes, the accrual for rebates is adjusted to reflect the new amount of rebates expected to be earned by the customer. Shipping and handling costs Amounts billed to customers for shipping and handling are recorded in Net sales in the accompanying Consolidated Statements of Operations and Comprehensive Income (Loss). Shipping and handling costs incurred by Pentair for the delivery of goods to customers are included in Cost of goods sold in the accompanying Consolidated Statements of Operations and Comprehensive Income (Loss). Research and development We conduct research and development ("R&D") activities primarily in our own facilities, which consist primarily of the development of new products, product applications and manufacturing processes. We expense R&D costs as incurred. R&D expenditures during 2017 , 2016 and 2015 were $115.8 million , $114.1 million and $98.7 million , respectively. Cash equivalents We consider highly liquid investments with original maturities of three months or less at the date of acquisition to be cash equivalents. Trade receivables and concentration of credit risk We record an allowance for doubtful accounts, reducing our receivables balance to an amount we estimate is collectible from our customers. Estimates used in determining the allowance for doubtful accounts are based on current trends, aging of accounts receivable, periodic credit evaluations of our customers' financial condition, and historical collection experience. We generally do not require collateral. No customer receivable balances exceeded 10% of total net receivable balances as of December 31, 2017 or December 31, 2016 . Inventories Inventories are stated at the lower of cost or market with substantially all inventories recorded using the first-in, first-out ("FIFO") cost method. Property, plant and equipment, net Property, plant and equipment is stated at historical cost. We compute depreciation by the straight-line method based on the following estimated useful lives: Years Land improvements 5 to 20 Buildings and leasehold improvements 5 to 50 Machinery and equipment 3 to 15 Significant improvements that add to productive capacity or extend the lives of properties are capitalized. Costs for repairs and maintenance are charged to expense as incurred. When property is retired or otherwise disposed of, the recorded cost of the assets and their related accumulated depreciation are removed from the Consolidated Balance Sheets and any related gains or losses are included in income. We review the recoverability of long-lived assets to be held and used, such as property, plant and equipment, when events or changes in circumstances occur that indicate the carrying value of the asset or asset group may not be recoverable. The assessment of possible impairment is based on our ability to recover the carrying value of the asset or asset group from the expected future pre-tax cash flows (undiscounted and without interest charges) of the related operations. If these cash flows are less than the carrying value of such asset or asset group, an impairment loss is recognized for the difference between estimated fair value and carrying value. Impairment losses on long-lived assets held for sale are determined in a similar manner, except that fair values are reduced for the cost to dispose of the assets. The measurement of impairment requires us to estimate future cash flows and the fair value of long-lived assets. We recorded no impairment charges in 2017 or 2016 in conjunction with restructuring activities. During 2015 we recorded $5.1 million of asset impairment in conjunction with restructuring activities. Goodwill and identifiable intangible assets Goodwill Goodwill represents the excess of the cost of acquired businesses over the net of the fair value of identifiable tangible net assets and identifiable intangible assets purchased and liabilities assumed. Goodwill is tested at least annually for impairment and is tested for impairment more frequently if events or changes in circumstances indicate that the asset might be impaired. The impairment test is performed using a two-step process. In the first step, the fair value of each reporting unit is compared with the carrying amount of the reporting unit, including goodwill. If the estimated fair value is less than the carrying amount of the reporting unit there is an indication that goodwill impairment exists and a second step must be completed in order to determine the amount of the goodwill impairment, if any, that should be recorded. In the second step, an impairment loss is recognized for any excess of the carrying amount of the reporting unit's goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The fair value of each reporting unit is determined using a discounted cash flow analysis and market approach. Projecting discounted future cash flows requires us to make significant estimates regarding future revenues and expenses, projected capital expenditures, changes in working capital and the appropriate discount rate. Use of the market approach consists of comparisons to comparable publicly-traded companies that are similar in size and industry. Actual results may differ from those used in our valuations. This non-recurring fair value measurement is a "Level 3" measurement under the fair value hierarchy described below. In developing our discounted cash flow analysis, assumptions about future revenues and expenses, capital expenditures and changes in working capital, are based on our annual operating plan and long-term business plan for each of our reporting units. These plans take into consideration numerous factors including historical experience, anticipated future economic conditions, changes in raw material prices and growth expectations for the industries and end markets we participate in. These assumptions are determined over a six year long-term planning period. The six year growth rates for revenues and operating profits vary for each reporting unit being evaluated. Revenues and operating profit beyond 2023 are projected to grow at a perpetual growth rate of 3.0% . Discount rate assumptions for each reporting unit take into consideration our assessment of risks inherent in the future cash flows of the respective reporting unit and our weighted-average cost of capital. We utilized discount rates ranging from 9.0% to 9.5% in determining the discounted cash flows in our fair value analysis. In estimating fair value using the market approach, we identify a group of comparable publicly-traded companies for each reporting unit that are similar in terms of size and product offering. These groups of comparable companies are used to develop multiples based on total market-based invested capital as a multiple of earnings before interest, taxes, depreciation and amortization ("EBITDA"). We determine our estimated values by applying these comparable EBITDA multiples to the operating results of our reporting units. The ultimate fair value of each reporting unit is determined considering the results of both valuation methods. We completed step one of our annual goodwill impairment evaluation as of the first day of the fourth quarter of 2017 , 2016 and 2015 with each reporting unit's fair value in excess of its carrying value. During the latter part of the fourth quarter of 2015, the oil and gas industry continued to deteriorate, leading management to reconsider its estimates for future profitability of our former Valves & Controls business and thereby increasing the likelihood that the associated goodwill could be impaired. As such, we concluded that a triggering event occurred during the fourth quarter of 2015 requiring that we test Valves & Controls goodwill for impairment. As a result, we reperformed our step one analysis as of December 31, 2015. Consistent with our annual test, the fair value was estimated using both a discounted cash flow analysis and market approach. The results of our step one goodwill impairment testing as of December 31, 2015 indicated that the fair value of Valves & Controls was below its carrying value. Accordingly, we performed the step two test and concluded the goodwill of Valves & Controls was impaired. As a result, we recorded a non-cash goodwill impairment charge of $515.2 million for the year ended December 31, 2015. The impairment is included in Income (loss) from discontinued operations, net of tax in our Consolidated Statements of Operations and Comprehensive Income (Loss). Identifiable intangible assets Our primary identifiable intangible assets include: customer relationships, trade names, proprietary technology and patents. Identifiable intangibles with finite lives are amortized and those identifiable intangibles with indefinite lives are not amortized. Identifiable intangible assets that are subject to amortization are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Identifiable intangible assets not subject to amortization are tested for impairment annually or more frequently if events warrant. We complete our annual impairment test during the fourth quarter each year for those identifiable assets not subject to amortization. The impairment test for trade names consists of a comparison of the fair value of the trade name with its carrying value. Fair value is measured using the relief-from-royalty method. This method assumes the trade name has value to the extent that the owner is relieved of the obligation to pay royalties for the benefits received from them. This method requires us to estimate the future revenue for the related brands, the appropriate royalty rate and the weighted average cost of capital. The non-recurring fair value measurement is a "Level 3" measurement under the fair value hierarchy described below. An impairment charge of $25.2 million was recorded in 2017 related to certain trade names in Water and Electrical as a result of lower forecasted sales volume or rebranding strategies implemented in the fourth quarter of 2017. An impairment charge of $13.3 million was recorded in 2016 related to a trade name in Electrical as a result of a rebranding strategy implemented in the fourth quarter of 2016. The trade name impairment charges were recorded in Selling, general and administrative in our Consolidated Statements of Operations and Comprehensive Income (Loss). As noted above, during the latter part of the fourth quarter of 2015, the oil and gas industry continued to deteriorate, leading management to reconsider its estimates for future profitability of our former Valves & Controls business and thereby increasing the likelihood that the associated intangible assets could be impaired. As such, we concluded that a triggering event occurred during the fourth quarter of 2015 requiring that we test Valves & Controls trade names for impairment. As a result of this test, an impairment charge of $39.5 million was recorded in 2015 related to trade names in the Valves & Controls business classified as held for sale. The impairment is included in Income (loss) from discontinued operations, net of tax in our Consolidated Statements of Operations and Comprehensive Income (Loss). Income taxes We use the asset and liability approach to account for income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period when the change is enacted. We maintain valuation allowances unless it is more likely than not that all or a portion of the deferred tax assets will be realized. Changes in valuation allowances from period to period are included in our tax provision in the period of change. We recognize the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Pension and other post-retirement plans We sponsor U.S. and non-U.S. defined-benefit pension and other post-retirement plans. The pension and other post-retirement benefit costs for company-sponsored benefit plans are determined from actuarial assumptions and methodologies, including discount rates and expected returns on plan assets. These assumptions are updated annually and are disclosed in Note 13. We recognize changes in the fair value of plan assets and net actuarial gains or losses for pension and other post-retirement benefits annually in the fourth quarter each year ("mark-to-market adjustment") and, if applicable, in any quarter in which an interim remeasurement is triggered. Net actuarial gains and losses occur when the actual experience differs from any of the various assumptions used to value our pension and other post-retirement plans or when assumptions change, as they may each year. The remaining components of pension expense, including service and interest costs and estimated return on plan assets, are recorded on a quarterly basis. Insurance subsidiary We insure certain general and product liability, property, workers' compensation and automobile liability risks through our regulated wholly-owned captive insurance subsidiary, Penwald Insurance Company ("Penwald"). Reserves for policy claims are established based on actuarial projections of ultimate losses. As of December 31, 2017 and 2016 , reserves for policy claims were $61.5 million ( $13.2 million included in Other current liabilities and $48.3 million included in Other non-current liabilities ) and $63.0 million ( $13.2 million included in Other current liabilities and $49.8 million included in Other non-current liabilities ), respectively. Share-based compensation We account for share-based compensation awards on a fair value basis. The estimated grant date fair value of each option award is recognized in income on an accelerated basis over the requisite service period (generally the vesting period). The estimated fair value of each option award is calculated using the Black-Scholes option-pricing model. From time to time, we have elected to modify the terms of the original grant. These modified grants are accounted for as a new award and measured using the fair value method, resulting in the inclusion of additional compensation expense in our Consolidated Statements of Operations and Comprehensive Income (Loss). Restricted share awards and units are recorded as compensation cost on an accelerated basis over the requisite service periods based on the market value on the date of grant. Performance share units ("PSUs") are stock awards where the ultimate number of shares issued will be contingent on the Company's performance against certain financial performance targets. The fair value of each PSU is based on the market value on the date of grant. We recognize expense related to the estimated vesting of our PSUs granted. The estimated vesting of the PSUs is based on the probability of achieving certain financial performance thresholds over the specified performance period. Earnings (loss) per ordinary share Basic earnings (loss) per share are computed by dividing net income (loss) attributable to Pentair plc by the weighted-average number of ordinary shares outstanding. Diluted earnings (loss) per share are computed by dividing net income (loss) attributable to Pentair plc by the weighted-average number of ordinary shares outstanding including the dilutive effects of ordinary share equivalents. Derivative financial instruments We recognize all derivatives, including those embedded in other contracts, as either assets or liabilities at fair value in our Consolidated Balance Sheets. If the derivative is designated and is effective as a cash-flow hedge, the effective portion of changes in the fair value of the derivative are recorded in Accumulated other comprehensive income (loss) ("AOCI") as a separate component of equity in the Consolidated Balance Sheets and are recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss) when the hedged item affects earnings. If the underlying hedged transaction ceases to exist or if the hedge becomes ineffective, all changes in fair value of the related derivatives that have not been settled are recognized in current earnings. For a derivative that is not designated as or does not qualify as a hedge, changes in fair value are reported in earnings immediately. Gains and losses on net investment hedges are included in AOCI as a separate component of equity in the Consolidated Balance Sheets. We use derivative instruments for the purpose of hedging interest rate and currency exposures, which exist as part of ongoing business operations. We do not hold or issue derivative financial instruments for trading or speculative purposes. All other contracts that contain provisions meeting the definition of a derivative also meet the requirements of and have been designated as, normal purchases or sales. Our policy is not to enter into contracts with terms that cannot be designated as normal purchases or sales. From time to time, we may enter into short duration foreign currency contracts to hedge foreign currency risks. Fair value measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities measured at fair value are classified using the following hierarchy, which is based upon the transparency of inputs to the valuation as of the measurement date: Level 1: Valuation is based on observable inputs such as quoted market prices (unadjusted) for identical assets or liabilities in active markets. Level 2: Valuation is based on inputs such as quoted market prices for similar assets or liabilities in active markets or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3: Valuation is based upon other unobservable inputs that are significant to the fair value measurement. In making fair value measurements, observable market data must be used when available. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Foreign currency translation The financial statements of subsidiaries located outside of the U.S. are generally measured using the local currency as the functional currency, except for certain corporate entities outside of the U.S. which are measured using USD. Assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date. Income and expense items are translated at average monthly rates of exchange. The resultant translation adjustments are included in AOCI, a separate component of equity. New accounting standards In March 2017, the Financial Accounting Standards Board ("FASB") issued a new accounting standard which requires the presentation of all components of net periodic benefit cost other than service costs outside of operating income. Only the service cost component will be included in operating income and eligible for capitalization in assets. The new guidance related to the presentation of the components of net periodic benefit cost within the Consolidated Statement of Operations will be applied retrospectively. The new guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within that reporting period. We adopted this standard on January 1, 2018. As a result of adoption, $10.7 million and $13.3 million of pension and post-retirement expense and $ 12.7 million of pension and post-retirement benefit will be reclassified out of operating income for the years ended December 31, 2017, 2016 and 2015, respectively. In March 2016, the FASB issued a new accounting standard for share-based payments. The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the Consolidated Statements of Cash Flows. We adopted the new standard in the first quarter of 2017. The impact of the adoption resulted in the following: • All excess tax benefits and deficiencies arising from employee share-based payment awards, and dividends on those awards, will be recognized within income taxes in the period in which they occur rather than within additional paid-in-capital. Our adoption of this requirement under the new standard had no material impact for the year ended December 31, 2017. • The Company no longer presents excess tax benefits within cash flows from financing activities in the Consolidated Statements of Cash Flows; instead these are now reflected within cash flows from operating activities. The Company elected to apply this change prospectively. • The Company elected not to change its policy on accounting for forfeitures and continues to estimate the total number of awards for which the requisite service period will not be rendered. • The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of our diluted earnings per share for the year ended December 31, 2017. This increased diluted weighted average common shares outstanding by less than 300,000 shares for the year ended December 31, 2017. In February 2016, the FASB issued new accounting requirements regarding accounting for leases, which require an entity to recognize both assets and liabilities arising from financing and operating leases, along with additional qualitative and quantitative disclosures. The new requirements are effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and early adoption is permitted. We have not yet determined the potential effects on our financial condition or results of operations. In May 2014, the FASB issued new accounting requirements for the recognition of revenue from contracts with customers. The new rules require entities to recognize revenue when they transfer control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new requirements also include additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The requirements are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. We adopted the new revenue guidance as of January 1, 2018, using the modified retrospective transition method of adoption applied to those contracts which were not completed as of that date. An adjustment will be recorded to our 2018 beginning retained earnings for the cumulative effect of the change. In preparation for adoption of the new guidance, we have implemented appropriate changes to our business processes, systems and controls to support preparation of financial information and have reached conclusions on key accounting assessments related to the standard. As a result of these assessments, the adoption of the new standard will not have a material impact on our consolidated financial statements, including the presentation of revenues in our consolidated statements of operations.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions Material acquisition On September 18, 2015, we acquired, as part of Electrical, all of the outstanding shares of capital stock of ERICO Global Company ("ERICO") for approximately $1.8 billion of cash (the "ERICO Acquisition"). ERICO is a leading global manufacturer and marketer of engineered electrical and fastening products for electrical, mechanical and civil applications. ERICO has employees in 30 countries across the world with recognized brands including CADDY fixing, fastening and support products and ERICO electrical grounding, bonding and connectivity products. The purchase price has been allocated based on the fair value of assets acquired and liabilities assumed at the date of the ERICO Acquisition. The purchase price allocation was completed in the third quarter of 2016. The following table summarizes our estimates of the fair values of the assets acquired and liabilities assumed in the ERICO Acquisition as previously reported at December 31, 2015 and as revised for adjustments made during 2016: In millions As Originally Reported As Revised Cash $ 11.8 $ 11.8 Accounts receivable 75.9 75.9 Inventories 102.4 101.8 Other current assets 2.9 2.8 Property, plant and equipment 53.4 53.1 Identifiable intangible assets 1,033.8 1,033.8 Goodwill 1,061.9 1,031.0 Current liabilities (97.2 ) (94.7 ) Deferred income taxes, including current (418.8 ) (382.3 ) Other liabilities (8.0 ) (15.1 ) Purchase price $ 1,818.1 $ 1,818.1 The excess of purchase price over tangible net assets and identified intangible assets acquired was allocated to goodwill in the amount of $1,031.0 million , none of which is deductible for income tax purposes. Identifiable intangible assets acquired as part of the ERICO Acquisition included $228.4 million of indefinite-lived trade name intangible assets and $805.4 million of definite-lived customer relationships with an estimated useful life of 21 years. The following unaudited pro forma consolidated condensed financial results of operations for the year ended December 31, 2015 is presented as if the ERICO Acquisition was consummated on January 1, 2015, the beginning of the comparable prior annual reporting period: Year ended December 31 In millions, except share and per-share data 2015 Pro forma net sales $ 5,002.6 Pro forma net income from continuing operations 460.4 Pro forma earnings per ordinary share - continuing operations Basic $ 2.55 Diluted 2.52 The unaudited pro forma net income from continuing operations for the year ended December 31, 2015 excludes the impact of $24.6 million of non-recurring transaction related and bridge financing costs. The pro forma condensed consolidated financial information has been prepared for comparative purposes only and includes certain adjustments, as noted above. The adjustments are estimates based on currently available information and actual amounts may differ materially from these estimates. They do not reflect the effect of costs or synergies that would have been expected to result from the integration of the ERICO Acquisition. The pro forma information does not purport to be indicative of the results of operations that actually would have resulted had the ERICO Acquisition occurred on January 1, 2015. Other acquisitions During 2017 , we completed acquisitions with purchase prices totaling $59.5 million in cash, net of cash acquired. Identifiable intangible assets acquired included $19.1 million of definite-lived customer relationships with an estimated useful life of 11 years. In November 2016, we completed an acquisition as part of Water with a purchase price of $25.0 million in cash, net of cash acquired. In April 2015, we acquired, as part of Electrical, all of the outstanding shares of capital stock of Nuheat Industries Limited ("Nuheat") for $96.0 million in cash ( 120.5 million Canadian dollars translated at the April 2, 2015 exchange rate), net of cash acquired. In November 2015, cash of $0.9 million ( 1.2 million Canadian dollars translated at the average monthly exchange rate) was paid to Nuheat in settlement of a working capital adjustment. Based in Canada, Nuheat is a leading manufacturer of electric floor heating systems that are distributed across North America. Total goodwill recorded as part of the purchase allocation was $43.2 million , none of which is tax deductible. Definite-lived intangible assets acquired consisted of customer relationships of $53.3 million , with an estimated useful life of 17 years . The pro forma impact of these acquisitions was not material.

Discontinued Operations Discont

Discontinued Operations Discontinued Operations	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On April 28, 2017 we completed the sale of the Valves & Controls business to Emerson Electric Co. for $3.15 billion in cash. The sale resulted in a gain of $181.1 million , net of tax. The results of the Valves & Controls business have been presented as discontinued operations and the related assets and liabilities have been reclassified as held for sale for all periods presented. The Valves & Controls business was previously disclosed as a stand-alone reporting segment. Transaction costs of $56.4 million related to the sale of Valves & Controls were incurred during the year ended December 31, 2017 and were recorded within Gain (loss) from sale/impairment of discontinued operations before income taxes presented below. During 2015, we sold the remainder of our Water Transport business, of which a portion was sold in 2014, and received cash proceeds of $59.0 million . The results of the Water Transport business have been presented as discontinued operations. Operating results of discontinued operations are summarized below: Years ended December 31 In millions 2017 2016 2015 Net sales $ 450.3 $ 1,639.4 $ 1,858.6 Cost of goods sold 339.7 1,177.1 1,271.2 Gross profit 110.6 462.3 587.4 Selling, general and administrative 103.3 367.6 457.8 Research and development 5.7 18.2 21.2 Impairment of goodwill and trade names — — 554.7 Operating Income (loss) $ 1.6 $ 76.5 $ (446.3 ) Income (loss) from discontinued operations before income taxes $ 2.4 $ 77.2 $ (445.5 ) Provision for income taxes (3.0 ) 7.2 21.3 Income (loss) from discontinued operations, net of tax $ 5.4 $ 70.0 $ (466.8 ) Gain (loss) from sale / impairment of discontinued operations before income taxes $ 183.5 $ 0.6 $ (6.7 ) Provision for income taxes 2.4 — — Gain (loss) from sale / impairment of discontinued operations, net of tax $ 181.1 $ 0.6 $ (6.7 ) The carrying amounts of major classes of assets and liabilities that were classified as held for sale on the Consolidated Balance Sheets were as follows: December 31 In millions 2017 2016 Accounts and notes receivable, net $ — $ 365.4 Inventories — 491.5 Other current assets — 35.0 Current assets held for sale $ — $ 891.9 Property, plant and equipment, net $ — $ 361.5 Goodwill — 996.4 Intangibles, net — 703.5 Asbestos-related insurance receivable — 108.5 Other non-current assets — 123.0 Non-current assets held for sale $ — $ 2,292.9 Accounts payable $ — $ 151.4 Employee compensation and benefits — 61.5 Other current liabilities — 143.3 Current liabilities held for sale $ — $ 356.2 Pension and other post-retirement compensation and benefits $ — $ 32.2 Deferred tax liabilities — 162.8 Asbestos-related liabilities — 228.3 Other non-current liabilities — 82.6 Non-current liabilities held for sale $ — $ 505.9

Earnings (Loss) Per Share

Earnings (Loss) Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share Basic and diluted earnings (loss) per share were calculated as follows: Years ended December 31 In millions, except per share data 2017 2016 2015 Net income (loss) $ 666.5 $ 522.2 $ (76.4 ) Net income from continuing operations $ 480.0 $ 451.6 $ 397.1 Weighted average ordinary shares outstanding Basic 181.7 181.3 180.3 Dilutive impact of stock options and restricted stock awards 2.0 1.8 2.3 Diluted 183.7 183.1 182.6 Earnings (loss) per ordinary share Basic Continuing operations $ 2.64 $ 2.49 $ 2.20 Discontinued operations 1.03 0.39 (2.62 ) Basic earnings (loss) per ordinary share $ 3.67 $ 2.88 $ (0.42 ) Diluted Continuing operations $ 2.61 $ 2.47 $ 2.17 Discontinued operations 1.02 0.38 (2.59 ) Diluted earnings (loss) per ordinary share $ 3.63 $ 2.85 $ (0.42 ) Anti-dilutive stock options excluded from the calculation of diluted earnings per share 1.8 1.2 1.3

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During 2017 , 2016 and 2015 , we initiated and continued execution of certain business restructuring initiatives aimed at reducing our fixed cost structure and realigning our business, specifically in 2017 as part of the contemplation of the Proposed Separation. The 2017 initiatives included a reduction in hourly and salaried headcount of approximately 500 employees, which included 250 in Water and 250 in Electrical. The 2016 initiatives included the reduction in hourly and salaried headcount of approximately 650 employees, which included 300 in Water and 350 in Electrical. The 2015 initiatives included the reduction in hourly and salaried headcount of approximately 500 employees, which included 300 in Water and 200 in Electrical. Restructuring related costs included in Selling, general and administrative expenses in the Consolidated Statements of Operations and Comprehensive Income (Loss) included costs for severance and other restructuring costs as follows: Years ended December 31 In millions 2017 2016 2015 Severance and related costs $ 57.1 $ 24.5 $ 34.5 Other 1.6 — 6.8 Total restructuring costs $ 58.7 $ 24.5 $ 41.3 Other restructuring costs primarily consist of asset impairment and various contract termination costs. Restructuring costs by reportable segment were as follows: Years ended December 31 In millions 2017 2016 2015 Water $ 23.6 $ 10.5 $ 17.4 Electrical 16.8 12.3 15.7 Other 18.3 1.7 8.2 Consolidated $ 58.7 $ 24.5 $ 41.3 Activity related to accrued severance and related costs recorded in Other current liabilities in the Consolidated Balance Sheets is summarized as follows: Years ended December 31 In millions 2017 2016 Beginning balance $ 25.4 $ 37.1 Costs incurred 57.1 24.5 Cash payments and other (42.7 ) (36.2 ) Ending balance $ 39.8 $ 25.4

Goodwill and Other Identifiable

Goodwill and Other Identifiable Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Identifiable Intangible Assets	Goodwill and Other Identifiable Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 by reportable segment were as follows: In millions December 31, 2016 Acquisitions/ Foreign currency December 31, 2017 Water $ 1,994.6 $ 27.3 $ 91.0 $ 2,112.9 Electrical 2,222.8 5.3 10.1 2,238.2 Total goodwill $ 4,217.4 $ 32.6 $ 101.1 $ 4,351.1 In millions December 31, 2015 Acquisitions/ Purchase accounting adjustments Foreign currency December 31, 2016 Water $ 2,003.8 $ 20.8 $ — $ (30.0 ) $ 1,994.6 Electrical 2,255.2 — (30.9 ) (1.5 ) 2,222.8 Total goodwill $ 4,259.0 $ 20.8 $ (30.9 ) $ (31.5 ) $ 4,217.4 Accumulated goodwill impairment losses were $200.5 million as of December 31, 2017 and 2016 . Identifiable intangible assets consisted of the following at December 31: 2017 2016 In millions Cost Accumulated amortization Net Cost Accumulated amortization Net Definite-life intangibles Customer relationships $ 1,513.9 $ (437.5 ) $ 1,076.4 $ 1,478.0 $ (346.7 ) $ 1,131.3 Trade names 1.5 (1.4 ) 0.1 1.8 (1.4 ) 0.4 Proprietary technology and patents 131.9 (94.2 ) 37.7 141.3 (100.3 ) 41.0 Total finite-life intangibles 1,647.3 (533.1 ) 1,114.2 1,621.1 (448.4 ) 1,172.7 Indefinite-life intangibles Trade names 444.2 — 444.2 459.1 — 459.1 Total intangibles $ 2,091.5 $ (533.1 ) $ 1,558.4 $ 2,080.2 $ (448.4 ) $ 1,631.8 Identifiable intangible asset amortization expense in 2017 , 2016 and 2015 was $97.7 million , $96.4 million and $68.1 million , respectively. In 2017 , we recorded an impairment charge for trade name intangible assets of $25.2 million in Water and Electrical. In 2016 , we recorded an impairment charge for trade name intangible assets of $13.3 million in Electrical. Estimated future amortization expense for identifiable intangible assets during the next five years is as follows: In millions 2018 2019 2020 2021 2022 Estimated amortization expense $ 96.3 $ 89.2 $ 84.0 $ 77.5 $ 70.0

Supplemental Balance Sheet Info

Supplemental Balance Sheet Information	12 Months Ended
	Dec. 31, 2017
Disclosure Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information	Supplemental Balance Sheet Information December 31 In millions 2017 2016 Inventories Raw materials and supplies $ 255.1 $ 223.5 Work-in-process 83.0 67.3 Finished goods 242.9 233.4 Total inventories $ 581.0 $ 524.2 Other current assets Cost in excess of billings $ 121.4 $ 107.7 Prepaid expenses 80.7 68.7 Prepaid income taxes 15.3 67.2 Other current assets 5.5 9.8 Total other current assets $ 222.9 $ 253.4 Property, plant and equipment, net Land and land improvements $ 72.6 $ 66.2 Buildings and leasehold improvements 354.5 335.0 Machinery and equipment 1,011.6 932.5 Construction in progress 35.1 68.6 Total property, plant and equipment 1,473.8 1,402.3 Accumulated depreciation and amortization 928.3 863.7 Total property, plant and equipment, net $ 545.5 $ 538.6 Other non-current assets Prepaid income taxes $ 254.3 $ — Deferred income taxes 43.0 39.0 Deferred compensation plan assets 49.4 47.9 Other non-current assets 83.2 95.2 Total other non-current assets $ 429.9 $ 182.1 Other current liabilities Dividends payable $ 63.1 $ 61.8 Accrued warranty 41.0 38.9 Accrued rebates 92.7 78.2 Billings in excess of cost 29.9 22.5 Income taxes payable 31.1 87.3 Accrued restructuring 39.8 25.4 Other current liabilities 219.5 197.4 Total other current liabilities $ 517.1 $ 511.5 Other non-current liabilities Income taxes payable $ 92.7 $ 36.1 Self-insurance liabilities 48.3 49.8 Deferred compensation plan liabilities 49.4 47.9 Foreign currency contract liabilities 47.2 5.4 Other non-current liabilities 37.8 22.8 Total other non-current liabilities $ 275.4 $ 162.0

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Years ended December 31 In millions 2017 2016 2015 Cash paid for interest, net $ 107.2 $ 143.4 $ 76.9 Cash paid for income taxes, net 362.1 145.1 182.8

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Components of AOCI consist of the following: December 31 In millions 2017 2016 Cumulative translation adjustments $ (221.4 ) $ (718.9 ) Change in market value of derivative financial instruments, net of tax (22.0 ) (17.4 ) Accumulated other comprehensive loss $ (243.4 ) $ (736.3 )

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Debt and the average interest rates on debt outstanding were as follows: In millions Average Maturity year December 31 December 31, 2017 2017 2016 Commercial paper 2.340% 2019 $ 34.0 $ 398.7 Revolving credit facilities 3.064% 2019 28.4 576.8 Senior notes - fixed rate (1) 1.875% 2017 — 350.0 Senior notes - fixed rate (1) 2.900% 2018 255.3 500.0 Senior notes - fixed rate (1) 2.650% 2019 250.0 250.0 Senior notes - fixed rate - Euro (1) 2.450% 2019 594.4 520.7 Senior notes - fixed rate (1) 3.625% 2020 74.0 400.0 Senior notes - fixed rate (1) 5.000% 2021 103.8 500.0 Senior notes - fixed rate (1) 3.150% 2022 88.3 550.0 Senior notes - fixed rate (1) 4.650% 2025 19.3 250.0 Other N/A N/A — 0.8 Unamortized issuance costs and discounts N/A N/A (6.8 ) (17.8 ) Total debt 1,440.7 4,279.2 Less: Current maturities and short-term borrowings — (0.8 ) Long-term debt $ 1,440.7 $ 4,278.4 (1) Senior notes guaranteed as to payment by Pentair plc and PISG ("the Notes") In October 2014, Pentair plc, Pentair Investments Switzerland GmbH ("PISG"), Pentair Finance S.à r.l. ("PFSA") and Pentair, Inc. entered into an amended and restated credit agreement (the "Credit Facility"), with Pentair plc and PISG as guarantors and PFSA and Pentair, Inc. as borrowers. The Credit Facility had a maximum aggregate availability of $2,100.0 million and a maturity date of October 3, 2019. Borrowings under the Credit Facility generally bear interest at a variable rate equal to the London Interbank Offered Rate ("LIBOR") plus a specified margin based upon PFSA's credit ratings. PFSA must pay a facility fee ranging from 9.0 to 25.0 basis points per annum (based upon PFSA's credit ratings) on the amount of each lender's commitment and letter of credit fee for each letter of credit issued and outstanding under the Credit Facility. In August 2015, Pentair plc, PISG and PFSA entered into a First Amendment to the Credit Facility (the "First Amendment"), which, among other things, increased the Leverage Ratio (as defined below). In September 2015, Pentair plc, PISG and PFSA entered into a Second Amendment to the Credit Facility (the "Second Amendment"), which, among other things, increased the maximum aggregate availability to $2,500.0 million . Additionally, in September 2016, Pentair plc, PISG and PFSA entered into a Third Amendment to the Credit Facility (the "Third Amendment," and collectively with the First Amendment and Second Amendment, the "Amendments"), which, among other things, increased the Leverage Ratio to the amounts specified below, and amended the definition of EBITDA to include earnings from discontinued operations subject to a sale agreement until such disposition actually occurs. In May 2017, we repurchased aggregate principal of certain series of outstanding notes totaling $1,659.3 million . All costs associated with the repurchases were recorded as Loss on early extinguishment of debt, including $6.5 million of unamortized deferred financing costs. PFSA is authorized to sell short-term commercial paper notes to the extent availability exists under the Credit Facility. PFSA uses the Credit Facility as back-up liquidity to support 100% of commercial paper outstanding. As of December 31, 2017 and 2016 , we had $34.0 million and $398.7 million , respectively, of commercial paper outstanding, all of which was classified as long-term as we have the intent and ability to refinance such obligations on a long-term basis under the Credit Facility. Our debt agreements contain certain financial covenants, the most restrictive of which are in the Credit Facility (as updated for the Amendments), including that we may not permit (i) the ratio of our consolidated debt plus synthetic lease obligations to our consolidated net income (excluding, among other things, non-cash gains and losses) before interest, taxes, depreciation, amortization, non-cash share-based compensation expense, up to a lifetime maximum $25.0 million of costs, fees and expenses incurred in connection with certain acquisitions, investments, dispositions and the issuance, repayment or refinancing of debt, ("EBITDA") for the four consecutive fiscal quarters then ended (the "Leverage Ratio") to exceed 3.50 to 1.00 as of the last day of the period of four consecutive fiscal quarters and (ii) the ratio of our EBITDA for the four consecutive fiscal quarters then ended to our consolidated interest expense, including consolidated yield or discount accrued as to outstanding securitization obligations (if any), for the same period to be less than 3.00 to 1.00 as of the end of each fiscal quarter. For purposes of the Leverage Ratio, the Credit Facility provides for the calculation of EBITDA giving pro forma effect to certain acquisitions, divestitures and liquidations during the period to which such calculation relates. As of December 31, 2017 , we were in compliance with all financial covenants in our debt agreements. Total availability under the Credit Facility was $2,437.6 million as of December 31, 2017 , which was limited to $1,897.5 million by the Leverage Ratio in the Credit Facility's credit agreement. In addition to the Credit Facility, we have various other credit facilities with an aggregate availability of $30.0 million , of which there were no outstanding borrowings at December 31, 2017 . Borrowings under these credit facilities bear interest at variable rates. We have $255.3 million of fixed rate senior notes maturing in September 2018 . We classified this debt as long-term as of December 31, 2017 as we have the intent and ability to refinance such obligation on a long-term basis under the Credit Facility. Debt outstanding, excluding unamortized issuance costs and discounts , at December 31, 2017 matures on a calendar year basis as follows: In millions 2018 2019 2020 2021 2022 Thereafter Total Contractual debt obligation maturities $ — $ 1,162.1 $ 74.0 $ 103.8 $ 88.3 $ 19.3 $ 1,447.5

Derivatives and Financial Instr

Derivatives and Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives and Financial Instruments	Derivatives and Financial Instruments Derivative financial instruments We are exposed to market risk related to changes in foreign currency exchange rates. To manage the volatility related to this exposure, we periodically enter into a variety of derivative financial instruments. Our objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows associated with changes in foreign currency rates. The derivative contracts contain credit risk to the extent that our bank counterparties may be unable to meet the terms of the agreements. The amount of such credit risk is generally limited to the unrealized gains, if any, in such contracts. Such risk is minimized by limiting those counterparties to major financial institutions of high credit quality. Foreign currency contracts We conduct business in various locations throughout the world and are subject to market risk due to changes in the value of foreign currencies in relation to our reporting currency, the U.S. dollar. We manage our economic and transaction exposure to certain market-based risks through the use of foreign currency derivative financial instruments. Our objective in holding these derivatives is to reduce the volatility of net earnings and cash flows associated with changes in foreign currency exchange rates. The majority of our foreign currency contracts have an original maturity date of less than one year. The derivative contracts contain credit risk to the extent that our bank counterparties may be unable to meet the terms of the agreements. The amount of such credit risk is generally limited to the unrealized gains, if any, in such contracts. Such risk is minimized by limiting those counterparties to major financial institutions of high credit quality. At December 31, 2017 and 2016 , we had outstanding foreign currency derivative contracts with gross notional U.S. dollar equivalent amounts of $481.4 million and $475.6 million , respectively. The impact of these contracts on the Consolidated Statements of Operations and Comprehensive Income (Loss) was not material for any period presented. Gains or losses on foreign currency contracts designated as hedges are reclassified out of AOCI and into Selling, general and administrative expense in the Consolidated Statements of Operations and Comprehensive Income (Loss) when the hedged item affects earnings. Such reclassifications during 2017 , 2016 and 2015 were not material. Net investment hedge We have net investments in foreign subsidiaries that are subject to changes in the foreign currency exchange rate. In September 2015, we designated the €500 million 2.45% Senior Notes due 2019 (the "2019 Euro Notes") as a net investment hedge for a portion of our net investment in our Euro denominated subsidiaries . The gains/losses on the 2019 Euro Notes have been included as a component of the cumulative translation adjustment account within AOCI. As of December 31, 2017 and 2016 , we had a deferred foreign currency loss of $29.6 million and a gain of $44.2 million , respectively, in AOCI associated with the net investment hedge activity. Fair value measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities measured at fair value are classified using the following hierarchy, which is based upon the transparency of inputs to the valuation as of the measurement date: Level 1: Valuation is based on observable inputs such as quoted market prices (unadjusted) for identical assets or liabilities in active markets. Level 2: Valuation is based on inputs such as quoted market prices for similar assets or liabilities in active markets or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3: Valuation is based upon other unobservable inputs that are significant to the fair value measurement. In making fair value measurements, observable market data must be used when available. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Fair value of financial instruments The following methods were used to estimate the fair values of each class of financial instrument: • short-term financial instruments (cash and cash equivalents, accounts and notes receivable, accounts and notes payable and variable-rate debt) — recorded amount approximates fair value because of the short maturity period; • long-term fixed-rate debt, including current maturities — fair value is based on market quotes available for issuance of debt with similar terms, which are inputs that are classified as Level 2 in the valuation hierarchy defined by the accounting guidance; • foreign currency contract agreements — fair values are determined through the use of models that consider various assumptions, including time value, yield curves, as well as other relevant economic measures, which are inputs that are classified as Level 2 in the valuation hierarchy defined by the accounting guidance; and • deferred compensation plan assets (mutual funds, common/collective trusts and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees) — fair value of mutual funds and cash equivalents are based on quoted market prices in active markets that are classified as Level 1 in the valuation hierarchy defined by the accounting guidance; fair value of common/collective trusts are based on observable inputs that are classified as Level 2 in the valuation hierarchy defined by the accounting guidance. The recorded amounts and estimated fair values of total debt, excluding unamortized issuance costs and discounts , at December 31 were as follows: 2017 2016 In millions Recorded Fair Value Recorded Fair Value Variable rate debt $ 62.4 $ 62.4 $ 976.3 $ 976.3 Fixed rate debt 1,385.1 1,424.0 3,320.7 3,427.1 Total debt $ 1,447.5 $ 1,486.4 $ 4,297.0 $ 4,403.4 Financial assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows: Recurring fair value measurements December 31, 2017 In millions Level 1 Level 2 Level 3 Total Foreign currency contract assets $ — $ 0.6 $ — $ 0.6 Foreign currency contract liabilities — (47.2 ) — (47.2 ) Deferred compensation plan assets 42.8 6.6 — 49.4 Total recurring fair value measurements $ 42.8 $ (40.0 ) $ — $ 2.8 Nonrecurring fair value measurements (1) Recurring fair value measurements December 31, 2016 In millions Level 1 Level 2 Level 3 Total Foreign currency contract assets $ — $ 5.5 $ — $ 5.5 Foreign currency contract liabilities — (5.4 ) — (5.4 ) Deferred compensation plan assets 41.6 6.3 — 47.9 Total recurring fair value measurements $ 41.6 $ 6.4 $ — $ 48.0 Nonrecurring fair value measurements (1) (1) During the fourth quarter of 2017, we completed our annual intangible assets impairment review. As a result, we recorded a pre-tax non-cash impairment charge of $25.2 million for trade name intangibles in 2017. The impairment charge reduced the total carrying value of the impacted trade name intangibles to $27.0 million . During the fourth quarter of 2016, we completed our annual intangible assets impairment review. As a result, we recorded a pre-tax non-cash impairment charge of $13.3 million for a trade name intangible in 2016. The impairment charge reduced the carrying value of the impacted trade name intangible to zero . The fair value of trade names is measured using the relief-from-royalty method. This method assumes the trade name has value to the extent that the owner is relieved of the obligation to pay royalties for the benefits received from them. This method requires us to estimate the future revenue for the related brands, the appropriate royalty rate and the weighted average cost of capital.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income from continuing operations before income taxes consisted of the following: Years ended December 31 In millions 2017 2016 2015 Federal (1) $ (32.8 ) $ (25.6 ) $ (21.8 ) International (2) 522.0 586.6 534.3 Income from continuing operations before income taxes $ 489.2 $ 561.0 $ 512.5 (1) "Federal" reflects United Kingdom ("U.K.") income from continuing operations before income taxes. (2) "International" reflects non-U.K. income from continuing operations before income taxes. The provision for income taxes consisted of the following: Years ended December 31 In millions 2017 2016 2015 Currently payable Federal (1) $ 0.5 $ (0.1 ) $ — International (2) 183.8 125.6 117.7 Total current taxes 184.3 125.5 117.7 Deferred Federal (1) — (0.4 ) 1.2 International (2) (175.1 ) (15.7 ) (3.5 ) Total deferred taxes (175.1 ) (16.1 ) (2.3 ) Total provision for income taxes $ 9.2 $ 109.4 $ 115.4 (1) "Federal" represents U.K. taxes. (2) "International" represents non-U.K. taxes. Reconciliations of the federal statutory income tax rate to our effective tax rate were as follows: Years ended December 31 Percentages 2017 2016 2015 Federal statutory income tax rate (1) 19.3 20.0 20.3 Tax effect of international operations (2) (11.3 ) (11.8 ) (6.5 ) Change in valuation allowances 8.0 9.7 6.9 Withholding taxes 0.4 0.9 0.6 Interest limitations 0.6 0.6 0.7 Non-deductible transaction costs 0.7 0.1 0.5 Excess tax benefits on stock-based compensation (1.7 ) — — Tax effect of U.S. tax reform (17.3 ) — — Tax effect of early extinguishment of debt 3.2 — — Effective tax rate 1.9 19.5 22.5 (1) The statutory rate for 2017 , 2016 and 2015 reflects the U.K. statutory rate of 19.3% , 20.0% and 20.3% , respectively. (2) The tax effect of international operations consists of non-U.K. jurisdictions. Reconciliations of the beginning and ending gross unrecognized tax benefits were as follows: Years ended December 31 In millions 2017 2016 2015 Beginning balance $ 71.1 $ 45.6 $ 40.3 Gross increases for tax positions in prior periods 5.3 27.4 4.7 Gross decreases for tax positions in prior periods (5.0 ) (4.8 ) (1.5 ) Gross increases based on tax positions related to the current year 1.8 2.0 1.3 Gross decreases related to settlements with taxing authorities (35.7 ) (3.4 ) (1.9 ) Reductions due to statute expiration (2.2 ) (0.8 ) (1.4 ) Gross (decreases) increases due to currency fluctuations 1.3 (0.2 ) (2.5 ) Gross increases due to acquisitions — 5.3 6.6 Ending balance $ 36.6 $ 71.1 $ 45.6 We record gross unrecognized tax benefits in Other current liabilities and Other non-current liabilities in the Consolidated Balance Sheets. Included in the $36.6 million of total gross unrecognized tax benefits as of December 31, 2017 was $34.9 million of tax benefits that, if recognized, would impact the effective tax rate. It is reasonably possible that the gross unrecognized tax benefits as of December 31, 2017 may decrease by a range of zero to $16.9 million during 2018 , primarily as a result of the resolution of non-U.K. examinations, including U.S. federal and state examinations, and the expiration of various statutes of limitations. The $35.7 million gross decrease during 2017 for settlements with taxing authorities consists primarily of a settlement with the Internal Revenue Service ("IRS") related to the value of certain intellectual property sold from the U.S. to a non-U.S. affiliate. The decrease related to settlements with taxing authorities had no impact on our effective tax rate. Based on the outcome of these examinations, or as a result of the expiration of statute of limitations for specific jurisdictions, it is reasonably possible that certain unrecognized tax benefits for tax positions taken on previously filed tax returns will materially change from those recorded as liabilities in our financial statements. During 2017, the IRS completed their examination of the Panthro Acquisition Co. U.S. federal income tax returns for tax years ending December 31, 2012 and December 31, 2013. A number of tax periods from 2003 to present are under audit by tax authorities in various jurisdictions, including Canada, China, Germany, India, the Netherlands and New Zealand. We anticipate that several of these audits may be concluded in the foreseeable future. We record penalties and interest related to unrecognized tax benefits in Provision for income taxes and Interest expense , respectively, in the Consolidated Statements of Operations and Comprehensive Income (Loss). As of December 31, 2017 and 2016 , we have liabilities of $2.3 million and $2.4 million , respectively, for the possible payment of penalties and $9.4 million and $11.0 million , respectively, for the possible payment of interest expense, which are recorded in Other current liabilities in the Consolidated Balance Sheets. Deferred taxes arise because of different treatment between financial statement accounting and tax accounting, known as "temporary differences." We record the tax effect of these temporary differences as "deferred tax assets" (generally items that can be used as a tax deduction or credit in future periods) and "deferred tax liabilities" (generally items for which we received a tax deduction but the tax impact has not yet been recorded in the Consolidated Statements of Operations and Comprehensive Income (Loss)). Deferred taxes were recorded in the Consolidated Balance Sheets as follows: December 31 In millions 2017 2016 Other non-current assets 43.0 39.0 Deferred tax liabilities 394.8 609.5 Net deferred tax liabilities $ 351.8 $ 570.5 The tax effects of the major items recorded as deferred tax assets and liabilities were as follows: December 31 In millions 2017 2016 Deferred tax assets Accrued liabilities and reserves $ 55.2 $ 83.2 Pension and other post-retirement compensation and benefits 53.8 48.9 Employee compensation and benefits 43.5 76.6 Tax loss and credit carryforwards 811.7 391.0 Total deferred tax assets 964.2 599.7 Valuation allowance 792.4 380.8 Deferred tax assets, net of valuation allowance 171.8 218.9 Deferred tax liabilities Property, plant and equipment 16.5 23.6 Goodwill and other intangibles 484.7 733.7 Other liabilities 22.4 32.1 Total deferred tax liabilities 523.6 789.4 Net deferred tax liabilities $ 351.8 $ 570.5 Included in tax loss and credit carryforwards in the table above is a deferred tax asset of $28.7 million as of December 31, 2017 related to foreign tax credit carryover from the tax period ended December 31, 2017 and related to transition taxes. The entire amount is subject to a valuation allowance. The foreign tax credit is eligible for carryforward until the tax period ending December 31, 2027. As of December 31, 2017 , tax loss carryforwards of $4,052.9 million were available to offset future income. A valuation allowance of $762.2 million exists for deferred income tax benefits related to the tax loss carryforwards which may not be realized. The increase in tax loss carryforwards and valuation allowance from 2016 to 2017 were primarily related to internal restructuring transactions and interest expense. We believe sufficient taxable income will be generated in the respective jurisdictions to allow us to fully recover the remainder of the tax losses. The tax losses primarily relate to non-U.S. carryforwards of $3,961.0 million which are subject to varying expiration periods. Non-U.S. carryforwards of $2,253.0 million are located in jurisdictions with unlimited tax loss carryforward periods, while the remainder will begin to expire in 2018 . In addition, there were $91.9 million of state tax loss carryforwards as of December 31, 2017 , which will expire in future years through 2037 . On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. Given the significance of the Act, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. SAB 118 allows registrants to record provisional amounts during a one year “measurement period.” The measurement period is deemed to have ended earlier when the registrant has obtained, prepared, and analyzed the information necessary to finalize its accounting. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared, or analyzed. The Company has calculated its best estimate of the impact of the Act in its year end income tax provision in accordance with its understanding of the Act and guidance available as of the date of this filing and as a result has recorded a provisional income tax benefit of $84.8 million in the fourth quarter of 2017, the period in which the legislation was enacted. The provisional amount related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future was a decrease to income tax expense of $147.7 million . The remeasurement of deferred taxes requires further analysis regarding the state tax impacts of the remeasurement, the impact of the Act on the taxation of executive compensation arrangements, changes to tax capitalization provisions and other aspects of the Act that may impact our tax balances. The amount related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was an increase to income tax expense of $62.9 million . The determination of the transition tax requires additional analysis regarding the amount and composition of the company’s historical foreign earnings and foreign tax credit position, which is expected to be completed in the second half of 2018. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans Pension and other post-retirement plans We sponsor U.S. and non-U.S. defined-benefit pension and other post-retirement plans. Pension benefits are based principally on an employee's years of service and/or compensation levels near retirement. In addition, we provide certain post-retirement health care and life insurance benefits. Generally, the post-retirement health care and life insurance plans require contributions from retirees. In December 2007, we announced that we would freeze certain U.S. pension plans as of December 31, 2017. As such, employees in these U.S. pension plans will no longer earn service credits and the Company will no longer incur service cost related to these plans. In November 2017, our Board of Directors approved amendments to terminate the Pentair Salaried Plan (the "Salaried Plan"), a U.S. qualified pension plan. The Salaried Plan discontinued accruing benefits on December 31, 2017 and the termination was effective December 31, 2017. It is expected to take 18 to 24 months from the date of the approved amendment to complete the termination of the Salaried Plan. At December 31, 2017, the projected benefit obligation of the Salaried Plan was $369.0 million and the plan assets were $355.4 million . There were approximately 2,610 active participants in the Salaried Plan, of which 2,048 were either active employees or terminated vested participants who had not yet begun to receive their benefits as of December 31, 2017. The Salaried Plan participants will not be adversely affected by the plan termination. Those participants whose plan benefits are not in pay status by July 1, 2018 will be given the opportunity to elect a lump sum (or monthly annuity) during a special election window. For all participants whose Salaried Plan benefits are not paid in a lump sum, Pentair will purchase an annuity for them with an annuity provider after the special election window and after all required government approvals for the termination of the pension plan are received. The information herein relates to defined-benefit pension and other post-retirement plans of our continuing operations only. Obligations and funded status The following tables present reconciliations of plan benefit obligations, fair value of plan assets and the funded status of pension plans and other post-retirement plans as of and for the years ended December 31, 2017 and 2016 : U.S. pension plans Non-U.S. pension plans Other post-retirement plans In millions 2017 2016 2017 2016 2017 2016 Change in benefit obligations Benefit obligation beginning of year $ 413.3 $ 396.9 $ 186.8 $ 173.4 $ 36.9 $ 38.8 Service cost 10.3 11.2 8.0 6.6 0.2 0.2 Interest cost 16.3 16.4 4.2 4.1 1.3 1.5 Actuarial loss (gain) 40.0 0.9 (8.5 ) 16.8 0.2 (0.5 ) Foreign currency translation — — 23.7 (9.2 ) — — Benefits paid (16.9 ) (12.1 ) (7.0 ) (4.9 ) (3.0 ) (3.1 ) Benefit obligation end of year $ 463.0 $ 413.3 $ 207.2 $ 186.8 $ 35.6 $ 36.9 Change in plan assets Fair value of plan assets beginning of year $ 344.4 $ 327.7 $ 45.7 $ 46.6 $ — $ — Actual return on plan assets 42.4 24.6 2.1 3.0 — — Company contributions 4.6 4.2 8.2 5.8 2.9 3.1 Foreign currency translation — — 3.7 (4.8 ) — — Benefits paid (16.9 ) (12.1 ) (8.5 ) (4.9 ) (2.9 ) (3.1 ) Fair value of plan assets end of year $ 374.5 $ 344.4 $ 51.2 $ 45.7 $ — $ — Funded status Benefit obligations in excess of the fair value of plan assets $ (88.5 ) $ (68.9 ) $ (156.0 ) $ (141.1 ) $ (35.6 ) $ (36.9 ) Amounts recorded in the Consolidated Balance Sheets were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement plans In millions 2017 2016 2017 2016 2017 2016 Other non-current assets $ — $ 0.8 $ 3.8 $ 3.2 $ — $ — Current liabilities (6.0 ) (4.4 ) (3.6 ) (2.9 ) (3.1 ) (3.2 ) Non-current liabilities (82.5 ) (65.3 ) (156.2 ) (141.4 ) (32.5 ) (33.7 ) Benefit obligations in excess of the fair value of plan assets $ (88.5 ) $ (68.9 ) $ (156.0 ) $ (141.1 ) $ (35.6 ) $ (36.9 ) The accumulated benefit obligation for all defined benefit plans was $656.7 million and $585.9 million at December 31, 2017 and 2016 , respectively. Information for pension plans with an accumulated benefit obligation or projected benefit obligation in excess of plan assets as of December 31 was as follows: Projected benefit obligation exceeds the fair value of plan assets Accumulated benefit obligation exceeds the fair value of plan assets In millions 2017 2016 2017 2016 U.S. pension plans Projected benefit obligation $ 463.0 $ 87.2 $ 463.0 $ 87.2 Fair value of plan assets 374.5 17.5 374.5 17.5 Accumulated benefit obligation N/A N/A 460.3 86.3 Non-U.S. pension plans Projected benefit obligation $ 182.4 $ 165.2 $ 170.3 $ 165.2 Fair value of plan assets 22.6 20.9 11.4 20.9 Accumulated benefit obligation NA NA 160.5 155.7 Components of net periodic benefit expense for our pension plans for the years ended December 31 were as follows: U.S. pension plans Non-U.S. pension plans In millions 2017 2016 2015 2017 2016 2015 Service cost $ 10.3 $ 11.2 $ 14.0 $ 8.0 $ 6.6 $ 7.8 Interest cost 16.3 16.4 14.9 4.2 4.1 3.9 Expected return on plan assets (11.5 ) (11.4 ) (10.0 ) (1.5 ) (1.5 ) (1.6 ) Net actuarial (gain) loss 9.1 (12.4 ) (18.0 ) (7.4 ) 17.2 (2.4 ) Net periodic benefit expense $ 24.2 $ 3.8 $ 0.9 $ 3.3 $ 26.4 $ 7.7 Components of net periodic benefit expense for our other post-retirement plans for the years ended December 31 2017 , 2016 and 2015 , were not material. Assumptions Weighted-average assumptions used to determine benefit obligations as of December 31 were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement Percentages 2017 (1) 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 3.39 % 4.02 % 4.21 % 2.18 % 2.00 % 2.52 % 3.40 % 3.80 % 3.95 % Rate of compensation increase 4.00 % 4.00 % 4.00 % 2.93 % 2.91 % 2.90 % — — — (1) The benefit obligation for the Salaried Plan as of December 31, 2017 was determined using assumptions reflecting the termination of the plan. As a result, the weighted-average assumptions for U.S. pension plans as December 31, 2017 reflected in the table above do not include the Salaried Plan. Weighted-average assumptions used to determine net periodic benefit expense (income) for years ended December 31 were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement Percentages 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.02 % 4.21 % 3.63 % 2.00 % 2.52 % 2.30 % 3.80 % 3.95 % 3.60 % Expected long-term return on plan assets 4.11 % 4.28 % 3.65 % 3.02 % 3.29 % 3.57 % — — — Rate of compensation increase 4.00 % 4.00 % 4.00 % 2.91 % 2.90 % 2.89 % — — — Uncertainty in the securities markets and U.S. economy could result in investment returns less than those assumed. Should the securities markets decline or medical and prescription drug costs increase at a rate greater than assumed, we would expect increasing annual combined net pension and other post-retirement costs for the next several years. Should actual experience differ from actuarial assumptions, the projected pension benefit obligation and net pension cost and accumulated other post-retirement benefit obligation and other post-retirement benefit cost would be affected in future years. Discount rates The discount rate reflects the current rate at which the pension liabilities could be effectively settled at the end of the year based on our December 31 measurement date. The discount rate was determined by matching our expected benefit payments to payments from a stream of bonds rated AA or higher available in the marketplace, adjusted to eliminate the effects of call provisions. This produced a weighted-average discount rate for our U.S. pension plans of 3.39% , 4.02% and 4.21% in 2017 , 2016 and 2015 , respectively. The discount rates on our non-U.S. pension plans ranged from 0.50% to 3.50% , 0.50% to 4.00% and 0.50% to 4.25% in 2017 , 2016 and 2015 , respectively. There are no known or anticipated changes in our discount rate assumptions that will impact our pension expense in 2018 . Expected rates of return Our expected rates of return on U.S. pension plan assets were 4.11% , 4.28% and 3.65% for 2017 , 2016 and 2015 , respectively. The expected rates of return on non-U.S. pension plan assets ranged from 1.00% to 5.50% , 1.00% to 5.50% and 1.00% to 6.00% in 2017 , 2016 and 2015 , respectively. The expected rate of return is designed to be a long-term assumption that may be subject to considerable year-to-year variance from actual returns. In developing the expected long-term rate of return, we considered our historical returns, with consideration given to forecasted economic conditions, our asset allocations, input from external consultants and broader longer-term market indices. U.S. pension plan assets yielded returns of 12.30% , 7.50% and (3.20)% in 2017 , 2016 and 2015 , respectively. As a result of our de-risking strategy to reduce U.S. pension plan liability, we anticipate the expected rate of return on our U.S. funded pension plans will continue to be consistent with the discount rate utilized. Any difference in the expected rate and actual returns will be included with the actuarial gain or loss recorded in the fourth quarter when our plans are remeasured. Healthcare cost trend rates The assumed healthcare cost trend rates for other post-retirement plans as of December 31 were as follows: 2017 2016 Healthcare cost trend rate assumed for following year 6.6 % 7.0 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.4 % 4.4 % Year the cost trend rate reaches the ultimate trend rate 2038 2038 The assumed healthcare cost trend rates can have a significant effect on the amounts reported for healthcare plans. A one-percentage-point change in the assumed healthcare cost trend rates would have the following effects as of and for the year ended December 31, 2017 : One Percentage Point In millions Increase Decrease Increase (decrease) in annual service and interest cost $ 0.1 $ (0.1 ) Increase (decrease) in other post-retirement benefit obligations 0.7 (0.6 ) Pension plans assets Objective The primary objective of our investment strategy is to meet the pension obligation to our employees at a reasonable cost to us. This is primarily accomplished through growth of capital and safety of the funds invested. Asset allocation Our actual overall asset allocation for our U.S. and non-U.S. pension plans as compared to our investment policy goals as of December 31 was as follows: U.S. pension plans Actual Target Percentages 2017 2016 2017 2016 Fixed income 99 % 99 % 100 % 100 % Alternative 1 % 1 % — % — % Non-U.S. pension plans Actual Target Percentages 2017 2016 2017 2016 Equity securities 22 % 23 % 24 % 23 % Fixed income 53 % 46 % 51 % 48 % Alternative 22 % 26 % 23 % 27 % Cash 3 % 5 % 2 % 2 % Fair value measurement The fair values of our pension plan assets and their respective levels in the fair value hierarchy as of December 31, 2017 and December 31, 2016 were as follows: December 31, 2017 In millions Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 2.8 $ — $ 2.8 Fixed income: Corporate and non U.S. government — 289.5 — 289.5 U.S. treasuries — 43.2 — 43.2 Mortgage-backed securities — 3.3 — 3.3 Other — 63.1 — 63.1 Global equity securities: Small cap equity — 1.2 — 1.2 International equity — 10.2 — 10.2 Other investments — 11.3 1.1 12.4 Total fair value of plan assets $ — $ 424.6 $ 1.1 $ 425.7 December 31, 2016 In millions Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 3.4 $ — $ 3.4 Fixed income: Corporate and non U.S. government — 290.5 — 290.5 U.S. treasuries — 30.5 — 30.5 Mortgage-backed securities — 4.5 — 4.5 Other — 37.0 — 37.0 Global equity securities: Large cap equity — 2.2 — 2.2 International equity — 8.3 — 8.3 Other investments — 11.7 2.0 13.7 Total fair value of plan assets $ — $ 388.1 $ 2.0 $ 390.1 Valuation methodologies used for investments measured at fair value were as follows: • Cash and cash equivalents: Cash consists of cash held in bank accounts and was classified as Level 1. Cash equivalents consist of investments in commingled funds valued based on observable market data. Such investments were classified as Level 2. • Fixed income: Investments in corporate bonds, government securities, mortgages and asset backed securities were valued based upon quoted market prices for similar securities and other observable market data. Investments in commingled funds were generally valued at the net asset value of units held at the end of the period based upon the value of the underlying investments as determined by quoted market prices or by a pricing service. Such investments were classified as Level 2. • Global equity securities: Investments in commingled funds were valued at the net asset value of units held at the end of the period based upon the value of the underlying investments as determined by quoted market prices or by a pricing service. Such investments were classified as Level 2. • Other investments: Other investments include investments in commingled funds with diversified investment strategies. Investments in commingled funds that were valued at the net asset value of units held at the end of the period based upon the value of the underlying investments as determined by quoted market prices or by a pricing service were classified as Level 2. Investments in commingled funds that were valued based on unobservable inputs due to liquidation restrictions were classified as Level 3. Activity for our Level 3 pension plan assets held during the years ended December 31, 2017 and 2016 was not material. Cash flows Contributions Pension contributions totaled $12.8 million and $10.0 million in 2017 and 2016 , respectively. Our 2018 pension contributions are expected to be approximately $18.0 million to $21.0 million . The 2018 expected contributions will equal or exceed our minimum funding requirements. Estimated future benefit payments The following benefit payments, which reflect expected future service or payout from termination, as appropriate, are expected to be paid by the plans for the years ended December 31 as follows: In millions U.S. pension plans Non-U.S. pension plans Other post- retirement plans 2018 $ 203.7 $ 5.2 $ 3.1 2019 178.3 5.8 3.0 2020 6.7 5.5 2.9 2021 6.7 6.1 2.8 2022 6.8 6.3 2.7 Thereafter 33.6 41.1 11.7 Savings plan We have a 401(k) plan (the "401(k) plan") with an employee share ownership ("ESOP") bonus component, which covers certain union and all non-union U.S. employees who met certain age requirements. Under the 401(k) plan, eligible U.S. employees could voluntarily contribute a percentage of their eligible compensation. We matched contributions made by employees who met certain eligibility and service requirements. During 2017, 2016 and 2015, our matching contribution was 100% of eligible employee contributions for the first 1% of eligible compensation and 50% of the next 5% of eligible compensation. In addition to the matching contribution, all employees who met certain service requirements received a discretionary ESOP contribution equal to 1.5% of annual eligible compensation. As of January 1, 2018, the 401(k) company match contribution was changed to a dollar-for-dollar ( 100% ) matching contribution on up to 5% of employee eligible earnings, contributed as before-tax contributions. This change will replace the ESOP component discussed above and offers the same 5% total company match. Our combined expense for the 401(k) plan and the ESOP was $27.9 million , $27.1 million and $26.5 million in 2017 , 2016 and 2015 , respectively. Other retirement compensation Total other accrued retirement compensation, primarily related to deferred compensation and supplemental retirement plans, was $62.9 million and $61.0 million as of December 31, 2017 and 2016 , respectively, and is included in Pension and other post-retirement compensation and benefits and Other non-current liabilities in the Consolidated Balance Sheets.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders' Equity Authorized shares Our authorized share capital consists of 426.0 million ordinary shares with a par value of $0.01 per share. Ordinary shares held in treasury In August 2015, we canceled all of our ordinary shares held in treasury. At the time of the cancellation, we held $19.1 million ordinary shares in treasury at a cost of $1.2 billion . Share repurchases In December 2014, the Board of Directors authorized the repurchase of our ordinary shares up to a maximum dollar limit of $1.0 billion . The authorization expires on December 31, 2019 . In December 2015, we repurchased 3.1 million of our ordinary shares for $200 million under the 2014 authorization. During the year ended December 31, 2017 , we repurchased 3.0 million of our ordinary shares for $200.0 million under the 2014 authorization. We have $600.0 million remaining availability for repurchases under the 2014 authorization. Dividends payable On December 5, 2017, the Board of Directors declared a quarterly cash dividend of $0.35 that was paid on February 9, 2018 to shareholders of record at the close of business on January 26, 2018. Additionally, the Board of Directors approved a plan to increase the 2018 annual cash dividend to $1.40 , which is intended to be paid in four quarterly installments. As a result, the balance of dividends payable included in Other current liabilities on our Consolidated Balance Sheets was $63.1 million at December 31, 2017 . Dividends paid per ordinary share were $1.38 , $1.34 and $1.28 for the years ended December 31, 2017 , 2016 and 2015 , respectively.

Share Plans

Share Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Plans	Share Plans Share-based compensation expense Total share-based compensation expense for 2017 , 2016 and 2015 was as follows: December 31 In millions 2017 2016 2015 Restricted stock units $ 17.5 $ 17.3 $ 21.6 Stock options 10.5 10.4 11.4 Performance share units 11.6 6.5 — Total share-based compensation expense $ 39.6 $ 34.2 $ 33.0 Share incentive plans In 2012, our Board of Directors, and Tyco International Ltd. ("Tyco") as our sole shareholder at the time, approved the Pentair plc 2012 Stock and Incentive Plan (the "2012 Plan"). The 2012 Plan became effective on September 28, 2012 and authorizes the issuance of 9.0 million of our ordinary shares. The shares may be issued as new shares or from shares held in treasury. Prior to the cancellation of our shares held in treasury in August 2015, our practice was to settle equity-based awards from shares held in treasury. Subsequent to the cancellation, our practice is to settle equity-based awards by issuing new shares. The 2012 Plan terminates in September 2022. The 2012 Plan allows for the granting to our officers, directors, employees and consultants of non-qualified stock options, incentive stock options, stock appreciation rights, performance shares, performance units, restricted shares, restricted stock units, deferred stock rights, annual incentive awards, dividend equivalent units and other equity-based awards. The 2012 Plan is administered by our compensation committee (the "Committee"), which is made up of independent members of our Board of Directors. Employees eligible to receive awards under the 2012 Plan are managerial, administrative or other key employees who are in a position to make a material contribution to the continued profitable growth and long-term success of our company. The Committee has the authority to select the recipients of awards, determine the type and size of awards, establish certain terms and conditions of award grants and take certain other actions as permitted under the 2012 Plan. The 2012 Plan prohibits the Committee from re-pricing awards or canceling and reissuing awards at lower prices. The 2008 Omnibus Stock Incentive Plan as Amended and Restated (the "2008 Plan") terminated in 2012. Prior grants of restricted stock units and stock options made under the 2008 Plan and earlier stock incentive plans outstanding at the time of termination were converted into equity-based awards with respect to our ordinary shares and were assumed by us on the terms in effect at the time of grant and are outstanding under the 2012 Plan. Non-qualified and incentive stock options Under the 2012 Plan, we may grant stock options to any eligible employee with an exercise price equal to the market value of the shares on the dates the options were granted. Options generally vest one-third each year over a three -year period commencing on the grant date and expire 10 years after the grant date. Restricted shares and restricted stock units Under the 2012 Plan, eligible employees may be awarded restricted shares or restricted stock units of our common stock. Restricted shares and restricted stock units generally vest one-third each year over a three -year period commencing on the grant date, subject to continuous employment and certain other conditions. Restricted shares and restricted stock units are valued at market value on the date of grant and are expensed over the vesting period. Stock appreciation rights, performance shares and performance units Under the 2012 Plan, the Committee is permitted to issue these awards which are generally earned over a three -year vesting period and tied to specific financial metrics. In December 2015, the Committee approved the granting of performance share units to certain employees that vest based on the satisfaction of a three-year service period and the achievement of certain performance metrics over that same period. Upon vesting, PSU holders receive dividends that accumulate during the vesting period. The fair value of these PSUs is determined based on the closing market price of the Company's ordinary shares at the date of grant. Compensation expense is recognized over the period an employee is required to provide service based on the estimated vesting of the PSUs granted. The estimated vesting of the PSUs is based on the probability of achieving certain financial performance metrics during the three year vesting period. Stock options The following table summarizes stock option activity under all plans for the year ended December 31, 2017 : Shares and intrinsic value in millions Number of shares Weighted- average exercise price Weighted- average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2017 5.7 $ 45.72 Granted 0.9 59.09 Exercised (1.2 ) 37.00 Forfeited (0.2 ) 60.03 Expired — — Outstanding as of December 31, 2017 5.2 $ 49.49 5.5 $ 113.7 Options exercisable as of December 31, 2017 3.4 $ 46.00 4.0 $ 87.5 Options expected to vest as of December 31, 2017 1.8 $ 56.13 8.3 $ 25.8 Fair value of options granted The weighted average grant date fair value of options granted under Pentair plans in 2017 , 2016 and 2015 was estimated to be $12.59 , $9.74 and $16.40 per share, respectively. The total intrinsic value of options that were exercised during 2017 , 2016 and 2015 was $34.3 million , $27.1 million and $20.8 million , respectively. At December 31, 2017 , the total unrecognized compensation cost related to stock options was $9.8 million . This cost is expected to be recognized over a weighted average period of 2.0 years . We estimated the fair value of each stock option award on the date of grant using a Black-Scholes option pricing model, modified for dividends and using the following weighted average assumptions: December 31 2017 2016 2015 Risk-free interest rate 1.65 % 1.56 % 1.60 % Expected dividend yield 2.35 % 2.49 % 1.97 % Expected share price volatility 26.9 % 27.3 % 30.4 % Expected term (years) 6.3 5.9 6.0 These estimates require us to make assumptions based on historical results, observance of trends in our share price, changes in option exercise behavior, future expectations and other relevant factors. If other assumptions had been used, share-based compensation expense, as calculated and recorded under the accounting guidance, could have been affected. We based the expected life assumption on historical experience as well as the terms and vesting periods of the options granted. For purposes of determining expected volatility, we considered a rolling average of historical volatility measured over a period approximately equal to the expected option term. The risk-free rate for periods that coincide with the expected life of the options is based on the U.S. Treasury Department yield curve in effect at the time of grant. Cash received from option exercises for the years ended December 31, 2017 , 2016 and 2015 was $46.0 million , $31.6 million and $28.7 million , respectively. The actual tax benefit realized for the tax deductions from option exercises totaled $7.8 million , $5.5 million and $4.8 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Restricted stock units The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2017 : Shares in millions Number of shares Weighted average grant date fair value Outstanding as of January 1, 2017 0.7 $ 55.31 Granted 0.4 61.27 Vested (0.4 ) 56.73 Forfeited (0.1 ) 54.35 Outstanding as of December 31, 2017 0.6 $ 57.96 As of December 31, 2017 , there was $39.6 million of unrecognized compensation cost related to restricted share compensation arrangements granted under the 2012 Plan and previous plans. That cost is expected to be recognized over a weighted-average period of 2.8 years. The total fair value of shares vested during the years ended December 31, 2017 , 2016 and 2015 , was $21.7 million , $27.2 million and $26.0 million , respectively. For the years ended December 31, 2017 and 2016 , there was no actual tax benefit realized. The actual tax benefit realized for the years ended December 31, 2015 was $2.4 million . Performance share units The following table summarizes performance share unit activity under all plans for the year ended December 31, 2017 : Shares in millions Number of shares Weighted average grant date fair value Outstanding as of January 1, 2017 0.3 $ 49.54 Granted 0.2 58.40 Vested — — Forfeited — — Outstanding as of December 31, 2017 0.5 $ 53.56 The expense recognized each period is dependent upon our estimate of the number of shares that will ultimately be issued. As of December 31, 2017 , there was $10.5 million of unrecognized compensation cost related to performance share compensation arrangements granted under the 2012 Plan and previous plans. That cost is expected to be recognized over a weighted-average period of 1.6 years. There were no actual tax benefits realized related to performance share compensation arrangements for the year ended December 31, 2017 .

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information We classify our operations into the following business segments based primarily on types of products offered and markets served: • Water — The Water segment designs, manufactures, markets and services innovative water solutions for the filtration, separation, flow and water management challenges in agriculture, foodservice, food and beverage processing, swimming pools, water supply and disposal and a variety of industrial applications. • Electrical — The Electrical segment designs, manufactures, markets, installs and services high performance products and solutions that connect and protect some of the world's most sensitive equipment, buildings, and critical processes. • Other — Other is primarily composed of unallocated corporate expenses, our captive insurance subsidiary and intermediate finance companies. The accounting policies of our reporting segments are the same as those described in the summary of significant accounting policies. We evaluate performance based on the net sales and segment income (loss) and use a variety of ratios to measure performance of our reporting segments. These results are not necessarily indicative of the results of operations that would have occurred had each segment been an independent, stand-alone entity during the periods presented. Segment income (loss) represents equity income of unconsolidated subsidiaries and operating income exclusive of intangible amortization, certain acquisition related expenses, costs of restructuring activities, "mark-to-market" gain/loss for pension and other post-retirement plans, impairments and other unusual non-operating items. Financial information by reportable segment is included in the following summary: 2017 2016 2015 2017 2016 2015 In millions Net sales Segment income (loss) Water $ 2,844.4 $ 2,777.7 $ 2,808.3 $ 546.0 $ 494.0 $ 469.0 Electrical 2,097.9 2,116.0 1,809.3 447.0 447.2 395.0 Other (5.8 ) (3.7 ) (1.2 ) (95.8 ) (101.7 ) (108.8 ) Consolidated $ 4,936.5 $ 4,890.0 $ 4,616.4 $ 897.2 $ 839.5 $ 755.2 2017 2016 2015 2017 2016 2015 In millions Identifiable assets (1) Depreciation Water $ 3,667.1 $ 3,465.5 $ 3,624.5 $ 45.6 $ 46.8 $ 45.3 Electrical 4,634.1 4,419.3 4,488.4 34.3 31.6 27.6 Other 332.5 3,650.0 3,720.6 5.3 6.2 8.3 Consolidated $ 8,633.7 $ 11,534.8 $ 11,833.5 $ 85.2 $ 84.6 $ 81.2 2017 2016 2015 In millions Capital expenditures Water $ 36.1 $ 40.8 $ 41.5 Electrical 31.8 74.5 47.4 Other 3.0 2.5 2.4 Consolidated $ 70.9 $ 117.8 $ 91.3 (1) All cash and cash equivalents and assets held for sale are included in "Other." The following table presents a reconciliation of consolidated segment income to consolidated i ncome from continuing operations before income taxes: In millions 2017 2016 2015 Segment income $ 897.2 $ 839.5 $ 755.2 Deal related costs and expenses — — (14.3 ) Inventory step-up — — (35.7 ) Restructuring and other (30.7 ) (20.6 ) (42.5 ) Separation costs (53.1 ) — — Intangible amortization (97.7 ) (96.4 ) (68.1 ) Pension and other post-retirement mark-to-market (loss) gain (1.6 ) (4.2 ) 23.0 Trade name and other impairment (32.0 ) (13.3 ) — Loss on sale of businesses (4.2 ) (3.9 ) (3.2 ) Loss on early extinguishment of debt (101.4 ) — — Interest expense, net (87.3 ) (140.1 ) (101.9 ) Income from continuing operations before income taxes $ 489.2 $ 561.0 $ 512.5 The following tables present certain geographic information by region: 2017 2016 2015 2017 2016 2015 In millions Net sales Long-lived assets U.S. $ 2,973.7 $ 2,897.1 $ 2,634.0 $ 301.4 $ 309.5 $ 285.9 Western Europe 827.2 796.0 727.6 61.7 138.6 150.7 Developing (1) 723.7 704.0 731.6 157.1 65.2 60.3 Other Developed (2) 411.9 492.9 523.2 25.3 25.3 42.9 Consolidated $ 4,936.5 $ 4,890.0 $ 4,616.4 $ 545.5 $ 538.6 $ 539.8 (1) - Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia. (2) - Other Developed includes Australia, Canada and Japan. Net sales are based on the geographic destination of the sale. Long-lived assets represent property, plant and equipment, net of related depreciation. Net sales shipped to and long-lived assets held in Ireland for each year presented above were not material. We offer a broad array of products and systems to multiple markets and customers for which we do not have the information systems to track revenues by primary product category. However, our net sales by segment are representative of our sales by major product category. We sell our products through various distribution channels including wholesale and retail distributors, original equipment manufacturers and home centers. No customer accounted for more than 10% of net sales in 2017 , 2016 , or 2015 .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating lease commitments Net rental expense under operating leases was as follows: Years ended December 31 In millions 2017 2016 2015 Gross rental expense $ 40.4 $ 37.5 $ 26.4 Sublease rental income (0.3 ) (0.7 ) (0.4 ) Net rental expense $ 40.1 $ 36.8 $ 26.0 Future minimum lease commitments under non-cancelable operating leases, principally related to facilities, machinery, equipment and vehicles as of December 31, 2017 were as follows: In millions 2018 2019 2020 2021 2022 Thereafter Total Minimum lease payments $ 34.3 $ 29.1 $ 21.2 $ 15.6 $ 13.1 $ 15.1 $ 128.4 Minimum sublease rentals (0.3 ) — — — — — (0.3 ) Net future minimum lease commitments $ 34.0 $ 29.1 $ 21.2 $ 15.6 $ 13.1 $ 15.1 $ 128.1 Other matters In addition to the matters described above, from time to time, we are subject to disputes, administrative proceedings and other claims arising out of the normal conduct of our business. These matters generally relate to disputes arising out of the use or installation of our products, product liability litigation, personal injury claims, commercial and contract disputes and employment related matters. On the basis of information currently available to it, management does not believe that existing proceedings and claims will have a material impact on our Consolidated Financial Statements. However, litigation is unpredictable, and we could incur judgments or enter into settlements for current or future claims that could adversely affect our financial statements. Warranties and guarantees In connection with the disposition of our businesses or product lines, we may agree to indemnify purchasers for various potential liabilities relating to the sold business, such as pre-closing tax, product liability, warranty, environmental, or other obligations. The subject matter, amounts and duration of any such indemnification obligations vary for each type of liability indemnified and may vary widely from transaction to transaction. Generally, the maximum obligation under such indemnifications is not explicitly stated and as a result, the overall amount of these obligations cannot be reasonably estimated. Historically, we have not made significant payments for these indemnifications. We believe that if we were to incur a loss in any of these matters, the loss would not have a material effect on our financial position, results of operations or cash flows. We recognize, at the inception of a guarantee, a liability for the fair value of the obligation undertaken in issuing the guarantee. In connection with the disposition of the Valves & Controls business, we agreed to indemnify Emerson Electric Co. for certain pre-closing tax liabilities. During the second quarter of 2017, we recorded a liability representing the fair value of our expected future obligation for this matter. We provide service and warranty policies on our products. Liability under service and warranty policies is based upon a review of historical warranty and service claim experience. Adjustments are made to accruals as claim data and historical experience warrant. The changes in the carrying amount of service and product warranties for the years ended December 31, 2017 and 2016 were as follows: Years ended December 31 In millions 2017 2016 Beginning balance $ 38.9 $ 47.0 Service and product warranty provision 64.1 59.7 Payments (62.7 ) (67.3 ) Foreign currency translation 0.7 (0.5 ) Ending balance $ 41.0 $ 38.9 Stand-by letters of credit, bank guarantees and bonds In certain situations, Tyco guaranteed Flow Control's performance to third parties or provided financial guarantees for financial commitments of Flow Control. "Flow Control" refers to Pentair Ltd. prior to the Merger. In situations where Flow Control and Tyco were unable to obtain a release from these guarantees in connection with the spin-off of Flow Control from Tyco, we will indemnify Tyco for any losses it suffers as a result of such guarantees. In disposing of assets or businesses, we often provide representations, warranties and indemnities to cover various risks including unknown damage to the assets, environmental risks involved in the sale of real estate, liability to investigate and remediate environmental contamination at waste disposal sites and manufacturing facilities and unidentified tax liabilities and legal fees related to periods prior to disposition. We do not have the ability to reasonably estimate the potential liability due to the inchoate and unknown nature of these potential liabilities. However, we have no reason to believe that these uncertainties would have a material adverse effect on our financial position, results of operations or cash flows. In the ordinary course of business, we are required to commit to bonds, letters of credit and bank guarantees that require payments to our customers for any non-performance. The outstanding face value of these instruments fluctuates with the value of our projects in process and in our backlog. In addition, we issue financial stand-by letters of credit primarily to secure our performance to third parties under self-insurance programs. As of December 31, 2017 and 2016 , the outstanding value of bonds, letters of credit and bank guarantees totaled $201.5 million and $331.0 million , respectively.

Selected Quarterly Data (unaudi

Selected Quarterly Data (unaudited)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Data	Selected Quarterly Data (Unaudited) The following tables present 2017 and 2016 quarterly financial information: 2017 In millions, except per-share data First Quarter Second Quarter Third Quarter Fourth Quarter Full Year Net sales $ 1,183.5 $ 1,265.3 $ 1,226.8 $ 1,260.9 $ 4,936.5 Gross profit 422.3 483.2 455.3 468.3 1,829.1 Operating income 138.4 212.8 192.2 137.4 680.8 Net income from continuing operations 80.7 68.3 127.1 203.9 480.0 Income (loss) from discontinued operations, net of tax 7.1 (5.2 ) — 3.5 5.4 Gain (loss) from sale of discontinued operations, net of tax — 200.6 (1.7 ) (17.8 ) 181.1 Net income 87.8 263.7 125.4 189.6 666.5 Earnings per ordinary share (1) Basic Continuing operations $ 0.44 $ 0.38 $ 0.70 $ 1.12 $ 2.64 Discontinued operations 0.04 1.07 (0.01 ) (0.07 ) 1.03 Basic earnings per ordinary share $ 0.48 $ 1.45 $ 0.69 $ 1.05 $ 3.67 Diluted Continuing operations $ 0.44 $ 0.37 $ 0.69 $ 1.11 $ 2.61 Discontinued operations 0.04 1.06 (0.01 ) (0.07 ) 1.02 Diluted earnings per ordinary share $ 0.48 $ 1.43 $ 0.68 $ 1.04 $ 3.63 2016 In millions, except per-share data First Quarter Second Quarter Third Quarter Fourth Quarter Full Year Net sales $ 1,190.0 $ 1,301.2 $ 1,210.7 $ 1,188.1 $ 4,890.0 Gross profit 431.3 481.8 440.9 440.1 1,794.1 Operating income 152.7 203.4 182.8 161.8 700.7 Net income from continuing operations 91.8 132.7 117.5 109.6 451.6 Income from discontinued operations, net of tax 15.6 10.1 22.9 21.4 70.0 Gain from sale of discontinued operations, net of tax — — 0.6 — 0.6 Net income 107.4 142.8 141.0 131.0 522.2 Earnings per ordinary share (1) Basic Continuing operations $ 0.50 $ 0.73 $ 0.65 $ 0.60 $ 2.49 Discontinued operations 0.09 0.06 0.13 0.12 0.39 Basic earnings per ordinary share $ 0.59 $ 0.79 $ 0.78 $ 0.72 $ 2.88 Diluted Continuing operations $ 0.50 $ 0.73 $ 0.64 $ 0.60 $ 2.47 Discontinued operations 0.09 0.05 0.13 0.11 0.38 Diluted earnings per ordinary share $ 0.59 $ 0.78 $ 0.77 $ 0.71 $ 2.85 (1) Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period. Fourth quarter 2017 includes decreases in operating income due to $30.7 million of separation costs, $25.2 million of trade name and other impairment charges and $1.6 million of "mark-to-market" actuarial losses on pension and other post-retirement benefit plans. Second quarter 2017 includes decreases in net income from continuing operations due to a $101.4 million loss on early extinguishment of debt. First quarter 2017 includes decreases in operating income due to $20.9 million of restructuring and other costs. Fourth quarter 2016 includes decreases in operating income due to trade name impairment charges of $13.3 million in Electrical and "mark-to-market" actuarial losses on pension and other post-retirement benefit plans of $4.2 million .

Financial Statements of Parent

Financial Statements of Parent Company Guarantor	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Financial Statements of Parent Company Guarantor	Supplemental Guarantor Information Pentair plc (the "Parent Company Guarantor") and Pentair Investments Switzerland GmbH (the "Subsidiary Guarantor"), fully and unconditionally, guarantee the Notes of Pentair Finance S.à r.l. (the "Subsidiary Issuer"). The Subsidiary Guarantor is a Switzerland limited liability company formed in April 2014 and 100 percent -owned subsidiary of the Parent Company Guarantor. The Subsidiary Issuer is a Luxembourg public limited liability company formed in January 2012 and 100 percent -owned subsidiary of the Subsidiary Guarantor. The guarantees provided by the Parent Company Guarantor and Subsidiary Guarantor are joint and several. The following supplemental financial information sets forth the Company's Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) and Condensed Consolidating Statement of Cash Flows for the years ended December 31, 2017 , 2016 and 2015 and Condensed Consolidating Balance Sheet as of December 31, 2017 and 2016 . Condensed Consolidating financial information for Pentair plc, Pentair Investments Switzerland GmbH and Pentair Finance S.à r.l. on a stand-alone basis is presented using the equity method of accounting for subsidiaries. Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,936.5 $ — $ 4,936.5 Cost of goods sold — — — 3,107.4 — 3,107.4 Gross profit — — — 1,829.1 — 1,829.1 Selling, general and administrative 4.1 0.6 — 1,027.8 — 1,032.5 Research and development — — — 115.8 — 115.8 Operating (loss) income (4.1 ) (0.6 ) — 685.5 — 680.8 Loss (earnings) from continuing operations of investment in subsidiaries (483.2 ) (482.6 ) (644.4 ) — 1,610.2 — Other (income) expense: Loss on sale of businesses — — — 4.2 — 4.2 Loss on early extinguishment of debt — — 91.0 10.4 — 101.4 Equity income of unconsolidated subsidiaries — — — (1.3 ) — (1.3 ) Interest income — (0.6 ) (69.2 ) (63.7 ) 123.6 (9.9 ) Interest expense — — 139.9 80.9 (123.6 ) 97.2 Income (loss) from continuing operations before income taxes 479.1 482.6 482.7 655.0 (1,610.2 ) 489.2 Provision (benefit) for income taxes (0.9 ) — — 10.1 — 9.2 Net income (loss) from continuing operations 480.0 482.6 482.7 644.9 (1,610.2 ) 480.0 Income from discontinued operations, net of tax — — — 5.4 — 5.4 Gain from sale of discontinued operations, net of tax — — — 181.1 — 181.1 Earnings (loss) from discontinued operations of investment in subsidiaries 186.5 186.5 186.5 — (559.5 ) — Net income (loss) $ 666.5 $ 669.1 $ 669.2 $ 831.4 $ (2,169.7 ) $ 666.5 Comprehensive income (loss), net of tax Net income (loss) $ 666.5 $ 669.1 $ 669.2 $ 831.4 $ (2,169.7 ) $ 666.5 Changes in cumulative translation adjustment 497.5 497.5 497.5 497.5 (1,492.5 ) 497.5 Changes in market value of derivative financial instruments, net of tax (4.6 ) (4.6 ) (4.6 ) (4.6 ) 13.8 (4.6 ) Comprehensive income (loss) $ 1,159.4 $ 1,162.0 $ 1,162.1 $ 1,324.3 $ (3,648.4 ) $ 1,159.4 Pentair plc and Subsidiaries Condensed Consolidating Balance Sheet December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Assets Current assets Cash and cash equivalents $ — $ — $ — $ 113.3 $ — $ 113.3 Accounts and notes receivable, net — — — 831.6 — 831.6 Inventories — — — 581.0 — 581.0 Other current assets 10.8 1.8 1.5 239.3 (30.5 ) 222.9 Total current assets 10.8 1.8 1.5 1,765.2 (30.5 ) 1,748.8 Property, plant and equipment, net — — — 545.5 — 545.5 Other assets Investments in subsidiaries 5,205.1 5,109.6 7,156.1 — (17,470.8 ) — Goodwill — — — 4,351.1 — 4,351.1 Intangibles, net — — — 1,558.4 — 1,558.4 Long-term intercompany debt — 94.1 614.0 (708.1 ) — — Other non-current assets 2.2 — — 2,317.1 (1,889.4 ) 429.9 Total other assets 5,207.3 5,203.7 7,770.1 7,518.5 (19,360.2 ) 6,339.4 Total assets $ 5,218.1 $ 5,205.5 $ 7,771.6 $ 9,829.2 $ (19,390.7 ) $ 8,633.7 Liabilities and Equity Current liabilities Accounts payable 1.4 — — 494.3 — 495.7 Employee compensation and benefits 0.4 — — 186.2 — 186.6 Other current liabilities 99.6 0.4 9.4 438.2 (30.5 ) 517.1 Total current liabilities 101.4 0.4 9.4 1,118.7 (30.5 ) 1,199.4 Other liabilities Long-term debt 48.4 — 2,652.8 628.9 (1,889.4 ) 1,440.7 Pension and other post-retirement compensation and benefits — — — 285.6 — 285.6 Deferred tax liabilities — — — 394.8 — 394.8 Other non-current liabilities 30.5 — — 244.9 — 275.4 Total liabilities 180.3 0.4 2,662.2 2,672.9 (1,919.9 ) 3,595.9 Equity 5,037.8 5,205.1 5,109.4 7,156.3 (17,470.8 ) 5,037.8 Total liabilities and equity $ 5,218.1 $ 5,205.5 $ 7,771.6 $ 9,829.2 $ (19,390.7 ) $ 8,633.7 Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ 677.0 $ 670.6 $ 661.3 $ 781.0 $ (2,169.7 ) $ 620.2 Investing activities Capital expenditures — — — (70.9 ) — (70.9 ) Proceeds from sale of property and equipment — — — 7.9 — 7.9 Proceeds from sale of businesses — — 2,765.6 (6.2 ) — 2,759.4 Acquisitions, net of cash acquired — — — (59.5 ) — (59.5 ) Net intercompany loan activity — (58.9 ) 103.7 172.6 (217.4 ) — Net cash provided by (used for) investing activities of continuing operations — (58.9 ) 2,869.3 43.9 (217.4 ) 2,636.9 Net cash provided by (used for) investing activities of discontinued operations — — — (6.5 ) — (6.5 ) Net cash provided by (used for) investing activities — (58.9 ) 2,869.3 37.4 (217.4 ) 2,630.4 Financing activities Net repayments of short-term borrowings — — — (0.8 ) — (0.8 ) Net receipts (repayments) of commercial paper and revolving long-term debt — — (914.7 ) 1.6 — (913.1 ) Repayment of long-term debt — — (1,917.8 ) (91.5 ) — (2,009.3 ) Premium paid on early extinguishment of debt — — (86.0 ) (8.9 ) — (94.9 ) Net change in advances to subsidiaries (262.5 ) (611.7 ) (685.9 ) (827.0 ) 2,387.1 — Shares issued to employees, net of shares withheld 37.2 — — — — 37.2 Repurchases of ordinary shares (200.0 ) — — — — (200.0 ) Dividends paid (251.7 ) — — — — (251.7 ) Net cash provided by (used for) financing activities (677.0 ) (611.7 ) (3,604.4 ) (926.6 ) 2,387.1 (3,432.6 ) Effect of exchange rate changes on cash and cash equivalents — — 73.8 (17.0 ) — 56.8 Change in cash and cash equivalents — — — (125.2 ) — (125.2 ) Cash and cash equivalents, beginning of year — — — 238.5 — 238.5 Cash and cash equivalents, end of year $ — $ — $ — $ 113.3 $ — $ 113.3 Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,890.0 $ — $ 4,890.0 Cost of goods sold — — — 3,095.9 — 3,095.9 Gross profit — — — 1,794.1 — 1,794.1 Selling, general and administrative 15.8 — 1.2 962.3 — 979.3 Research and development — — — 114.1 — 114.1 Operating (loss) income (15.8 ) — (1.2 ) 717.7 — 700.7 Loss (earnings) from continuing operations of investment in subsidiaries (466.0 ) (466.0 ) (578.1 ) — 1,510.1 — Other (income) expense: Loss on sale of businesses — — — 3.9 — 3.9 Equity income of unconsolidated subsidiaries — — — (4.3 ) — (4.3 ) Interest income — — (70.3 ) (54.5 ) 116.5 (8.3 ) Interest expense — — 181.2 83.7 (116.5 ) 148.4 Income (loss) from continuing operations before income taxes 450.2 466.0 466.0 688.9 (1,510.1 ) 561.0 Provision (benefit) for income taxes (1.4 ) — — 110.8 — 109.4 Net income (loss) from continuing operations 451.6 466.0 466.0 578.1 (1,510.1 ) 451.6 Income from discontinued operations, net of tax — — — 70.0 — 70.0 Gain from sale of discontinued operations, net of tax — — — 0.6 — 0.6 Earnings (loss) from discontinued operations of investment in subsidiaries 70.6 70.6 70.6 — (211.8 ) — Net income (loss) $ 522.2 $ 536.6 $ 536.6 $ 648.7 $ (1,721.9 ) $ 522.2 Comprehensive income (loss), net of tax Net income (loss) $ 522.2 $ 536.6 $ 536.6 $ 648.7 $ (1,721.9 ) $ 522.2 Changes in cumulative translation adjustment (83.0 ) (83.0 ) (83.0 ) (83.0 ) 249.0 (83.0 ) Changes in market value of derivative financial instruments, net of tax (8.3 ) (8.3 ) (8.3 ) (8.3 ) 24.9 (8.3 ) Comprehensive income (loss) $ 430.9 $ 445.3 $ 445.3 $ 557.4 $ (1,448.0 ) $ 430.9 Pentair plc and Subsidiaries Condensed Consolidating Balance Sheet December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Assets Current assets Cash and cash equivalents $ — $ — $ — $ 238.5 $ — $ 238.5 Accounts and notes receivable, net 0.1 — — 763.9 — 764.0 Inventories — — — 524.2 — 524.2 Other current assets 1.2 4.1 1.1 237.8 9.2 253.4 Current assets held for sale — — — 891.9 — 891.9 Total current assets 1.3 4.1 1.1 2,656.3 9.2 2,672.0 Property, plant and equipment, net — — — 538.6 — 538.6 Other assets Investments in subsidiaries 4,509.5 4,471.4 9,295.5 — (18,276.4 ) — Goodwill — — — 4,217.4 — 4,217.4 Intangibles, net — — — 1,631.8 — 1,631.8 Other non-current assets 2.2 35.2 717.8 1,568.9 (2,142.0 ) 182.1 Non-current assets held for sale — — — 2,292.9 — 2,292.9 Total other assets 4,511.7 4,506.6 10,013.3 9,711.0 (20,418.4 ) 8,324.2 Total assets $ 4,513.0 $ 4,510.7 $ 10,014.4 $ 12,905.9 $ (20,409.2 ) $ 11,534.8 Liabilities and Equity Current liabilities Current maturities of long-term debt and short-term borrowings $ — $ — $ — $ 0.8 $ — $ 0.8 Accounts payable $ 0.7 $ — $ 0.1 $ 435.8 $ — $ 436.6 Employee compensation and benefits 0.8 — — 165.3 — 166.1 Other current liabilities 95.2 1.2 26.7 379.2 9.2 511.5 Current liabilities held for sale — — — 356.2 — 356.2 Total current liabilities 96.7 1.2 26.8 1,337.3 9.2 1,471.2 Other liabilities Long-term debt 148.1 — 5,515.9 756.4 (2,142.0 ) 4,278.4 Pension and other post-retirement compensation and benefits — — — 253.4 — 253.4 Deferred tax liabilities — — — 609.5 — 609.5 Other non-current liabilities 13.8 — — 148.2 — 162.0 Non-current liabilities held for sale — — — 505.9 — 505.9 Total liabilities 258.6 1.2 5,542.7 3,610.7 (2,132.8 ) 7,280.4 Equity 4,254.4 4,509.5 4,471.7 9,295.2 (18,276.4 ) 4,254.4 Total liabilities and equity $ 4,513.0 $ 4,510.7 $ 10,014.4 $ 12,905.9 $ (20,409.2 ) $ 11,534.8 Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ 522.7 $ 463.1 $ 469.5 $ 916.2 $ (1,510.1 ) $ 861.4 Investing activities Capital expenditures — — — (117.8 ) — (117.8 ) Proceeds from sale of property and equipment — — — 24.7 — 24.7 Proceeds from sale of businesses, net — — — (5.2 ) — (5.2 ) Acquisitions, net of cash acquired — — — (25.0 ) — (25.0 ) Net intercompany loan activity — — 667.3 (191.0 ) (476.3 ) — Net cash provided by (used for) investing activities of continuing operations — — 667.3 (314.3 ) (476.3 ) (123.3 ) Net cash provided by (used for) investing activities from discontinued operations — — — 1.5 — 1.5 Net cash provided by (used for) investing activities — — 667.3 (312.8 ) (476.3 ) (121.8 ) Financing activities Net receipts of short-term borrowings — — — 0.8 — 0.8 Net receipts (repayments) of commercial paper and revolving long-term debt — — (385.8 ) 0.5 — (385.3 ) Repayment of long-term debt — — — (0.7 ) — (0.7 ) Net change in advances to subsidiaries (299.8 ) (463.1 ) (778.9 ) (444.6 ) 1,986.4 — Excess tax benefits from share-based compensation — — — 8.0 — 8.0 Shares issued to employees, net of shares withheld 20.7 — — — — 20.7 Dividends paid (243.6 ) — — — — (243.6 ) Net cash provided by (used for) financing activities (522.7 ) (463.1 ) (1,164.7 ) (436.0 ) 1,986.4 (600.1 ) Effect of exchange rate changes on cash and cash equivalents — — 27.8 (55.1 ) — (27.3 ) Change in cash and cash equivalents — — (0.1 ) 112.3 — 112.2 Cash and cash equivalents, beginning of year — — 0.1 126.2 — 126.3 Cash and cash equivalents, end of year $ — $ — $ — $ 238.5 $ — $ 238.5 Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2015 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,616.4 $ — $ 4,616.4 Cost of goods sold — — — 3,017.6 — 3,017.6 Gross profit — — — 1,598.8 — 1,598.8 Selling, general and administrative 33.7 2.2 5.3 842.8 — 884 Research and development — — — 98.7 — 98.7 Operating (loss) income (33.7 ) (2.2 ) (5.3 ) 657.3 — 616.1 Loss (earnings) from continuing operations of investment in subsidiaries (436.1 ) (439.7 ) (475.1 ) — 1,350.9 — Other (income) expense: Loss on sale of businesses — — — 3.2 — 3.2 Equity income of unconsolidated subsidiaries — — — (1.5 ) — (1.5 ) Interest income — — (80.6 ) (33.8 ) 109.7 (4.7 ) Interest expense — 1.4 126.3 88.6 (109.7 ) 106.6 Income (loss) from continuing operations before income taxes 402.4 436.1 424.1 600.8 (1,350.9 ) 512.5 Provision for income taxes 5.3 — — 110.1 — 115.4 Net income (loss) from continuing operations 397.1 436.1 424.1 490.7 (1,350.9 ) 397.1 Loss from discontinued operations, net of tax — — — (466.8 ) — (466.8 ) Loss from sale of discontinued operations, net of tax — — — (6.7 ) — (6.7 ) Earnings (loss) from discontinued operations of investment in subsidiaries (473.5 ) (473.5 ) (473.5 ) — 1,420.5 — Net income (loss) $ (76.4 ) $ (37.4 ) $ (49.4 ) $ 17.2 $ 69.6 $ (76.4 ) Comprehensive income (loss), net of tax Net income (loss) $ (76.4 ) $ (37.4 ) $ (49.4 ) $ 17.2 $ 69.6 $ (76.4 ) Changes in cumulative translation adjustment (264.9 ) (264.9 ) (264.9 ) (264.9 ) 794.7 (264.9 ) Changes in market value of derivative financial instruments, net of tax 0.2 0.2 0.2 0.2 (0.6 ) 0.2 Comprehensive income (loss) $ (341.1 ) $ (302.1 ) $ (314.1 ) $ (247.5 ) $ 863.7 $ (341.1 ) Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2015 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ (43.0 ) $ (48.7 ) $ (5.8 ) $ 767.1 $ 69.7 $ 739.3 Investing activities Capital expenditures — — — (91.3 ) — (91.3 ) Proceeds from sale of property and equipment — — — 4.6 — 4.6 Acquisitions, net of cash acquired — — — (1,913.9 ) — (1,913.9 ) Net intercompany loan activity — — 891.0 (295.0 ) (596.0 ) — Proceeds from sale of businesses and other — — — (3.0 ) — (3.0 ) Net cash provided by (used for) investing activities of continuing operations — — 891.0 (2,298.6 ) (596.0 ) (2,003.6 ) Net cash provided by (used for) investing activities of discontinued operations — — — 38.1 — 38.1 Net cash provided by (used for) investing activities — — 891.0 (2,260.5 ) (596.0 ) (1,965.5 ) Financing activities Net repayments on short-term borrowings — — — (2.3 ) — (2.3 ) Net receipts of commercial paper and revolving long-term debt — — 346.9 16.6 — 363.5 Proceeds from long-term debt — — 1,714.8 — — 1,714.8 Repayment of long-term debt — — (350.0 ) (6.6 ) — (356.6 ) Debt issuance costs — — (26.8 ) — — (26.8 ) Net change in advances to subsidiaries 471.7 48.7 (2,553.7 ) 1,507.0 526.3 — Excess tax benefits from share-based compensation — — — 6.0 — 6.0 Shares issued to employees, net of shares withheld 3.0 — — 16.4 — 19.4 Repurchases of ordinary shares (200.0 ) — — — — (200.0 ) Dividends paid (231.7 ) — — — — (231.7 ) Net cash provided by (used for) financing activities 43.0 48.7 (868.8 ) 1,537.1 526.3 1,286.3 Effect of exchange rate changes on cash and cash equivalents — — (16.4 ) (27.8 ) — (44.2 ) Change in cash and cash equivalents — — — 15.9 — 15.9 Cash and cash equivalents, beginning of year — — 0.1 110.3 — 110.4 Cash and cash equivalents, end of year $ — $ — $ 0.1 $ 126.2 $ — $ 126.3

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Schedule II - Valuation and Qualifying Accounts	Schedule II — Valuation and Qualifying Accounts Pentair plc and Subsidiaries In millions Beginning balance Additions charged (reductions credited) to costs and expenses Deductions (1) Other changes (2) Ending balance Allowances for doubtful accounts Year ended December 31, 2017 $ 16.4 $ 0.8 $ 4.5 $ 1.1 $ 13.8 Year ended December 31, 2016 $ 19.0 $ 1.2 $ 4.1 $ 0.3 $ 16.4 Year ended December 31, 2015 $ 12.1 $ 10.1 $ 2.4 $ (0.8 ) $ 19.0 (1) Uncollectible accounts written off, net of recoveries (2) Result of foreign currency effects

Basis of Presentation and Sum28

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of presentation The accompanying consolidated financial statements include the accounts of Pentair and all subsidiaries, both the United States ("U.S.") and non-U.S., which we control. Intercompany accounts and transactions have been eliminated. Investments in companies of which we own 20% to 50% of the voting stock or have the ability to exercise significant influence over operating and financial policies of the investee are accounted for using the equity method of accounting and as a result, our share of the earnings or losses of such equity affiliates is included in the Consolidated Statements of Operations and Comprehensive Income (Loss). The consolidated financial statements have been prepared in U.S. dollars ("USD") and in accordance with accounting principles generally accepted in the United States of America ("GAAP").
Fiscal Year	Fiscal year Our fiscal year ends on December 31. Beginning with the first quarter of 2016, we report our interim quarterly periods on a calendar quarter basis. Prior to the first quarter of 2016, we reported our interim quarterly periods on a 13-week basis ending on a Saturday.
Use of Estimates	Use of estimates The preparation of our consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes, disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include our accounting for valuation of goodwill and indefinite lived intangible assets, estimated losses on accounts receivable, estimated realizable value on excess and obsolete inventory, percentage of completion revenue recognition, assets acquired and liabilities assumed in acquisitions, estimated selling proceeds from assets held for sale, contingent liabilities, income taxes and pension and other post-retirement benefits. Actual results could differ from our estimates.
Revenue Recognition	Revenue recognition We recognize revenue when it is realized or realizable and has been earned. Revenue is recognized when persuasive evidence of an arrangement exists, shipment or delivery has occurred (depending on the terms of the sale), our price to the buyer is fixed or determinable, and collectability is reasonably assured. Generally, there is no post-shipment obligation on product sold other than warranty obligations in the normal and ordinary course of business. In the event significant post-shipment obligations were to exist, revenue recognition would be deferred until substantially all obligations were satisfied. Percentage of completion Revenue from certain long-term contracts is recognized over the contractual period under the percentage of completion method of accounting. Under this method, sales and gross profit are recognized as work is performed either based on the relationship between the actual costs incurred and the total estimated costs at completion ("the cost-to-cost method") or based on efforts for measuring progress towards completion in situations in which this approach is more representative of the progress on the contract than the cost-to-cost method. Changes to the original estimates may be required during the life of the contract and such estimates are reviewed on a regular basis. Sales and gross profit are adjusted using the cumulative catch-up method for revisions in estimated total contract costs. These reviews have not resulted in adjustments that were significant to our results of operations. Estimated losses are recorded when identified. Claims against customers are recognized as revenue upon settlement. We record costs and earnings in excess of billings on uncompleted contracts within Other current assets and billings in excess of costs and earnings on uncompleted contracts within Other current liabilities in the Consolidated Balance Sheets. Sales returns The right of return may exist explicitly or implicitly with our customers. Our return policy allows for customer returns only upon our authorization. Goods returned must be product we continue to market and must be in salable condition. At the time of sale, we reduce revenue for the estimated effect of returns. Estimated sales returns include consideration of historical sales levels, the timing and magnitude of historical sales return levels as a percent of sales, type of product, type of customer and a projection of this experience into the future. Pricing and sales incentives We record estimated reductions to revenue for customer programs and incentive offerings including pricing arrangements, promotions and other volume-based incentives at the later of the date revenue is recognized or the incentive is offered. Sales incentives given to our customers are recorded as a reduction of revenue unless we (1) receive an identifiable benefit for the goods or services in exchange for the consideration and (2) we can reasonably estimate the fair value of the benefit received. Pricing is established at or prior to the time of sale with our customers and we record sales at the agreed-upon net selling price. However, we allow customers to apply for a refund of a percentage of the original purchase price if they can demonstrate sales to a qualifying end customer. At the time of sale, we estimate the anticipated refund to be paid based on historical experience and reduce sales for the probable cost of the discount. The cost of these refunds is recorded as a reduction in gross sales. Volume-based incentives involve rebates that are negotiated at or prior to the time of sale with the customer and are redeemable only if the customer achieves a specified cumulative level of sales or sales increase. Under these incentive programs, at the time of sale, we estimate the anticipated rebate to be paid based on forecasted sales levels. These forecasts are updated at least quarterly for each customer and sales are reduced for the anticipated cost of the rebate. If the forecasted sales for a customer changes, the accrual for rebates is adjusted to reflect the new amount of rebates expected to be earned by the customer.
Shipping and Handling Costs	Shipping and handling costs Amounts billed to customers for shipping and handling are recorded in Net sales in the accompanying Consolidated Statements of Operations and Comprehensive Income (Loss). Shipping and handling costs incurred by Pentair for the delivery of goods to customers are included in Cost of goods sold in the accompanying Consolidated Statements of Operations and Comprehensive Income (Loss).
Research and Development	Research and development We conduct research and development ("R&D") activities primarily in our own facilities, which consist primarily of the development of new products, product applications and manufacturing processes. We expense R&D costs as incurred. R&D expenditures during 2017 , 2016 and 2015 were $115.8 million , $114.1 million and $98.7 million , respectively.
Cash Equivalents	Cash equivalents We consider highly liquid investments with original maturities of three months or less at the date of acquisition to be cash equivalents.
Trade Receivables and Concentration of Credit Risk	Trade receivables and concentration of credit risk We record an allowance for doubtful accounts, reducing our receivables balance to an amount we estimate is collectible from our customers. Estimates used in determining the allowance for doubtful accounts are based on current trends, aging of accounts receivable, periodic credit evaluations of our customers' financial condition, and historical collection experience. We generally do not require collateral. No customer receivable balances exceeded 10% of total net receivable balances as of December 31, 2017 or December 31, 2016 .
Inventories	December 31, 2016 . Inventories Inventories are stated at the lower of cost or market with substantially all inventories recorded using the first-in, first-out ("FIFO") cost method.
Property, Plant and Equipment, Net	. Property, plant and equipment, net Property, plant and equipment is stated at historical cost. We compute depreciation by the straight-line method based on the following estimated useful lives: Years Land improvements 5 to 20 Buildings and leasehold improvements 5 to 50 Machinery and equipment 3 to 15 Significant improvements that add to productive capacity or extend the lives of properties are capitalized. Costs for repairs and maintenance are charged to expense as incurred. When property is retired or otherwise disposed of, the recorded cost of the assets and their related accumulated depreciation are removed from the Consolidated Balance Sheets and any related gains or losses are included in income. We review the recoverability of long-lived assets to be held and used, such as property, plant and equipment, when events or changes in circumstances occur that indicate the carrying value of the asset or asset group may not be recoverable. The assessment of possible impairment is based on our ability to recover the carrying value of the asset or asset group from the expected future pre-tax cash flows (undiscounted and without interest charges) of the related operations. If these cash flows are less than the carrying value of such asset or asset group, an impairment loss is recognized for the difference between estimated fair value and carrying value. Impairment losses on long-lived assets held for sale are determined in a similar manner, except that fair values are reduced for the cost to dispose of the assets. The measurement of impairment requires us to estimate future cash flows and the fair value of long-lived assets. We recorded no impairment charges in 2017 or 2016 in conjunction with restructuring activities. During 2015 we recorded $5.1 million of asset impairment in conjunction with restructuring activities.
Goodwill and identifiable intangible assets	Goodwill and identifiable intangible assets Goodwill Goodwill represents the excess of the cost of acquired businesses over the net of the fair value of identifiable tangible net assets and identifiable intangible assets purchased and liabilities assumed. Goodwill is tested at least annually for impairment and is tested for impairment more frequently if events or changes in circumstances indicate that the asset might be impaired. The impairment test is performed using a two-step process. In the first step, the fair value of each reporting unit is compared with the carrying amount of the reporting unit, including goodwill. If the estimated fair value is less than the carrying amount of the reporting unit there is an indication that goodwill impairment exists and a second step must be completed in order to determine the amount of the goodwill impairment, if any, that should be recorded. In the second step, an impairment loss is recognized for any excess of the carrying amount of the reporting unit's goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation. The fair value of each reporting unit is determined using a discounted cash flow analysis and market approach. Projecting discounted future cash flows requires us to make significant estimates regarding future revenues and expenses, projected capital expenditures, changes in working capital and the appropriate discount rate. Use of the market approach consists of comparisons to comparable publicly-traded companies that are similar in size and industry. Actual results may differ from those used in our valuations. This non-recurring fair value measurement is a "Level 3" measurement under the fair value hierarchy described below. In developing our discounted cash flow analysis, assumptions about future revenues and expenses, capital expenditures and changes in working capital, are based on our annual operating plan and long-term business plan for each of our reporting units. These plans take into consideration numerous factors including historical experience, anticipated future economic conditions, changes in raw material prices and growth expectations for the industries and end markets we participate in. These assumptions are determined over a six year long-term planning period. The six year growth rates for revenues and operating profits vary for each reporting unit being evaluated. Revenues and operating profit beyond 2023 are projected to grow at a perpetual growth rate of 3.0% . Discount rate assumptions for each reporting unit take into consideration our assessment of risks inherent in the future cash flows of the respective reporting unit and our weighted-average cost of capital. We utilized discount rates ranging from 9.0% to 9.5% in determining the discounted cash flows in our fair value analysis. In estimating fair value using the market approach, we identify a group of comparable publicly-traded companies for each reporting unit that are similar in terms of size and product offering. These groups of comparable companies are used to develop multiples based on total market-based invested capital as a multiple of earnings before interest, taxes, depreciation and amortization ("EBITDA"). We determine our estimated values by applying these comparable EBITDA multiples to the operating results of our reporting units. The ultimate fair value of each reporting unit is determined considering the results of both valuation methods. We completed step one of our annual goodwill impairment evaluation as of the first day of the fourth quarter of 2017 , 2016 and 2015 with each reporting unit's fair value in excess of its carrying value. During the latter part of the fourth quarter of 2015, the oil and gas industry continued to deteriorate, leading management to reconsider its estimates for future profitability of our former Valves & Controls business and thereby increasing the likelihood that the associated goodwill could be impaired. As such, we concluded that a triggering event occurred during the fourth quarter of 2015 requiring that we test Valves & Controls goodwill for impairment. As a result, we reperformed our step one analysis as of December 31, 2015. Consistent with our annual test, the fair value was estimated using both a discounted cash flow analysis and market approach. The results of our step one goodwill impairment testing as of December 31, 2015 indicated that the fair value of Valves & Controls was below its carrying value. Accordingly, we performed the step two test and concluded the goodwill of Valves & Controls was impaired. As a result, we recorded a non-cash goodwill impairment charge of $515.2 million for the year ended December 31, 2015. The impairment is included in Income (loss) from discontinued operations, net of tax in our Consolidated Statements of Operations and Comprehensive Income (Loss). Identifiable intangible assets Our primary identifiable intangible assets include: customer relationships, trade names, proprietary technology and patents. Identifiable intangibles with finite lives are amortized and those identifiable intangibles with indefinite lives are not amortized. Identifiable intangible assets that are subject to amortization are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Identifiable intangible assets not subject to amortization are tested for impairment annually or more frequently if events warrant. We complete our annual impairment test during the fourth quarter each year for those identifiable assets not subject to amortization. The impairment test for trade names consists of a comparison of the fair value of the trade name with its carrying value. Fair value is measured using the relief-from-royalty method. This method assumes the trade name has value to the extent that the owner is relieved of the obligation to pay royalties for the benefits received from them. This method requires us to estimate the future revenue for the related brands, the appropriate royalty rate and the weighted average cost of capital. The non-recurring fair value measurement is a "Level 3" measurement under the fair value hierarchy described below.
Income Taxes	Income taxes We use the asset and liability approach to account for income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period when the change is enacted. We maintain valuation allowances unless it is more likely than not that all or a portion of the deferred tax assets will be realized. Changes in valuation allowances from period to period are included in our tax provision in the period of change. We recognize the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs.
Pension and other post-retirement plans	Pension and other post-retirement plans We sponsor U.S. and non-U.S. defined-benefit pension and other post-retirement plans. The pension and other post-retirement benefit costs for company-sponsored benefit plans are determined from actuarial assumptions and methodologies, including discount rates and expected returns on plan assets. These assumptions are updated annually and are disclosed in Note 13. We recognize changes in the fair value of plan assets and net actuarial gains or losses for pension and other post-retirement benefits annually in the fourth quarter each year ("mark-to-market adjustment") and, if applicable, in any quarter in which an interim remeasurement is triggered. Net actuarial gains and losses occur when the actual experience differs from any of the various assumptions used to value our pension and other post-retirement plans or when assumptions change, as they may each year. The remaining components of pension expense, including service and interest costs and estimated return on plan assets, are recorded on a quarterly basis.
Insurance Subsidiary	Insurance subsidiary We insure certain general and product liability, property, workers' compensation and automobile liability risks through our regulated wholly-owned captive insurance subsidiary, Penwald Insurance Company ("Penwald"). Reserves for policy claims are established based on actuarial projections of ultimate losses. As of December 31, 2017 and 2016 , reserves for policy claims were $61.5 million ( $13.2 million included in Other current liabilities and $48.3 million included in Other non-current liabilities ) and $63.0 million ( $13.2 million included in Other current liabilities and $49.8 million included in Other non-current liabilities ), respectively.
Share-Based Compensation	Share-based compensation We account for share-based compensation awards on a fair value basis. The estimated grant date fair value of each option award is recognized in income on an accelerated basis over the requisite service period (generally the vesting period). The estimated fair value of each option award is calculated using the Black-Scholes option-pricing model. From time to time, we have elected to modify the terms of the original grant. These modified grants are accounted for as a new award and measured using the fair value method, resulting in the inclusion of additional compensation expense in our Consolidated Statements of Operations and Comprehensive Income (Loss). Restricted share awards and units are recorded as compensation cost on an accelerated basis over the requisite service periods based on the market value on the date of grant. Performance share units ("PSUs") are stock awards where the ultimate number of shares issued will be contingent on the Company's performance against certain financial performance targets. The fair value of each PSU is based on the market value on the date of grant. We recognize expense related to the estimated vesting of our PSUs granted. The estimated vesting of the PSUs is based on the probability of achieving certain financial performance thresholds over the specified performance period.
Earnings (Loss) Per Common Share	Earnings (loss) per ordinary share Basic earnings (loss) per share are computed by dividing net income (loss) attributable to Pentair plc by the weighted-average number of ordinary shares outstanding. Diluted earnings (loss) per share are computed by dividing net income (loss) attributable to Pentair plc by the weighted-average number of ordinary shares outstanding including the dilutive effects of ordinary share equivalents.
Derivative Financial Instruments	Derivative financial instruments We recognize all derivatives, including those embedded in other contracts, as either assets or liabilities at fair value in our Consolidated Balance Sheets. If the derivative is designated and is effective as a cash-flow hedge, the effective portion of changes in the fair value of the derivative are recorded in Accumulated other comprehensive income (loss) ("AOCI") as a separate component of equity in the Consolidated Balance Sheets and are recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss) when the hedged item affects earnings. If the underlying hedged transaction ceases to exist or if the hedge becomes ineffective, all changes in fair value of the related derivatives that have not been settled are recognized in current earnings. For a derivative that is not designated as or does not qualify as a hedge, changes in fair value are reported in earnings immediately. Gains and losses on net investment hedges are included in AOCI as a separate component of equity in the Consolidated Balance Sheets. We use derivative instruments for the purpose of hedging interest rate and currency exposures, which exist as part of ongoing business operations. We do not hold or issue derivative financial instruments for trading or speculative purposes. All other contracts that contain provisions meeting the definition of a derivative also meet the requirements of and have been designated as, normal purchases or sales. Our policy is not to enter into contracts with terms that cannot be designated as normal purchases or sales. From time to time, we may enter into short duration foreign currency contracts to hedge foreign currency risks.
Fair Value Measurements	Fair value measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities measured at fair value are classified using the following hierarchy, which is based upon the transparency of inputs to the valuation as of the measurement date: Level 1: Valuation is based on observable inputs such as quoted market prices (unadjusted) for identical assets or liabilities in active markets. Level 2: Valuation is based on inputs such as quoted market prices for similar assets or liabilities in active markets or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Level 3: Valuation is based upon other unobservable inputs that are significant to the fair value measurement. In making fair value measurements, observable market data must be used when available. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.
Foreign Currency Translation	Foreign currency translation The financial statements of subsidiaries located outside of the U.S. are generally measured using the local currency as the functional currency, except for certain corporate entities outside of the U.S. which are measured using USD. Assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date. Income and expense items are translated at average monthly rates of exchange. The resultant translation adjustments are included in AOCI, a separate component of equity.
New accounting standards	New accounting standards In March 2017, the Financial Accounting Standards Board ("FASB") issued a new accounting standard which requires the presentation of all components of net periodic benefit cost other than service costs outside of operating income. Only the service cost component will be included in operating income and eligible for capitalization in assets. The new guidance related to the presentation of the components of net periodic benefit cost within the Consolidated Statement of Operations will be applied retrospectively. The new guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within that reporting period. We adopted this standard on January 1, 2018. As a result of adoption, $10.7 million and $13.3 million of pension and post-retirement expense and $ 12.7 million of pension and post-retirement benefit will be reclassified out of operating income for the years ended December 31, 2017, 2016 and 2015, respectively. In March 2016, the FASB issued a new accounting standard for share-based payments. The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the Consolidated Statements of Cash Flows. We adopted the new standard in the first quarter of 2017. The impact of the adoption resulted in the following: • All excess tax benefits and deficiencies arising from employee share-based payment awards, and dividends on those awards, will be recognized within income taxes in the period in which they occur rather than within additional paid-in-capital. Our adoption of this requirement under the new standard had no material impact for the year ended December 31, 2017. • The Company no longer presents excess tax benefits within cash flows from financing activities in the Consolidated Statements of Cash Flows; instead these are now reflected within cash flows from operating activities. The Company elected to apply this change prospectively. • The Company elected not to change its policy on accounting for forfeitures and continues to estimate the total number of awards for which the requisite service period will not be rendered. • The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of our diluted earnings per share for the year ended December 31, 2017. This increased diluted weighted average common shares outstanding by less than 300,000 shares for the year ended December 31, 2017. In February 2016, the FASB issued new accounting requirements regarding accounting for leases, which require an entity to recognize both assets and liabilities arising from financing and operating leases, along with additional qualitative and quantitative disclosures. The new requirements are effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and early adoption is permitted. We have not yet determined the potential effects on our financial condition or results of operations. In May 2014, the FASB issued new accounting requirements for the recognition of revenue from contracts with customers. The new rules require entities to recognize revenue when they transfer control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new requirements also include additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The requirements are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. We adopted the new revenue guidance as of January 1, 2018, using the modified retrospective transition method of adoption applied to those contracts which were not completed as of that date. An adjustment will be recorded to our 2018 beginning retained earnings for the cumulative effect of the change. In preparation for adoption of the new guidance, we have implemented appropriate changes to our business processes, systems and controls to support preparation of financial information and have reached conclusions on key accounting assessments related to the standard. As a result of these assessments, the adoption of the new standard will not have a material impact on our consolidated financial statements, including the presentation of revenues in our consolidated statements of operations.

Basis of Presentation and Sum29

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Estimated Useful Lives of Property and Equipment	Property, plant and equipment, net Property, plant and equipment is stated at historical cost. We compute depreciation by the straight-line method based on the following estimated useful lives: Years Land improvements 5 to 20 Buildings and leasehold improvements 5 to 50 Machinery and equipment 3 to 15

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes our estimates of the fair values of the assets acquired and liabilities assumed in the ERICO Acquisition as previously reported at December 31, 2015 and as revised for adjustments made during 2016: In millions As Originally Reported As Revised Cash $ 11.8 $ 11.8 Accounts receivable 75.9 75.9 Inventories 102.4 101.8 Other current assets 2.9 2.8 Property, plant and equipment 53.4 53.1 Identifiable intangible assets 1,033.8 1,033.8 Goodwill 1,061.9 1,031.0 Current liabilities (97.2 ) (94.7 ) Deferred income taxes, including current (418.8 ) (382.3 ) Other liabilities (8.0 ) (15.1 ) Purchase price $ 1,818.1 $ 1,818.1
Pro Forma Consolidated Condensed Financial Results of Operations	Year ended December 31 In millions, except share and per-share data 2015 Pro forma net sales $ 5,002.6 Pro forma net income from continuing operations 460.4 Pro forma earnings per ordinary share - continuing operations Basic $ 2.55 Diluted 2.52

Discontinued Operations Disco31

Discontinued Operations Discontinued Operations and Divestitures (Tables)	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	Operating results of discontinued operations are summarized below: Years ended December 31 In millions 2017 2016 2015 Net sales $ 450.3 $ 1,639.4 $ 1,858.6 Cost of goods sold 339.7 1,177.1 1,271.2 Gross profit 110.6 462.3 587.4 Selling, general and administrative 103.3 367.6 457.8 Research and development 5.7 18.2 21.2 Impairment of goodwill and trade names — — 554.7 Operating Income (loss) $ 1.6 $ 76.5 $ (446.3 ) Income (loss) from discontinued operations before income taxes $ 2.4 $ 77.2 $ (445.5 ) Provision for income taxes (3.0 ) 7.2 21.3 Income (loss) from discontinued operations, net of tax $ 5.4 $ 70.0 $ (466.8 ) Gain (loss) from sale / impairment of discontinued operations before income taxes $ 183.5 $ 0.6 $ (6.7 ) Provision for income taxes 2.4 — — Gain (loss) from sale / impairment of discontinued operations, net of tax $ 181.1 $ 0.6 $ (6.7 ) The carrying amounts of major classes of assets and liabilities that were classified as held for sale on the Consolidated Balance Sheets were as follows: December 31 In millions 2017 2016 Accounts and notes receivable, net $ — $ 365.4 Inventories — 491.5 Other current assets — 35.0 Current assets held for sale $ — $ 891.9 Property, plant and equipment, net $ — $ 361.5 Goodwill — 996.4 Intangibles, net — 703.5 Asbestos-related insurance receivable — 108.5 Other non-current assets — 123.0 Non-current assets held for sale $ — $ 2,292.9 Accounts payable $ — $ 151.4 Employee compensation and benefits — 61.5 Other current liabilities — 143.3 Current liabilities held for sale $ — $ 356.2 Pension and other post-retirement compensation and benefits $ — $ 32.2 Deferred tax liabilities — 162.8 Asbestos-related liabilities — 228.3 Other non-current liabilities — 82.6 Non-current liabilities held for sale $ — $ 505.9

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Basic and Diluted Earnings (Loss) Per Share	Basic and diluted earnings (loss) per share were calculated as follows: Years ended December 31 In millions, except per share data 2017 2016 2015 Net income (loss) $ 666.5 $ 522.2 $ (76.4 ) Net income from continuing operations $ 480.0 $ 451.6 $ 397.1 Weighted average ordinary shares outstanding Basic 181.7 181.3 180.3 Dilutive impact of stock options and restricted stock awards 2.0 1.8 2.3 Diluted 183.7 183.1 182.6 Earnings (loss) per ordinary share Basic Continuing operations $ 2.64 $ 2.49 $ 2.20 Discontinued operations 1.03 0.39 (2.62 ) Basic earnings (loss) per ordinary share $ 3.67 $ 2.88 $ (0.42 ) Diluted Continuing operations $ 2.61 $ 2.47 $ 2.17 Discontinued operations 1.02 0.38 (2.59 ) Diluted earnings (loss) per ordinary share $ 3.63 $ 2.85 $ (0.42 ) Anti-dilutive stock options excluded from the calculation of diluted earnings per share 1.8 1.2 1.3

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring Related Costs	Restructuring related costs included in Selling, general and administrative expenses in the Consolidated Statements of Operations and Comprehensive Income (Loss) included costs for severance and other restructuring costs as follows: Years ended December 31 In millions 2017 2016 2015 Severance and related costs $ 57.1 $ 24.5 $ 34.5 Other 1.6 — 6.8 Total restructuring costs $ 58.7 $ 24.5 $ 41.3
Restructuring Costs By Segment [Table Text Block]	Restructuring costs by reportable segment were as follows: Years ended December 31 In millions 2017 2016 2015 Water $ 23.6 $ 10.5 $ 17.4 Electrical 16.8 12.3 15.7 Other 18.3 1.7 8.2 Consolidated $ 58.7 $ 24.5 $ 41.3
Restructuring Accrual Activity Recorded on Consolidated Balance Sheets	Activity related to accrued severance and related costs recorded in Other current liabilities in the Consolidated Balance Sheets is summarized as follows: Years ended December 31 In millions 2017 2016 Beginning balance $ 25.4 $ 37.1 Costs incurred 57.1 24.5 Cash payments and other (42.7 ) (36.2 ) Ending balance $ 39.8 $ 25.4

Goodwill and Other Identifiab34

Goodwill and Other Identifiable Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 by reportable segment were as follows: In millions December 31, 2016 Acquisitions/ Foreign currency December 31, 2017 Water $ 1,994.6 $ 27.3 $ 91.0 $ 2,112.9 Electrical 2,222.8 5.3 10.1 2,238.2 Total goodwill $ 4,217.4 $ 32.6 $ 101.1 $ 4,351.1 In millions December 31, 2015 Acquisitions/ Purchase accounting adjustments Foreign currency December 31, 2016 Water $ 2,003.8 $ 20.8 $ — $ (30.0 ) $ 1,994.6 Electrical 2,255.2 — (30.9 ) (1.5 ) 2,222.8 Total goodwill $ 4,259.0 $ 20.8 $ (30.9 ) $ (31.5 ) $ 4,217.4
Identifiable Intangible Assets	Identifiable intangible assets consisted of the following at December 31: 2017 2016 In millions Cost Accumulated amortization Net Cost Accumulated amortization Net Definite-life intangibles Customer relationships $ 1,513.9 $ (437.5 ) $ 1,076.4 $ 1,478.0 $ (346.7 ) $ 1,131.3 Trade names 1.5 (1.4 ) 0.1 1.8 (1.4 ) 0.4 Proprietary technology and patents 131.9 (94.2 ) 37.7 141.3 (100.3 ) 41.0 Total finite-life intangibles 1,647.3 (533.1 ) 1,114.2 1,621.1 (448.4 ) 1,172.7 Indefinite-life intangibles Trade names 444.2 — 444.2 459.1 — 459.1 Total intangibles $ 2,091.5 $ (533.1 ) $ 1,558.4 $ 2,080.2 $ (448.4 ) $ 1,631.8
Estimated Future Amortization Expense for Identifiable Intangible Assets	Estimated future amortization expense for identifiable intangible assets during the next five years is as follows: In millions 2018 2019 2020 2021 2022 Estimated amortization expense $ 96.3 $ 89.2 $ 84.0 $ 77.5 $ 70.0

Supplemental Balance Sheet In35

Supplemental Balance Sheet Information (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information	December 31 In millions 2017 2016 Inventories Raw materials and supplies $ 255.1 $ 223.5 Work-in-process 83.0 67.3 Finished goods 242.9 233.4 Total inventories $ 581.0 $ 524.2 Other current assets Cost in excess of billings $ 121.4 $ 107.7 Prepaid expenses 80.7 68.7 Prepaid income taxes 15.3 67.2 Other current assets 5.5 9.8 Total other current assets $ 222.9 $ 253.4 Property, plant and equipment, net Land and land improvements $ 72.6 $ 66.2 Buildings and leasehold improvements 354.5 335.0 Machinery and equipment 1,011.6 932.5 Construction in progress 35.1 68.6 Total property, plant and equipment 1,473.8 1,402.3 Accumulated depreciation and amortization 928.3 863.7 Total property, plant and equipment, net $ 545.5 $ 538.6 Other non-current assets Prepaid income taxes $ 254.3 $ — Deferred income taxes 43.0 39.0 Deferred compensation plan assets 49.4 47.9 Other non-current assets 83.2 95.2 Total other non-current assets $ 429.9 $ 182.1 Other current liabilities Dividends payable $ 63.1 $ 61.8 Accrued warranty 41.0 38.9 Accrued rebates 92.7 78.2 Billings in excess of cost 29.9 22.5 Income taxes payable 31.1 87.3 Accrued restructuring 39.8 25.4 Other current liabilities 219.5 197.4 Total other current liabilities $ 517.1 $ 511.5 Other non-current liabilities Income taxes payable $ 92.7 $ 36.1 Self-insurance liabilities 48.3 49.8 Deferred compensation plan liabilities 49.4 47.9 Foreign currency contract liabilities 47.2 5.4 Other non-current liabilities 37.8 22.8 Total other non-current liabilities $ 275.4 $ 162.0

Supplemental Cash Flow Inform36

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Disclosure of Cash Flow Information	Years ended December 31 In millions 2017 2016 2015 Cash paid for interest, net $ 107.2 $ 143.4 $ 76.9 Cash paid for income taxes, net 362.1 145.1 182.8

Accumulated Other Comprehensi37

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	Components of AOCI consist of the following: December 31 In millions 2017 2016 Cumulative translation adjustments $ (221.4 ) $ (718.9 ) Change in market value of derivative financial instruments, net of tax (22.0 ) (17.4 ) Accumulated other comprehensive loss $ (243.4 ) $ (736.3 )

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt and Average Interest Rates on Debt Outstanding	Debt and the average interest rates on debt outstanding were as follows: In millions Average Maturity year December 31 December 31, 2017 2017 2016 Commercial paper 2.340% 2019 $ 34.0 $ 398.7 Revolving credit facilities 3.064% 2019 28.4 576.8 Senior notes - fixed rate (1) 1.875% 2017 — 350.0 Senior notes - fixed rate (1) 2.900% 2018 255.3 500.0 Senior notes - fixed rate (1) 2.650% 2019 250.0 250.0 Senior notes - fixed rate - Euro (1) 2.450% 2019 594.4 520.7 Senior notes - fixed rate (1) 3.625% 2020 74.0 400.0 Senior notes - fixed rate (1) 5.000% 2021 103.8 500.0 Senior notes - fixed rate (1) 3.150% 2022 88.3 550.0 Senior notes - fixed rate (1) 4.650% 2025 19.3 250.0 Other N/A N/A — 0.8 Unamortized issuance costs and discounts N/A N/A (6.8 ) (17.8 ) Total debt 1,440.7 4,279.2 Less: Current maturities and short-term borrowings — (0.8 ) Long-term debt $ 1,440.7 $ 4,278.4 (1) Senior notes guaranteed as to payment by Pentair plc and PISG ("the Notes")
Debt Outstanding Matures on Calendar Year Basis	Debt outstanding, excluding unamortized issuance costs and discounts , at December 31, 2017 matures on a calendar year basis as follows: In millions 2018 2019 2020 2021 2022 Thereafter Total Contractual debt obligation maturities $ — $ 1,162.1 $ 74.0 $ 103.8 $ 88.3 $ 19.3 $ 1,447.5

Derivatives and Financial Ins39

Derivatives and Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments	The recorded amounts and estimated fair values of total debt, excluding unamortized issuance costs and discounts , at December 31 were as follows: 2017 2016 In millions Recorded Fair Value Recorded Fair Value Variable rate debt $ 62.4 $ 62.4 $ 976.3 $ 976.3 Fixed rate debt 1,385.1 1,424.0 3,320.7 3,427.1 Total debt $ 1,447.5 $ 1,486.4 $ 4,297.0 $ 4,403.4
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	Financial assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows: Recurring fair value measurements December 31, 2017 In millions Level 1 Level 2 Level 3 Total Foreign currency contract assets $ — $ 0.6 $ — $ 0.6 Foreign currency contract liabilities — (47.2 ) — (47.2 ) Deferred compensation plan assets 42.8 6.6 — 49.4 Total recurring fair value measurements $ 42.8 $ (40.0 ) $ — $ 2.8 Nonrecurring fair value measurements (1) Recurring fair value measurements December 31, 2016 In millions Level 1 Level 2 Level 3 Total Foreign currency contract assets $ — $ 5.5 $ — $ 5.5 Foreign currency contract liabilities — (5.4 ) — (5.4 ) Deferred compensation plan assets 41.6 6.3 — 47.9 Total recurring fair value measurements $ 41.6 $ 6.4 $ — $ 48.0 Nonrecurring fair value measurements (1)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income (loss) before income taxes and noncontrolling interest	Income from continuing operations before income taxes consisted of the following: Years ended December 31 In millions 2017 2016 2015 Federal (1) $ (32.8 ) $ (25.6 ) $ (21.8 ) International (2) 522.0 586.6 534.3 Income from continuing operations before income taxes $ 489.2 $ 561.0 $ 512.5 (1) "Federal" reflects United Kingdom ("U.K.") income from continuing operations before income taxes. (2) "International" reflects non-U.K. income from continuing operations before income taxes.
Provision for Income Taxes	The provision for income taxes consisted of the following: Years ended December 31 In millions 2017 2016 2015 Currently payable Federal (1) $ 0.5 $ (0.1 ) $ — International (2) 183.8 125.6 117.7 Total current taxes 184.3 125.5 117.7 Deferred Federal (1) — (0.4 ) 1.2 International (2) (175.1 ) (15.7 ) (3.5 ) Total deferred taxes (175.1 ) (16.1 ) (2.3 ) Total provision for income taxes $ 9.2 $ 109.4 $ 115.4 (1) "Federal" represents U.K. taxes. (2) "International" represents non-U.K. taxes.
Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate	Reconciliations of the federal statutory income tax rate to our effective tax rate were as follows: Years ended December 31 Percentages 2017 2016 2015 Federal statutory income tax rate (1) 19.3 20.0 20.3 Tax effect of international operations (2) (11.3 ) (11.8 ) (6.5 ) Change in valuation allowances 8.0 9.7 6.9 Withholding taxes 0.4 0.9 0.6 Interest limitations 0.6 0.6 0.7 Non-deductible transaction costs 0.7 0.1 0.5 Excess tax benefits on stock-based compensation (1.7 ) — — Tax effect of U.S. tax reform (17.3 ) — — Tax effect of early extinguishment of debt 3.2 — — Effective tax rate 1.9 19.5 22.5 (1) The statutory rate for 2017 , 2016 and 2015 reflects the U.K. statutory rate of 19.3% , 20.0% and 20.3% , respectively. (2) The tax effect of international operations consists of non-U.K. jurisdictions.
Reconciliations of Gross Unrecognized Tax Benefits	Reconciliations of the beginning and ending gross unrecognized tax benefits were as follows: Years ended December 31 In millions 2017 2016 2015 Beginning balance $ 71.1 $ 45.6 $ 40.3 Gross increases for tax positions in prior periods 5.3 27.4 4.7 Gross decreases for tax positions in prior periods (5.0 ) (4.8 ) (1.5 ) Gross increases based on tax positions related to the current year 1.8 2.0 1.3 Gross decreases related to settlements with taxing authorities (35.7 ) (3.4 ) (1.9 ) Reductions due to statute expiration (2.2 ) (0.8 ) (1.4 ) Gross (decreases) increases due to currency fluctuations 1.3 (0.2 ) (2.5 ) Gross increases due to acquisitions — 5.3 6.6 Ending balance $ 36.6 $ 71.1 $ 45.6
Deferred Taxes	Deferred taxes were recorded in the Consolidated Balance Sheets as follows: December 31 In millions 2017 2016 Other non-current assets 43.0 39.0 Deferred tax liabilities 394.8 609.5 Net deferred tax liabilities $ 351.8 $ 570.5
Tax Effects of Major Items Recorded as Deferred Tax Assets and Liabilities	The tax effects of the major items recorded as deferred tax assets and liabilities were as follows: December 31 In millions 2017 2016 Deferred tax assets Accrued liabilities and reserves $ 55.2 $ 83.2 Pension and other post-retirement compensation and benefits 53.8 48.9 Employee compensation and benefits 43.5 76.6 Tax loss and credit carryforwards 811.7 391.0 Total deferred tax assets 964.2 599.7 Valuation allowance 792.4 380.8 Deferred tax assets, net of valuation allowance 171.8 218.9 Deferred tax liabilities Property, plant and equipment 16.5 23.6 Goodwill and other intangibles 484.7 733.7 Other liabilities 22.4 32.1 Total deferred tax liabilities 523.6 789.4 Net deferred tax liabilities $ 351.8 $ 570.5

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Reconciliations of Benefit Obligations, Plan Assets of Pension Plans and Funded Status of Plans	The following tables present reconciliations of plan benefit obligations, fair value of plan assets and the funded status of pension plans and other post-retirement plans as of and for the years ended December 31, 2017 and 2016 : U.S. pension plans Non-U.S. pension plans Other post-retirement plans In millions 2017 2016 2017 2016 2017 2016 Change in benefit obligations Benefit obligation beginning of year $ 413.3 $ 396.9 $ 186.8 $ 173.4 $ 36.9 $ 38.8 Service cost 10.3 11.2 8.0 6.6 0.2 0.2 Interest cost 16.3 16.4 4.2 4.1 1.3 1.5 Actuarial loss (gain) 40.0 0.9 (8.5 ) 16.8 0.2 (0.5 ) Foreign currency translation — — 23.7 (9.2 ) — — Benefits paid (16.9 ) (12.1 ) (7.0 ) (4.9 ) (3.0 ) (3.1 ) Benefit obligation end of year $ 463.0 $ 413.3 $ 207.2 $ 186.8 $ 35.6 $ 36.9 Change in plan assets Fair value of plan assets beginning of year $ 344.4 $ 327.7 $ 45.7 $ 46.6 $ — $ — Actual return on plan assets 42.4 24.6 2.1 3.0 — — Company contributions 4.6 4.2 8.2 5.8 2.9 3.1 Foreign currency translation — — 3.7 (4.8 ) — — Benefits paid (16.9 ) (12.1 ) (8.5 ) (4.9 ) (2.9 ) (3.1 ) Fair value of plan assets end of year $ 374.5 $ 344.4 $ 51.2 $ 45.7 $ — $ — Funded status Benefit obligations in excess of the fair value of plan assets $ (88.5 ) $ (68.9 ) $ (156.0 ) $ (141.1 ) $ (35.6 ) $ (36.9 )
Amounts Recognized in Consolidated Balance Sheets	Amounts recorded in the Consolidated Balance Sheets were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement plans In millions 2017 2016 2017 2016 2017 2016 Other non-current assets $ — $ 0.8 $ 3.8 $ 3.2 $ — $ — Current liabilities (6.0 ) (4.4 ) (3.6 ) (2.9 ) (3.1 ) (3.2 ) Non-current liabilities (82.5 ) (65.3 ) (156.2 ) (141.4 ) (32.5 ) (33.7 ) Benefit obligations in excess of the fair value of plan assets $ (88.5 ) $ (68.9 ) $ (156.0 ) $ (141.1 ) $ (35.6 ) $ (36.9 )
Pension Plans with an Accumulated Benefit Obligation or Projected Benefit Obligation in Excess of Plan Assets	Information for pension plans with an accumulated benefit obligation or projected benefit obligation in excess of plan assets as of December 31 was as follows: Projected benefit obligation exceeds the fair value of plan assets Accumulated benefit obligation exceeds the fair value of plan assets In millions 2017 2016 2017 2016 U.S. pension plans Projected benefit obligation $ 463.0 $ 87.2 $ 463.0 $ 87.2 Fair value of plan assets 374.5 17.5 374.5 17.5 Accumulated benefit obligation N/A N/A 460.3 86.3 Non-U.S. pension plans Projected benefit obligation $ 182.4 $ 165.2 $ 170.3 $ 165.2 Fair value of plan assets 22.6 20.9 11.4 20.9 Accumulated benefit obligation NA NA 160.5 155.7
Components of Net Periodic Benefit Cost	Components of net periodic benefit expense for our pension plans for the years ended December 31 were as follows: U.S. pension plans Non-U.S. pension plans In millions 2017 2016 2015 2017 2016 2015 Service cost $ 10.3 $ 11.2 $ 14.0 $ 8.0 $ 6.6 $ 7.8 Interest cost 16.3 16.4 14.9 4.2 4.1 3.9 Expected return on plan assets (11.5 ) (11.4 ) (10.0 ) (1.5 ) (1.5 ) (1.6 ) Net actuarial (gain) loss 9.1 (12.4 ) (18.0 ) (7.4 ) 17.2 (2.4 ) Net periodic benefit expense $ 24.2 $ 3.8 $ 0.9 $ 3.3 $ 26.4 $ 7.7
Weighted-Average Assumptions used to Determine Domestic Benefit Obligations and Domestic Net Periodic Benefit Cost	Weighted-average assumptions used to determine net periodic benefit expense (income) for years ended December 31 were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement Percentages 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.02 % 4.21 % 3.63 % 2.00 % 2.52 % 2.30 % 3.80 % 3.95 % 3.60 % Expected long-term return on plan assets 4.11 % 4.28 % 3.65 % 3.02 % 3.29 % 3.57 % — — — Rate of compensation increase 4.00 % 4.00 % 4.00 % 2.91 % 2.90 % 2.89 % — — — Weighted-average assumptions used to determine benefit obligations as of December 31 were as follows: U.S. pension plans Non-U.S. pension plans Other post-retirement Percentages 2017 (1) 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 3.39 % 4.02 % 4.21 % 2.18 % 2.00 % 2.52 % 3.40 % 3.80 % 3.95 % Rate of compensation increase 4.00 % 4.00 % 4.00 % 2.93 % 2.91 % 2.90 % — — —
Assumed Health Care Cost Trend Rates	The assumed healthcare cost trend rates for other post-retirement plans as of December 31 were as follows: 2017 2016 Healthcare cost trend rate assumed for following year 6.6 % 7.0 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.4 % 4.4 % Year the cost trend rate reaches the ultimate trend rate 2038 2038
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates	A one-percentage-point change in the assumed healthcare cost trend rates would have the following effects as of and for the year ended December 31, 2017 : One Percentage Point In millions Increase Decrease Increase (decrease) in annual service and interest cost $ 0.1 $ (0.1 ) Increase (decrease) in other post-retirement benefit obligations 0.7 (0.6 )
Actual Overall Asset Allocation for U.S. And Non-U.S. Plans as Compared to Investment Policy Goals	Our actual overall asset allocation for our U.S. and non-U.S. pension plans as compared to our investment policy goals as of December 31 was as follows: U.S. pension plans Actual Target Percentages 2017 2016 2017 2016 Fixed income 99 % 99 % 100 % 100 % Alternative 1 % 1 % — % — % Non-U.S. pension plans Actual Target Percentages 2017 2016 2017 2016 Equity securities 22 % 23 % 24 % 23 % Fixed income 53 % 46 % 51 % 48 % Alternative 22 % 26 % 23 % 27 % Cash 3 % 5 % 2 % 2 %
Plan Assets Using Fair Value Hierarchy	The fair values of our pension plan assets and their respective levels in the fair value hierarchy as of December 31, 2017 and December 31, 2016 were as follows: December 31, 2017 In millions Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 2.8 $ — $ 2.8 Fixed income: Corporate and non U.S. government — 289.5 — 289.5 U.S. treasuries — 43.2 — 43.2 Mortgage-backed securities — 3.3 — 3.3 Other — 63.1 — 63.1 Global equity securities: Small cap equity — 1.2 — 1.2 International equity — 10.2 — 10.2 Other investments — 11.3 1.1 12.4 Total fair value of plan assets $ — $ 424.6 $ 1.1 $ 425.7 December 31, 2016 In millions Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 3.4 $ — $ 3.4 Fixed income: Corporate and non U.S. government — 290.5 — 290.5 U.S. treasuries — 30.5 — 30.5 Mortgage-backed securities — 4.5 — 4.5 Other — 37.0 — 37.0 Global equity securities: Large cap equity — 2.2 — 2.2 International equity — 8.3 — 8.3 Other investments — 11.7 2.0 13.7 Total fair value of plan assets $ — $ 388.1 $ 2.0 $ 390.1
Expected Future Service to Be Paid by Plans	The following benefit payments, which reflect expected future service or payout from termination, as appropriate, are expected to be paid by the plans for the years ended December 31 as follows: In millions U.S. pension plans Non-U.S. pension plans Other post- retirement plans 2018 $ 203.7 $ 5.2 $ 3.1 2019 178.3 5.8 3.0 2020 6.7 5.5 2.9 2021 6.7 6.1 2.8 2022 6.8 6.3 2.7 Thereafter 33.6 41.1 11.7

Share Plans (Tables)

Share Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	Total share-based compensation expense for 2017 , 2016 and 2015 was as follows: December 31 In millions 2017 2016 2015 Restricted stock units $ 17.5 $ 17.3 $ 21.6 Stock options 10.5 10.4 11.4 Performance share units 11.6 6.5 — Total share-based compensation expense $ 39.6 $ 34.2 $ 33.0
Stock Option Activity	The following table summarizes stock option activity under all plans for the year ended December 31, 2017 : Shares and intrinsic value in millions Number of shares Weighted- average exercise price Weighted- average remaining contractual life (years) Aggregate intrinsic value Outstanding as of January 1, 2017 5.7 $ 45.72 Granted 0.9 59.09 Exercised (1.2 ) 37.00 Forfeited (0.2 ) 60.03 Expired — — Outstanding as of December 31, 2017 5.2 $ 49.49 5.5 $ 113.7 Options exercisable as of December 31, 2017 3.4 $ 46.00 4.0 $ 87.5 Options expected to vest as of December 31, 2017 1.8 $ 56.13 8.3 $ 25.8
Stock Option Fair Value Assumptions	We estimated the fair value of each stock option award on the date of grant using a Black-Scholes option pricing model, modified for dividends and using the following weighted average assumptions: December 31 2017 2016 2015 Risk-free interest rate 1.65 % 1.56 % 1.60 % Expected dividend yield 2.35 % 2.49 % 1.97 % Expected share price volatility 26.9 % 27.3 % 30.4 % Expected term (years) 6.3 5.9 6.0
Restricted Stock Activity	The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2017 : Shares in millions Number of shares Weighted average grant date fair value Outstanding as of January 1, 2017 0.7 $ 55.31 Granted 0.4 61.27 Vested (0.4 ) 56.73 Forfeited (0.1 ) 54.35 Outstanding as of December 31, 2017 0.6 $ 57.96
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]	The following table summarizes performance share unit activity under all plans for the year ended December 31, 2017 : Shares in millions Number of shares Weighted average grant date fair value Outstanding as of January 1, 2017 0.3 $ 49.54 Granted 0.2 58.40 Vested — — Forfeited — — Outstanding as of December 31, 2017 0.5 $ 53.56

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Financial Information by Reportable Business Segment	Financial information by reportable segment is included in the following summary: 2017 2016 2015 2017 2016 2015 In millions Net sales Segment income (loss) Water $ 2,844.4 $ 2,777.7 $ 2,808.3 $ 546.0 $ 494.0 $ 469.0 Electrical 2,097.9 2,116.0 1,809.3 447.0 447.2 395.0 Other (5.8 ) (3.7 ) (1.2 ) (95.8 ) (101.7 ) (108.8 ) Consolidated $ 4,936.5 $ 4,890.0 $ 4,616.4 $ 897.2 $ 839.5 $ 755.2 2017 2016 2015 2017 2016 2015 In millions Identifiable assets (1) Depreciation Water $ 3,667.1 $ 3,465.5 $ 3,624.5 $ 45.6 $ 46.8 $ 45.3 Electrical 4,634.1 4,419.3 4,488.4 34.3 31.6 27.6 Other 332.5 3,650.0 3,720.6 5.3 6.2 8.3 Consolidated $ 8,633.7 $ 11,534.8 $ 11,833.5 $ 85.2 $ 84.6 $ 81.2 2017 2016 2015 In millions Capital expenditures Water $ 36.1 $ 40.8 $ 41.5 Electrical 31.8 74.5 47.4 Other 3.0 2.5 2.4 Consolidated $ 70.9 $ 117.8 $ 91.3 (1) All cash and cash equivalents and assets held for sale are included in "Other."
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	The following table presents a reconciliation of consolidated segment income to consolidated i ncome from continuing operations before income taxes: In millions 2017 2016 2015 Segment income $ 897.2 $ 839.5 $ 755.2 Deal related costs and expenses — — (14.3 ) Inventory step-up — — (35.7 ) Restructuring and other (30.7 ) (20.6 ) (42.5 ) Separation costs (53.1 ) — — Intangible amortization (97.7 ) (96.4 ) (68.1 ) Pension and other post-retirement mark-to-market (loss) gain (1.6 ) (4.2 ) 23.0 Trade name and other impairment (32.0 ) (13.3 ) — Loss on sale of businesses (4.2 ) (3.9 ) (3.2 ) Loss on early extinguishment of debt (101.4 ) — — Interest expense, net (87.3 ) (140.1 ) (101.9 ) Income from continuing operations before income taxes $ 489.2 $ 561.0 $ 512.5
Geographic Information	The following tables present certain geographic information by region: 2017 2016 2015 2017 2016 2015 In millions Net sales Long-lived assets U.S. $ 2,973.7 $ 2,897.1 $ 2,634.0 $ 301.4 $ 309.5 $ 285.9 Western Europe 827.2 796.0 727.6 61.7 138.6 150.7 Developing (1) 723.7 704.0 731.6 157.1 65.2 60.3 Other Developed (2) 411.9 492.9 523.2 25.3 25.3 42.9 Consolidated $ 4,936.5 $ 4,890.0 $ 4,616.4 $ 545.5 $ 538.6 $ 539.8 (1) - Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia. (2) - Other Developed includes Australia, Canada and Japan.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Net rental expense	Net rental expense under operating leases was as follows: Years ended December 31 In millions 2017 2016 2015 Gross rental expense $ 40.4 $ 37.5 $ 26.4 Sublease rental income (0.3 ) (0.7 ) (0.4 ) Net rental expense $ 40.1 $ 36.8 $ 26.0
Net future minimum lease commitments	Future minimum lease commitments under non-cancelable operating leases, principally related to facilities, machinery, equipment and vehicles as of December 31, 2017 were as follows: In millions 2018 2019 2020 2021 2022 Thereafter Total Minimum lease payments $ 34.3 $ 29.1 $ 21.2 $ 15.6 $ 13.1 $ 15.1 $ 128.4 Minimum sublease rentals (0.3 ) — — — — — (0.3 ) Net future minimum lease commitments $ 34.0 $ 29.1 $ 21.2 $ 15.6 $ 13.1 $ 15.1 $ 128.1
Changes in Carrying Amount of Service and Product Warranties	The changes in the carrying amount of service and product warranties for the years ended December 31, 2017 and 2016 were as follows: Years ended December 31 In millions 2017 2016 Beginning balance $ 38.9 $ 47.0 Service and product warranty provision 64.1 59.7 Payments (62.7 ) (67.3 ) Foreign currency translation 0.7 (0.5 ) Ending balance $ 41.0 $ 38.9

Selected Quarterly Data (Tables

Selected Quarterly Data (Tables)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Quarterly Financial Information	The following tables present 2017 and 2016 quarterly financial information: 2017 In millions, except per-share data First Quarter Second Quarter Third Quarter Fourth Quarter Full Year Net sales $ 1,183.5 $ 1,265.3 $ 1,226.8 $ 1,260.9 $ 4,936.5 Gross profit 422.3 483.2 455.3 468.3 1,829.1 Operating income 138.4 212.8 192.2 137.4 680.8 Net income from continuing operations 80.7 68.3 127.1 203.9 480.0 Income (loss) from discontinued operations, net of tax 7.1 (5.2 ) — 3.5 5.4 Gain (loss) from sale of discontinued operations, net of tax — 200.6 (1.7 ) (17.8 ) 181.1 Net income 87.8 263.7 125.4 189.6 666.5 Earnings per ordinary share (1) Basic Continuing operations $ 0.44 $ 0.38 $ 0.70 $ 1.12 $ 2.64 Discontinued operations 0.04 1.07 (0.01 ) (0.07 ) 1.03 Basic earnings per ordinary share $ 0.48 $ 1.45 $ 0.69 $ 1.05 $ 3.67 Diluted Continuing operations $ 0.44 $ 0.37 $ 0.69 $ 1.11 $ 2.61 Discontinued operations 0.04 1.06 (0.01 ) (0.07 ) 1.02 Diluted earnings per ordinary share $ 0.48 $ 1.43 $ 0.68 $ 1.04 $ 3.63 2016 In millions, except per-share data First Quarter Second Quarter Third Quarter Fourth Quarter Full Year Net sales $ 1,190.0 $ 1,301.2 $ 1,210.7 $ 1,188.1 $ 4,890.0 Gross profit 431.3 481.8 440.9 440.1 1,794.1 Operating income 152.7 203.4 182.8 161.8 700.7 Net income from continuing operations 91.8 132.7 117.5 109.6 451.6 Income from discontinued operations, net of tax 15.6 10.1 22.9 21.4 70.0 Gain from sale of discontinued operations, net of tax — — 0.6 — 0.6 Net income 107.4 142.8 141.0 131.0 522.2 Earnings per ordinary share (1) Basic Continuing operations $ 0.50 $ 0.73 $ 0.65 $ 0.60 $ 2.49 Discontinued operations 0.09 0.06 0.13 0.12 0.39 Basic earnings per ordinary share $ 0.59 $ 0.79 $ 0.78 $ 0.72 $ 2.88 Diluted Continuing operations $ 0.50 $ 0.73 $ 0.64 $ 0.60 $ 2.47 Discontinued operations 0.09 0.05 0.13 0.11 0.38 Diluted earnings per ordinary share $ 0.59 $ 0.78 $ 0.77 $ 0.71 $ 2.85 (1) Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period.

Financial Statements of Paren46

Financial Statements of Parent Company Guarantor (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)	Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2015 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,616.4 $ — $ 4,616.4 Cost of goods sold — — — 3,017.6 — 3,017.6 Gross profit — — — 1,598.8 — 1,598.8 Selling, general and administrative 33.7 2.2 5.3 842.8 — 884 Research and development — — — 98.7 — 98.7 Operating (loss) income (33.7 ) (2.2 ) (5.3 ) 657.3 — 616.1 Loss (earnings) from continuing operations of investment in subsidiaries (436.1 ) (439.7 ) (475.1 ) — 1,350.9 — Other (income) expense: Loss on sale of businesses — — — 3.2 — 3.2 Equity income of unconsolidated subsidiaries — — — (1.5 ) — (1.5 ) Interest income — — (80.6 ) (33.8 ) 109.7 (4.7 ) Interest expense — 1.4 126.3 88.6 (109.7 ) 106.6 Income (loss) from continuing operations before income taxes 402.4 436.1 424.1 600.8 (1,350.9 ) 512.5 Provision for income taxes 5.3 — — 110.1 — 115.4 Net income (loss) from continuing operations 397.1 436.1 424.1 490.7 (1,350.9 ) 397.1 Loss from discontinued operations, net of tax — — — (466.8 ) — (466.8 ) Loss from sale of discontinued operations, net of tax — — — (6.7 ) — (6.7 ) Earnings (loss) from discontinued operations of investment in subsidiaries (473.5 ) (473.5 ) (473.5 ) — 1,420.5 — Net income (loss) $ (76.4 ) $ (37.4 ) $ (49.4 ) $ 17.2 $ 69.6 $ (76.4 ) Comprehensive income (loss), net of tax Net income (loss) $ (76.4 ) $ (37.4 ) $ (49.4 ) $ 17.2 $ 69.6 $ (76.4 ) Changes in cumulative translation adjustment (264.9 ) (264.9 ) (264.9 ) (264.9 ) 794.7 (264.9 ) Changes in market value of derivative financial instruments, net of tax 0.2 0.2 0.2 0.2 (0.6 ) 0.2 Comprehensive income (loss) $ (341.1 ) $ (302.1 ) $ (314.1 ) $ (247.5 ) $ 863.7 $ (341.1 ) Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,890.0 $ — $ 4,890.0 Cost of goods sold — — — 3,095.9 — 3,095.9 Gross profit — — — 1,794.1 — 1,794.1 Selling, general and administrative 15.8 — 1.2 962.3 — 979.3 Research and development — — — 114.1 — 114.1 Operating (loss) income (15.8 ) — (1.2 ) 717.7 — 700.7 Loss (earnings) from continuing operations of investment in subsidiaries (466.0 ) (466.0 ) (578.1 ) — 1,510.1 — Other (income) expense: Loss on sale of businesses — — — 3.9 — 3.9 Equity income of unconsolidated subsidiaries — — — (4.3 ) — (4.3 ) Interest income — — (70.3 ) (54.5 ) 116.5 (8.3 ) Interest expense — — 181.2 83.7 (116.5 ) 148.4 Income (loss) from continuing operations before income taxes 450.2 466.0 466.0 688.9 (1,510.1 ) 561.0 Provision (benefit) for income taxes (1.4 ) — — 110.8 — 109.4 Net income (loss) from continuing operations 451.6 466.0 466.0 578.1 (1,510.1 ) 451.6 Income from discontinued operations, net of tax — — — 70.0 — 70.0 Gain from sale of discontinued operations, net of tax — — — 0.6 — 0.6 Earnings (loss) from discontinued operations of investment in subsidiaries 70.6 70.6 70.6 — (211.8 ) — Net income (loss) $ 522.2 $ 536.6 $ 536.6 $ 648.7 $ (1,721.9 ) $ 522.2 Comprehensive income (loss), net of tax Net income (loss) $ 522.2 $ 536.6 $ 536.6 $ 648.7 $ (1,721.9 ) $ 522.2 Changes in cumulative translation adjustment (83.0 ) (83.0 ) (83.0 ) (83.0 ) 249.0 (83.0 ) Changes in market value of derivative financial instruments, net of tax (8.3 ) (8.3 ) (8.3 ) (8.3 ) 24.9 (8.3 ) Comprehensive income (loss) $ 430.9 $ 445.3 $ 445.3 $ 557.4 $ (1,448.0 ) $ 430.9 Pentair plc and Subsidiaries Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Year Ended December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ — $ 4,936.5 $ — $ 4,936.5 Cost of goods sold — — — 3,107.4 — 3,107.4 Gross profit — — — 1,829.1 — 1,829.1 Selling, general and administrative 4.1 0.6 — 1,027.8 — 1,032.5 Research and development — — — 115.8 — 115.8 Operating (loss) income (4.1 ) (0.6 ) — 685.5 — 680.8 Loss (earnings) from continuing operations of investment in subsidiaries (483.2 ) (482.6 ) (644.4 ) — 1,610.2 — Other (income) expense: Loss on sale of businesses — — — 4.2 — 4.2 Loss on early extinguishment of debt — — 91.0 10.4 — 101.4 Equity income of unconsolidated subsidiaries — — — (1.3 ) — (1.3 ) Interest income — (0.6 ) (69.2 ) (63.7 ) 123.6 (9.9 ) Interest expense — — 139.9 80.9 (123.6 ) 97.2 Income (loss) from continuing operations before income taxes 479.1 482.6 482.7 655.0 (1,610.2 ) 489.2 Provision (benefit) for income taxes (0.9 ) — — 10.1 — 9.2 Net income (loss) from continuing operations 480.0 482.6 482.7 644.9 (1,610.2 ) 480.0 Income from discontinued operations, net of tax — — — 5.4 — 5.4 Gain from sale of discontinued operations, net of tax — — — 181.1 — 181.1 Earnings (loss) from discontinued operations of investment in subsidiaries 186.5 186.5 186.5 — (559.5 ) — Net income (loss) $ 666.5 $ 669.1 $ 669.2 $ 831.4 $ (2,169.7 ) $ 666.5 Comprehensive income (loss), net of tax Net income (loss) $ 666.5 $ 669.1 $ 669.2 $ 831.4 $ (2,169.7 ) $ 666.5 Changes in cumulative translation adjustment 497.5 497.5 497.5 497.5 (1,492.5 ) 497.5 Changes in market value of derivative financial instruments, net of tax (4.6 ) (4.6 ) (4.6 ) (4.6 ) 13.8 (4.6 ) Comprehensive income (loss) $ 1,159.4 $ 1,162.0 $ 1,162.1 $ 1,324.3 $ (3,648.4 ) $ 1,159.4
Condensed Consolidating Balance Sheet	Pentair plc and Subsidiaries Condensed Consolidating Balance Sheet December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Assets Current assets Cash and cash equivalents $ — $ — $ — $ 238.5 $ — $ 238.5 Accounts and notes receivable, net 0.1 — — 763.9 — 764.0 Inventories — — — 524.2 — 524.2 Other current assets 1.2 4.1 1.1 237.8 9.2 253.4 Current assets held for sale — — — 891.9 — 891.9 Total current assets 1.3 4.1 1.1 2,656.3 9.2 2,672.0 Property, plant and equipment, net — — — 538.6 — 538.6 Other assets Investments in subsidiaries 4,509.5 4,471.4 9,295.5 — (18,276.4 ) — Goodwill — — — 4,217.4 — 4,217.4 Intangibles, net — — — 1,631.8 — 1,631.8 Other non-current assets 2.2 35.2 717.8 1,568.9 (2,142.0 ) 182.1 Non-current assets held for sale — — — 2,292.9 — 2,292.9 Total other assets 4,511.7 4,506.6 10,013.3 9,711.0 (20,418.4 ) 8,324.2 Total assets $ 4,513.0 $ 4,510.7 $ 10,014.4 $ 12,905.9 $ (20,409.2 ) $ 11,534.8 Liabilities and Equity Current liabilities Current maturities of long-term debt and short-term borrowings $ — $ — $ — $ 0.8 $ — $ 0.8 Accounts payable $ 0.7 $ — $ 0.1 $ 435.8 $ — $ 436.6 Employee compensation and benefits 0.8 — — 165.3 — 166.1 Other current liabilities 95.2 1.2 26.7 379.2 9.2 511.5 Current liabilities held for sale — — — 356.2 — 356.2 Total current liabilities 96.7 1.2 26.8 1,337.3 9.2 1,471.2 Other liabilities Long-term debt 148.1 — 5,515.9 756.4 (2,142.0 ) 4,278.4 Pension and other post-retirement compensation and benefits — — — 253.4 — 253.4 Deferred tax liabilities — — — 609.5 — 609.5 Other non-current liabilities 13.8 — — 148.2 — 162.0 Non-current liabilities held for sale — — — 505.9 — 505.9 Total liabilities 258.6 1.2 5,542.7 3,610.7 (2,132.8 ) 7,280.4 Equity 4,254.4 4,509.5 4,471.7 9,295.2 (18,276.4 ) 4,254.4 Total liabilities and equity $ 4,513.0 $ 4,510.7 $ 10,014.4 $ 12,905.9 $ (20,409.2 ) $ 11,534.8 Pentair plc and Subsidiaries Condensed Consolidating Balance Sheet December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Assets Current assets Cash and cash equivalents $ — $ — $ — $ 113.3 $ — $ 113.3 Accounts and notes receivable, net — — — 831.6 — 831.6 Inventories — — — 581.0 — 581.0 Other current assets 10.8 1.8 1.5 239.3 (30.5 ) 222.9 Total current assets 10.8 1.8 1.5 1,765.2 (30.5 ) 1,748.8 Property, plant and equipment, net — — — 545.5 — 545.5 Other assets Investments in subsidiaries 5,205.1 5,109.6 7,156.1 — (17,470.8 ) — Goodwill — — — 4,351.1 — 4,351.1 Intangibles, net — — — 1,558.4 — 1,558.4 Long-term intercompany debt — 94.1 614.0 (708.1 ) — — Other non-current assets 2.2 — — 2,317.1 (1,889.4 ) 429.9 Total other assets 5,207.3 5,203.7 7,770.1 7,518.5 (19,360.2 ) 6,339.4 Total assets $ 5,218.1 $ 5,205.5 $ 7,771.6 $ 9,829.2 $ (19,390.7 ) $ 8,633.7 Liabilities and Equity Current liabilities Accounts payable 1.4 — — 494.3 — 495.7 Employee compensation and benefits 0.4 — — 186.2 — 186.6 Other current liabilities 99.6 0.4 9.4 438.2 (30.5 ) 517.1 Total current liabilities 101.4 0.4 9.4 1,118.7 (30.5 ) 1,199.4 Other liabilities Long-term debt 48.4 — 2,652.8 628.9 (1,889.4 ) 1,440.7 Pension and other post-retirement compensation and benefits — — — 285.6 — 285.6 Deferred tax liabilities — — — 394.8 — 394.8 Other non-current liabilities 30.5 — — 244.9 — 275.4 Total liabilities 180.3 0.4 2,662.2 2,672.9 (1,919.9 ) 3,595.9 Equity 5,037.8 5,205.1 5,109.4 7,156.3 (17,470.8 ) 5,037.8 Total liabilities and equity $ 5,218.1 $ 5,205.5 $ 7,771.6 $ 9,829.2 $ (19,390.7 ) $ 8,633.7
Condensed Consolidating Statement of Cash Flows	Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2017 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ 677.0 $ 670.6 $ 661.3 $ 781.0 $ (2,169.7 ) $ 620.2 Investing activities Capital expenditures — — — (70.9 ) — (70.9 ) Proceeds from sale of property and equipment — — — 7.9 — 7.9 Proceeds from sale of businesses — — 2,765.6 (6.2 ) — 2,759.4 Acquisitions, net of cash acquired — — — (59.5 ) — (59.5 ) Net intercompany loan activity — (58.9 ) 103.7 172.6 (217.4 ) — Net cash provided by (used for) investing activities of continuing operations — (58.9 ) 2,869.3 43.9 (217.4 ) 2,636.9 Net cash provided by (used for) investing activities of discontinued operations — — — (6.5 ) — (6.5 ) Net cash provided by (used for) investing activities — (58.9 ) 2,869.3 37.4 (217.4 ) 2,630.4 Financing activities Net repayments of short-term borrowings — — — (0.8 ) — (0.8 ) Net receipts (repayments) of commercial paper and revolving long-term debt — — (914.7 ) 1.6 — (913.1 ) Repayment of long-term debt — — (1,917.8 ) (91.5 ) — (2,009.3 ) Premium paid on early extinguishment of debt — — (86.0 ) (8.9 ) — (94.9 ) Net change in advances to subsidiaries (262.5 ) (611.7 ) (685.9 ) (827.0 ) 2,387.1 — Shares issued to employees, net of shares withheld 37.2 — — — — 37.2 Repurchases of ordinary shares (200.0 ) — — — — (200.0 ) Dividends paid (251.7 ) — — — — (251.7 ) Net cash provided by (used for) financing activities (677.0 ) (611.7 ) (3,604.4 ) (926.6 ) 2,387.1 (3,432.6 ) Effect of exchange rate changes on cash and cash equivalents — — 73.8 (17.0 ) — 56.8 Change in cash and cash equivalents — — — (125.2 ) — (125.2 ) Cash and cash equivalents, beginning of year — — — 238.5 — 238.5 Cash and cash equivalents, end of year $ — $ — $ — $ 113.3 $ — $ 113.3 Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2015 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ (43.0 ) $ (48.7 ) $ (5.8 ) $ 767.1 $ 69.7 $ 739.3 Investing activities Capital expenditures — — — (91.3 ) — (91.3 ) Proceeds from sale of property and equipment — — — 4.6 — 4.6 Acquisitions, net of cash acquired — — — (1,913.9 ) — (1,913.9 ) Net intercompany loan activity — — 891.0 (295.0 ) (596.0 ) — Proceeds from sale of businesses and other — — — (3.0 ) — (3.0 ) Net cash provided by (used for) investing activities of continuing operations — — 891.0 (2,298.6 ) (596.0 ) (2,003.6 ) Net cash provided by (used for) investing activities of discontinued operations — — — 38.1 — 38.1 Net cash provided by (used for) investing activities — — 891.0 (2,260.5 ) (596.0 ) (1,965.5 ) Financing activities Net repayments on short-term borrowings — — — (2.3 ) — (2.3 ) Net receipts of commercial paper and revolving long-term debt — — 346.9 16.6 — 363.5 Proceeds from long-term debt — — 1,714.8 — — 1,714.8 Repayment of long-term debt — — (350.0 ) (6.6 ) — (356.6 ) Debt issuance costs — — (26.8 ) — — (26.8 ) Net change in advances to subsidiaries 471.7 48.7 (2,553.7 ) 1,507.0 526.3 — Excess tax benefits from share-based compensation — — — 6.0 — 6.0 Shares issued to employees, net of shares withheld 3.0 — — 16.4 — 19.4 Repurchases of ordinary shares (200.0 ) — — — — (200.0 ) Dividends paid (231.7 ) — — — — (231.7 ) Net cash provided by (used for) financing activities 43.0 48.7 (868.8 ) 1,537.1 526.3 1,286.3 Effect of exchange rate changes on cash and cash equivalents — — (16.4 ) (27.8 ) — (44.2 ) Change in cash and cash equivalents — — — 15.9 — 15.9 Cash and cash equivalents, beginning of year — — 0.1 110.3 — 110.4 Cash and cash equivalents, end of year $ — $ — $ 0.1 $ 126.2 $ — $ 126.3 Pentair plc and Subsidiaries Condensed Consolidating Statement of Cash Flows Year Ended December 31, 2016 In millions Parent Company Guarantor Subsidiary Guarantor Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Total Operating activities Net cash provided by (used for) operating activities $ 522.7 $ 463.1 $ 469.5 $ 916.2 $ (1,510.1 ) $ 861.4 Investing activities Capital expenditures — — — (117.8 ) — (117.8 ) Proceeds from sale of property and equipment — — — 24.7 — 24.7 Proceeds from sale of businesses, net — — — (5.2 ) — (5.2 ) Acquisitions, net of cash acquired — — — (25.0 ) — (25.0 ) Net intercompany loan activity — — 667.3 (191.0 ) (476.3 ) — Net cash provided by (used for) investing activities of continuing operations — — 667.3 (314.3 ) (476.3 ) (123.3 ) Net cash provided by (used for) investing activities from discontinued operations — — — 1.5 — 1.5 Net cash provided by (used for) investing activities — — 667.3 (312.8 ) (476.3 ) (121.8 ) Financing activities Net receipts of short-term borrowings — — — 0.8 — 0.8 Net receipts (repayments) of commercial paper and revolving long-term debt — — (385.8 ) 0.5 — (385.3 ) Repayment of long-term debt — — — (0.7 ) — (0.7 ) Net change in advances to subsidiaries (299.8 ) (463.1 ) (778.9 ) (444.6 ) 1,986.4 — Excess tax benefits from share-based compensation — — — 8.0 — 8.0 Shares issued to employees, net of shares withheld 20.7 — — — — 20.7 Dividends paid (243.6 ) — — — — (243.6 ) Net cash provided by (used for) financing activities (522.7 ) (463.1 ) (1,164.7 ) (436.0 ) 1,986.4 (600.1 ) Effect of exchange rate changes on cash and cash equivalents — — 27.8 (55.1 ) — (27.3 ) Change in cash and cash equivalents — — (0.1 ) 112.3 — 112.2 Cash and cash equivalents, beginning of year — — 0.1 126.2 — 126.3 Cash and cash equivalents, end of year $ — $ — $ — $ 238.5 $ — $ 238.5

Basis of Presentation and Sum47

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)Person	Dec. 31, 2017USD ($)Person	Dec. 31, 2016USD ($)Person	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Significant Accounting Policies
Unamortized Debt Issuance Expense	$ 17,800,000	$ 6,800,000	$ 17,800,000
Impairment of Long-Lived Assets Held-for-use				$ 5,100,000
Revenue Recognition
Cost in excess of billings	107,700,000	121,400,000	107,700,000
Billings in excess of cost	22,500,000	29,900,000	22,500,000
Research and development
Research and development		$ 115,800,000	114,100,000	98,700,000
Goodwill and identifiable intangible assets
Goodwill planning period		6 years
Perpetual growth rate		3.00%
Discounted cash flows discount rate		9.00%
Impairment charges, related to trade names	13,300,000				$ 0
Insurance subsidiary
Reserve for policy claims	63,000,000	$ 61,500,000	63,000,000
Other Current Liabilities
Insurance subsidiary
Reserve for policy claims	13,200,000	13,200,000	13,200,000
Other Noncurrent Liabilities
Insurance subsidiary
Reserve for policy claims	$ 49,800,000	$ 48,300,000	$ 49,800,000
Valves And Controls [Member]
Goodwill and identifiable intangible assets
Goodwill, Impairment Loss				515,200,000
Impairment charges, related to trade names				$ 39,500,000
Credit Concentration Risk
Trade receivables and concentration of credit risk
Customer receivable balances to total trade receivables		10.00%	10.00%
Number of customers | Person	0	0	0
Minimum
Basis of presentation
Equity method investment, ownership percentage		20.00%
Maximum
Basis of presentation
Equity method investment, ownership percentage		50.00%

Basis of Presentation and Sum48

Basis of Presentation and Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Land Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	5 years
Land Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	20 years
Buildings and Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	5 years
Buildings and Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	50 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful lives	15 years

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Millions	Sep. 18, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 27, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired		$ 25	$ 0.9	$ 96	$ 59.5	$ 25	$ 1,913.9
Goodwill		4,217.4	4,259		4,351.1	4,217.4	4,259
Goodwill, Acquired During Period				43.2	32.6	20.8
Finite-lived Intangible Assets Acquired				53.3	$ 19.1
Finite-Lived Intangible Asset, Useful Life					11 years
ERICO Global Company [Member]
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,800
Goodwill		1,031	1,061.9			1,031	1,061.9
Indefinite-lived Intangible Assets Acquired	228.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 1,033.8	1,033.8			$ 1,033.8	$ 1,033.8
Finite-lived Intangible Assets Acquired	$ 805.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	21 years
Canada, Dollars
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired			$ 1.2	$ 120.5

Acquisitions - Pro Forma Consol

Acquisitions - Pro Forma Consolidated FInancial Results of Operations (Detail) - ERICO Global Company [Member] $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)$ / shares
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs	$ 24.6
Pro forma net sales	5,002.6
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax	$ 460.4
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic | $ / shares	$ 2.55
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | $ / shares	$ 2.52

Acquisitions - Estimated Fair V

Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 4,217.4	$ 4,259	$ 4,351.1
ERICO Global Company [Member]
Business Acquisition [Line Items]
Cash	11.8	11.8
Accounts receivable	75.9	75.9
Inventories	101.8	102.4
Other current assets	2.8	2.9
Property, plant and equipment	53.1	53.4
Identifiable intangible assets	1,033.8	1,033.8
Goodwill	1,031	1,061.9
Current liabilities	94.7	97.2
Deferred income taxes, including current	382.3	418.8
Other liabilities	15.1	8
Purchase price	$ 1,818.1	$ 1,818.1

Discontinued Operations Compone

Discontinued Operations Components of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									$ 450.3	$ 1,639.4	$ 1,858.6
Cost of goods sold									339.7	1,177.1	1,271.2
Gross profit									110.6	462.3	587.4
Selling, general and administrative									103.3	367.6	457.8
Disposal Group, Including Discontinued Operation, Operating Expense									5.7	18.2	21.2
Disposal Group, Including Discontinued Operation, Other Expense									0	0	554.7
Operating Income (loss)									1.6	76.5	(446.3)
Income (loss) from discontinued operations before income taxes									2.4	77.2	(445.5)
Provision for income taxes									(3)	7.2	21.3
Income (loss) from discontinued operations, net of tax									5.4	70	(466.8)
Gain (loss) from sale / impairment of discontinued operations before income taxes									(183.5)	(0.6)	6.7
Provision for income taxes									2.4	0	0
(Gain) loss from sale / impairment of discontinued operations, net of tax	$ 17.8	$ 1.7	$ (200.6)	$ 0	$ 0	$ (0.6)	$ 0	$ 0	(181.1)	(0.6)	$ 6.7
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	0				365.4				0	365.4
Disposal Group, Including Discontinued Operation, Inventory	0				491.5				0	491.5
Other current assets	0				35				0	35
Current assets held for sale	0				891.9				0	891.9
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	0				361.5				0	361.5
Disposal Group, Including Discontinued Operation, Goodwill	0				996.4				0	996.4
Disposal Group, Including Discontinued Operation, Intangible Assets	0				703.5				0	703.5
Disposal Group, Including Discontinued Operations, Asbestos Related Insurance Receivable	0				108.5				0	108.5
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0				123				0	123
Non-current assets held for sale	0				2,292.9				0	2,292.9
Disposal Group, Including Discontinued Operation, Accounts Payable, Current	0				151.4				0	151.4
Disposal Group, Including Discontinued Operation, Employee Compensation and Benefits	0				61.5				0	61.5
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	0				143.3				0	143.3
Disposal Group, Including Discontinued Operation, Liabilities, Current	0				356.2				0	356.2
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	0				32.2				0	32.2
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent	0				162.8				0	162.8
Disposal Group, including Discontinued Operation, Asbestos Related Liabilities	0				228.3				0	228.3
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	0				82.6				0	82.6
Non-current liabilities held for sale	$ 0				$ 505.9				$ 0	$ 505.9

Discontinued Operations Additio

Discontinued Operations Additional Information (Details) - USD ($) $ in Millions	Aug. 18, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses										$ 2,759.4	$ (5.2)	$ 2,759.4	$ (5.2)	$ (3)	$ (3)
(Gain) loss from sale / impairment of discontinued operations, net of tax		$ 17.8	$ 1.7	$ (200.6)	$ 0	$ 0	$ (0.6)	$ 0	$ 0			(181.1)	(0.6)	6.7
Gain (loss) from sale / impairment of discontinued operations, net of tax		$ (3.5)	$ 0	$ 5.2	$ (7.1)	$ (21.4)	$ (22.9)	$ (10.1)	$ (15.6)			(5.4)	(70)	466.8
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal												2.4	$ 0	0
Discontinued Operations, Disposed of by Sale [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses	$ 3,150													$ 59
Discontinued Operations [Member]
Business Acquisition [Line Items]
Business Exit Costs												$ 56.4

Earnings (Loss) Per Share - Add

Earnings (Loss) Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended														12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computation Of Earnings Per Share Line Items
Net income (loss)	$ 189.6	$ 125.4		$ 263.7		$ 87.8		$ 131	$ 141		$ 142.8		$ 107.4		$ 666.5	$ 522.2	$ (76.4)
Net income from continuing operations															$ 480	$ 451.6	$ 397.1
Weighted average common shares outstanding
Basic (shares)															181.7	181.3	180.3
Dilutive impact of stock options and restricted stock awards (shares)															2	1.8	2.3
Diluted (shares)															183.7	183.1	182.6
Earnings (loss) per ordinary share
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.12	$ 0.70		$ 0.38		$ 0.44		$ 0.60	$ 0.65		$ 0.73		$ 0.50		$ 2.64	$ 2.49	$ 2.20
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.07)	(0.01)		1.07		0.04		0.12	0.13		0.06		0.09		1.03	0.39	(2.62)
Basic earnings (loss) per common share (USD per share)	1.05	0.69	[1]	1.45	[1]	0.48	[1]	0.72	0.78	[1]	0.79	[1]	0.59	[1]	3.67	2.88	(0.42)
Income (Loss) from Continuing Operations, Per Diluted Share	1.11	0.69		0.37		0.44		0.60	0.64		0.73		0.50		2.61	2.47	2.17
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.07)	(0.01)		1.06		0.04		0.11	0.13		0.05		0.09		1.02	0.38	(2.59)
Diluted earnings (loss) per common share (USD per share)	$ 1.04	$ 0.68	[1]	$ 1.43	[1]	$ 0.48	[1]	$ 0.71	$ 0.77	[1]	$ 0.78	[1]	$ 0.59	[1]	$ 3.63	$ 2.85	$ (0.42)
Anti-dilutive stock options excluded from the calculation of diluted earnings per share															1.8	1.2	1.3
[1]	Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period.

Restructuring - Additional Info

Restructuring - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)Person	Dec. 31, 2016USD ($)Person	Dec. 31, 2015USD ($)Person
Restructuring Cost and Reserve [Line Items]
Number of employees	500	650	500
Restructuring costs | $	$ 58.7	$ 24.5	$ 41.3
Water
Restructuring Cost and Reserve [Line Items]
Number of employees	250	300
Restructuring costs | $	$ 23.6	$ 10.5	17.4
Electrical
Restructuring Cost and Reserve [Line Items]
Number of employees	250	350
Restructuring costs | $	$ 16.8	$ 12.3	15.7
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs | $	$ 18.3	$ 1.7	$ 8.2
Water Quality Systems [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees			300
Flow & Filtration Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees			200

Restructuring - Costs Included

Restructuring - Costs Included in Selling, General & Administrative expenses on Consolidated Statements of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 58.7	$ 24.5	$ 41.3
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	57.1	24.5	34.5
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1.6	$ 0	$ 6.8

Restructuring - Accrual Activit

Restructuring - Accrual Activity recorded on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 25.4	$ 37.1
Costs incurred	57.1	24.5
Cash payments and other	(42.7)	(36.2)
Ending balance	$ 39.8	$ 25.4

Restructuring - Restructuring C

Restructuring - Restructuring Costs by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 58.7	$ 24.5	$ 41.3
Water
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	23.6	10.5	17.4
Electrical
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	16.8	12.3	15.7
Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 18.3	$ 1.7	$ 8.2

Goodwill and Other Identifiab59

Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortization and Impairment
Accumulated goodwill impairment losses		$ 200,500,000		$ 200,500,000
Amortization		$ 97,700,000	$ 96,400,000	$ 68,100,000
Impairment charges, related to trade names	$ 13,300,000				$ 0

Goodwill and Other Identifiab60

Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 27, 2015	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning Balance		$ 4,217.4	$ 4,259
Acquisitions/ divestitures	$ 43.2	32.6	20.8
Goodwill, Purchase Accounting Adjustments			(30.9)
Foreign currency translation/other		101.1	(31.5)
Ending Balance		4,351.1	4,217.4
Water
Goodwill [Roll Forward]
Beginning Balance		1,994.6	2,003.8
Acquisitions/ divestitures		27.3	20.8
Goodwill, Purchase Accounting Adjustments			0
Foreign currency translation/other		91	(30)
Ending Balance		2,112.9	1,994.6
Electrical
Goodwill [Roll Forward]
Beginning Balance		2,222.8	2,255.2
Acquisitions/ divestitures		5.3	0
Goodwill, Purchase Accounting Adjustments			(30.9)
Foreign currency translation/other		10.1	(1.5)
Ending Balance		$ 2,238.2	$ 2,222.8

Goodwill and Other Identifiab61

Goodwill and Other Identifiable Intangible Assets - Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	$ 1,647.3	$ 1,621.1
Accumulated amortization	(533.1)	(448.4)
Finite-life intangibles, net	1,114.2	1,172.7
Indefinite-life intangibles	444.2	459.1
Total intangibles, cost	2,091.5	2,080.2
Total intangibles, net	1,558.4	1,631.8
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	1,513.9	1,478
Accumulated amortization	(437.5)	(346.7)
Finite-life intangibles, net	1,076.4	1,131.3
Trade names
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	1.5	1.8
Accumulated amortization	(1.4)	(1.4)
Finite-life intangibles, net	0.1	0.4
Patented Technology [Member]
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	131.9	141.3
Accumulated amortization	(94.2)	(100.3)
Finite-life intangibles, net	$ 37.7	$ 41

Goodwill and Other Identifiab62

Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail) $ in Millions	Dec. 31, 2017USD ($)
Expected Amortization Expense
Estimated amortization expense 2017	$ 96.3
Estimated amortization expense 2018	89.2
Estimated amortization expense 2019	84
Estimated amortization expense 2020	77.5
Estimated amortization expense 2021	$ 70

Supplemental Balance Sheet In63

Supplemental Balance Sheet Information (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventories
Raw materials and supplies	$ 255.1	$ 223.5
Work-in-process	83	67.3
Finished goods	242.9	233.4
Total inventories	581	524.2
Other current assets
Cost in excess of billings	121.4	107.7
Prepaid expenses	80.7	68.7
Deferred income taxes	15.3	67.2
Other Current Assets	5.5	9.8
Total other current assets	222.9	253.4
Property, plant and equipment, net
Land and land improvements	72.6	66.2
Buildings and leasehold improvements	354.5	335
Machinery and equipment	1,011.6	932.5
Construction in progress	35.1	68.6
Total property, plant and equipment	1,473.8	1,402.3
Accumulated depreciation and amortization	928.3	863.7
Total property, plant and equipment, net	545.5	538.6	$ 539.8
prepaid taxes long term	254.3	0
Other non-current assets
Deferred income taxes	43	39
Deferred Compensation Plan Assets	49.4	47.9
Other non-current assets	83.2	95.2
Total other non-current assets	429.9	182.1
Other current liabilities
Dividends payable	63.1	61.8
Accrued warranty	41	38.9
Accrued Exchange Fee Rebate	92.7	78.2
Billings in excess of cost	29.9	22.5
Taxes Payable	31.1	87.3
Restructuring Reserve	39.8	25.4	$ 37.1
Other current liabilities	219.5	197.4
Total other current liabilities	517.1	511.5
Other non-current liabilities
Taxes payable	92.7	36.1
Self Insurance Reserve, Noncurrent	48.3	49.8
Deferred Compensation Liability, Current	49.4	47.9
Foreign Currency Contracts, Liability, Fair Value Disclosure	47.2	5.4
Other non-current liabilities	37.8	22.8
Total other non-current liabilities	$ 275.4	$ 162

Supplemental Cash Flow Inform64

Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Cash Flow, Supplemental [Line Items]
Cash paid for interest, net	$ 107.2	$ 143.4	$ 76.9
Cash paid for income taxes, net	$ 362.1	$ 145.1	$ 182.8

Accumulated Other Comprehensi65

Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative translation adjustments	$ (221.4)	$ (718.9)
Market value of derivative financial instruments, net of tax	(22)	(17.4)
Accumulated other comprehensive income (loss)	$ (243.4)	$ (736.3)

Debt - Additional Information (

Debt - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Aug. 31, 2015USD ($)	Oct. 31, 2014USD ($)
Debt Disclosure [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 1,440,700,000		$ 4,279,200,000
Aggregate Debt Redemption		$ 1,659,300,000
unamortized deferred financing costs		$ 6,500,000
Other Credit Facilities
Debt Disclosure [Line Items]
Credit facility maximum borrowing capacity	30,000,000
Line of credit facility, amount outstanding	$ 0
Minimum
Debt Disclosure [Line Items]
Debt agreement financial covenant, leverage ratio	3.50
Maximum
Debt Disclosure [Line Items]
Cost and expenses incurred in connection with acquisition	$ 25,000,000
Debt agreement financial covenant, leverage ratio	3
Commercial Paper
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	2.34%
Commercial Paper	$ 34,000,000		398,700,000
Senior Notes One Point Eight Seven Five Percent Due Twenty Seventeen [Member] | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	1.875%
Debt, Long-term and Short-term, Combined Amount	$ 0		350,000,000
Senior Notes Two Point Nine Percent Due Twenty Eighteen [Member] | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	2.90%
Debt, Long-term and Short-term, Combined Amount	$ 255,300,000		500,000,000
Senior Notes 2.650% due 2019 | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	2.65%
Debt, Long-term and Short-term, Combined Amount	$ 250,000,000		250,000,000
Senior Notes Two Point Four Five Percent Due Twenty Nineteen [Member] | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	2.45%
Debt, Long-term and Short-term, Combined Amount	$ 594,400,000		520,700,000
Senior Notes Three Point Six Two Five Percent Due Twenty Twenty [Member] | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	3.625%
Debt, Long-term and Short-term, Combined Amount	$ 74,000,000		400,000,000
Senior Notes, 5.000% Due 2021 | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	5.00%
Debt, Long-term and Short-term, Combined Amount	$ 103,800,000		500,000,000
Senior Notes 3.150% due 2022 | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	3.15%
Debt, Long-term and Short-term, Combined Amount	$ 88,300,000		550,000,000
Senior Notes Four Point Six Five Percent Due Twenty Twenty Five [Member] | Senior Notes
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	4.65%
Debt, Long-term and Short-term, Combined Amount	$ 19,300,000		250,000,000
Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Remaining availability under Credit Facility	2,437,600,000
Credit facility maximum borrowing capacity				$ 2,500,000,000	$ 2,100,000,000
Revolving Credit Facility [Member] | Maximum
Debt Disclosure [Line Items]
Remaining availability under Credit Facility	$ 1,897,500,000
Revolving Credit Facility [Member] | Long Term Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Debt, Weighted Average Interest Rate	3.064%
Debt, Long-term and Short-term, Combined Amount	$ 28,400,000		$ 576,800,000

Debt - Debt Outstanding and Ave

Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Line Items]
Unamortized Debt Issuance Expense	$ 6.8	$ 17.8
Long-term Debt, Excluding Current Maturities	1,440.7	4,278.4
Less: Current maturities and short-term borrowings	0	(0.8)
Total debt	1,440.7	4,279.2
Senior Notes One Point Eight Seven Five Percent Due Twenty Seventeen [Member] | Senior Notes
Debt Disclosure [Line Items]
Total debt	0	350
Senior Notes Two Point Nine Percent Due Twenty Eighteen [Member] | Senior Notes
Debt Disclosure [Line Items]
Total debt	255.3	500
Senior Notes 2.650% due 2019 | Senior Notes
Debt Disclosure [Line Items]
Total debt	250	250
Senior Notes Two Point Four Five Percent Due Twenty Nineteen [Member] | Senior Notes
Debt Disclosure [Line Items]
Total debt	594.4	520.7
Senior Notes Three Point Six Two Five Percent Due Twenty Twenty [Member] | Senior Notes
Debt Disclosure [Line Items]
Total debt	74	400
Senior Notes, 5.000% Due 2021 | Senior Notes
Debt Disclosure [Line Items]
Total debt	103.8	500
Senior Notes 3.150% due 2022 | Senior Notes
Debt Disclosure [Line Items]
Total debt	88.3	550
Senior Notes Four Point Six Five Percent Due Twenty Twenty Five [Member] | Senior Notes
Debt Disclosure [Line Items]
Total debt	19.3	250
Other Debt Obligations [Member] | Other Debt Obligations [Member]
Debt Disclosure [Line Items]
Total debt	0	0.8
Revolving Credit Facility [Member] | Long Term Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Total debt	$ 28.4	$ 576.8

Debt - Debt Outstanding Amounts

Debt - Debt Outstanding Amounts Maturing (Detail) $ in Millions	Dec. 31, 2017USD ($)
Debt Disclosure [Line Items]
Debt outstanding maturities 2017	$ 0
Debt outstanding maturities 2018	1,162.1
Debt outstanding maturities 2019	74
Debt outstanding maturities 2020	103.8
Debt outstanding maturities 2021	88.3
Debt outstanding maturities Thereafter	19.3
Long-term Debt	$ 1,447.5

Derivatives and Financial Ins69

Derivatives and Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	$ (29.6)	$ 44.2
Cross Currency Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Liability, Notional Amount	$ 481.4
Derivative, Notional Amount		$ 475.6

Derivatives and Financial Ins70

Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Long-term Debt	$ 1,447.5
Carrying (Reported) Amount, Fair Value Disclosure
Derivative [Line Items]
Variable rate debt	62.4	$ 976.3
Fixed rate debt	1,385.1	3,320.7
Long-term Debt	1,447.5	4,297
Estimate of Fair Value, Fair Value Disclosure
Derivative [Line Items]
Variable rate debt	62.4	976.3
Fixed rate debt	1,424	3,427.1
Long-term Debt	$ 1,486.4	$ 4,403.4

Derivatives and Financial Ins71

Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract liabilities	$ (5,400,000)			$ (47,200,000)
Impairment of Intangible Assets (Excluding Goodwill)	13,300,000		$ 0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	5,500,000			600,000
Foreign currency contract liabilities	(5,400,000)			(47,200,000)
Deferred compensation plan assets	47,900,000			49,400,000
Total recurring fair value measurements	48,000,000			2,800,000
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0			0
Foreign currency contract liabilities	0			0
Deferred compensation plan assets	41,600,000			42,800,000
Total recurring fair value measurements	41,600,000			42,800,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	5,500,000			600,000
Foreign currency contract liabilities	(5,400,000)			(47,200,000)
Deferred compensation plan assets	6,300,000			6,600,000
Total recurring fair value measurements	6,400,000			(40,000,000)
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0			0
Foreign currency contract liabilities	0			0
Deferred compensation plan assets	0			0
Total recurring fair value measurements	$ 0			$ 0
Valves And Controls [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)		$ 39,500,000
Goodwill, Impairment Loss		$ 515,200,000

Income Taxes - Income (Loss) Be

Income Taxes - Income (Loss) Before Income Taxes and Noncontrolling Interest (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal		$ (32.8)	$ (25.6)	$ (21.8)
International		522	586.6	534.3
Income from continuing operations before income taxes		$ 489.2	$ 561	$ 512.5
Federal statutory income tax rate	[1]	19.30%	20.00%	20.30%
[1]	The statutory rate for 2017, 2016 and 2015 reflects the U.K. statutory rate of 19.3%, 20.0% and 20.3%, respectively.

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Currently payable
Federal	$ 0.5	$ (0.1)	$ 0
International	183.8	125.6	117.7
Total current taxes	184.3	125.5	117.7
Deferred
Federal	0	(0.4)	1.2
International	(175.1)	(15.7)	(3.5)
Total deferred taxes	(175.1)	(16.1)	(2.3)
Total provision (benefit) for income taxes	$ 9.2	$ 109.4	$ 115.4

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Detail)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal statutory income tax rate	[1]	19.30%	20.00%	20.30%
Tax effect of international operations		(11.30%)	(11.80%)	(6.50%)
Change in valuation allowances		8.00%	9.70%	6.90%
Withholding taxes		0.40%	0.90%	0.60%
Interest limitations		0.60%	0.60%	0.70%
Non-deductible transaction costs		0.70%	0.10%	0.50%
Effective tax rate		1.90%	19.50%	22.50%
Effective Income Tax Rate Reconciliation, Deduction, Amount		(1.70%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation Tax Effect of US Tax Reform		(17.30%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation Tax Effect of Early Extinguishment of Debt		3.20%	0.00%	0.00%
[1]	The statutory rate for 2017, 2016 and 2015 reflects the U.K. statutory rate of 19.3%, 20.0% and 20.3%, respectively.

Income Taxes - Reconciliation75

Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate Additional Information (Detail)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal statutory income tax rate	[1]	19.30%	20.00%	20.30%
[1]	The statutory rate for 2017, 2016 and 2015 reflects the U.K. statutory rate of 19.3%, 20.0% and 20.3%, respectively.

Income Taxes - Reconciliations

Income Taxes - Reconciliations of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 71.1	$ 45.6	$ 40.3
Gross increases for tax positions in prior periods	5.3	27.4	4.7
Gross decreases for tax positions in prior periods	(5)	4.8	1.5
Gross increases based on tax positions related to the current year	1.8	2	1.3
Gross decreases related to settlements with taxing authorities	(35.7)	3.4	1.9
Reductions due to statute expiration	(2.2)	0.8	1.4
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	(1.3)	(0.2)	(2.5)
Gross increases due to acquisitions	0	5.3	6.6
Ending balance	$ 36.6	$ 71.1	$ 45.6

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	[1]	19.30%	20.00%	20.30%
Gross unrecognized tax benefits		$ 36.6	$ 71.1	$ 45.6	$ 40.3
Amount of tax benefits that, if recognized, would impact the effective tax rate		34.9
Gross increases for tax positions in prior periods		5.3	27.4	$ 4.7
Payment of penalties		2.3	2.4
Payment of interest expense		9.4	11
Tax loss carryforwards		4,052.9
Deferred tax assets, valuation allowance		792.4	$ 380.8
Non-U.S. tax losses available for carry forward		3,961
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		2,253
State tax losses available for carry forward		91.9
Minimum
Income Taxes [Line Items]
Possible amount of decrease during the next twelve months primarily as a result of the resolution of federal, state and foreign examinations and the expiration of various statutes of limitations		0
Maximum
Income Taxes [Line Items]
Possible amount of decrease during the next twelve months primarily as a result of the resolution of federal, state and foreign examinations and the expiration of various statutes of limitations		$ 16.9
Operating loss carryforwards expiration year		2,037
Foreign Country
Income Taxes [Line Items]
Deferred tax assets, valuation allowance		$ 762.2
[1]	The statutory rate for 2017, 2016 and 2015 reflects the U.K. statutory rate of 19.3%, 20.0% and 20.3%, respectively.

Income Taxes - Deferred Taxes (

Income Taxes - Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Other non-current assets	$ 43	$ 39
Deferred tax liabilities	394.8	609.5
Total deferred tax liabilities	$ 351.8	$ 570.5

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Accrued liabilities and reserves	$ 55.2	$ 83.2
Pension and other post-retirement compensation and benefits	53.8	48.9
Employee compensation and benefits	43.5	76.6
Tax loss and credit carryforwards	811.7	391
Total deferred tax assets	964.2	599.7
Valuation allowance	792.4	380.8
Deferred tax assets, net of valuation allowance	171.8	218.9
Deferred tax liabilities
Property, plant and equipment	16.5	23.6
Goodwill and other intangibles	484.7	733.7
Other liabilities	22.4	32.1
Deferred Tax Liabilities, Gross	523.6	789.4
Total deferred tax liabilities	$ 351.8	$ 570.5

Benefit Plans - Reconciliations

Benefit Plans - Reconciliations of Benefit Obligations, Fair Value of Plan Assets and Funded Status of Pension Plans and Other Post-Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets
Fair value of plan assets beginning of year	$ 390.1
Fair value of plan assets end of year	425.7	$ 390.1
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	3	3.1
Change in benefit obligations
Benefit obligation beginning of year	36.9	38.8
Service cost	0.2	0.2
Interest cost	1.3	1.5
Actuarial loss	0.2	(0.5)
Translation (gain) loss	0	0
Benefit obligation end of year	35.6	36.9	$ 38.8
Change in plan assets
Fair value of plan assets beginning of year	0	0
Actual return on plan assets	0	0
Company contributions	2.9	3.1
Translation gain (loss)	0	0
Fair value of plan assets end of year	0	0	0
Funded status
Plan assets less than benefit obligation	(35.6)	(36.9)
Defined Benefit Plan, Plan Assets, Benefits Paid	2.9	3.1
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	16.9	12.1
Change in benefit obligations
Benefit obligation beginning of year	413.3	396.9
Service cost	10.3	11.2	14
Interest cost	16.3	16.4	14.9
Actuarial loss	40	0.9
Translation (gain) loss	0	0
Benefit obligation end of year	463	413.3	396.9
Change in plan assets
Fair value of plan assets beginning of year	344.4	327.7
Actual return on plan assets	42.4	24.6
Company contributions	4.6	4.2
Translation gain (loss)	0	0
Fair value of plan assets end of year	374.5	344.4	327.7
Funded status
Plan assets less than benefit obligation	(88.5)	(68.9)
Defined Benefit Plan, Plan Assets, Benefits Paid	16.9	12.1
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	7	4.9
Change in benefit obligations
Benefit obligation beginning of year	186.8	173.4
Service cost	8	6.6	7.8
Interest cost	4.2	4.1	3.9
Actuarial loss	(8.5)	16.8
Translation (gain) loss	23.7	(9.2)
Benefit obligation end of year	207.2	186.8	173.4
Change in plan assets
Fair value of plan assets beginning of year	45.7	46.6
Actual return on plan assets	2.1	3
Company contributions	8.2	5.8
Translation gain (loss)	3.7	(4.8)
Fair value of plan assets end of year	51.2	45.7	$ 46.6
Funded status
Plan assets less than benefit obligation	(156)	(141.1)
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 8.5	$ 4.9

Benefit Plans - Amounts Recorde

Benefit Plans - Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Non-current liabilities	$ (285.6)	$ (253.4)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	0	0
Current liabilities	(3.1)	(3.2)
Non-current liabilities	(32.5)	(33.7)
Benefit obligations in excess of the fair value of plan assets	(35.6)	(36.9)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	3.8	3.2
Current liabilities	(3.6)	(2.9)
Non-current liabilities	(156.2)	(141.4)
Benefit obligations in excess of the fair value of plan assets	(156)	(141.1)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent	0	0.8
Current liabilities	(6)	(4.4)
Non-current liabilities	(82.5)	(65.3)
Benefit obligations in excess of the fair value of plan assets	$ (88.5)	$ (68.9)

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 28, 2015
Pension and other post-retirement plans
Pension plan contribution	$ 12.8	$ 10
Obligations and funded status
Defined accumulated benefit obligation plans	$ 656.7	$ 585.9
Expected rate of return on plan assets	4.11%	4.28%	3.65%
Pension plan assets yielded returns	12.30%	7.50%	(3.20%)
Savings plan
401(k) plan description	We have a 401(k) plan (the "401(k) plan") with an employee share ownership ("ESOP") bonus component, which covers certain union and all non-union U.S. employees who met certain age requirements. Under the 401(k) plan, eligible U.S. employees could voluntarily contribute a percentage of their eligible compensation. We matched contributions made by employees who met certain eligibility and service requirements. During 2017, 2016 and 2015, our matching contribution was 100% of eligible employee contributions for the first 1% of eligible compensation and 50% of the next 5% of eligible compensation. In addition to the matching contribution, all employees who met certain service requirements received a discretionary ESOP contribution equal to 1.5% of annual eligible compensation. As of January 1, 2018, the 401(k) company match contribution was changed to a dollar-for-dollar ( 100% ) matching contribution on up to 5% of employee eligible earnings, contributed as before-tax contributions. This change will replace the ESOP component discussed above and offers the same 5% total company match.
Annual eligible compensation percentage	1.50%
Other retirement compensation
Other accrued retirement compensation	$ 62.9	$ 61
Maximum
Pension plans assets
Expected contribution	21
Minimum
Pension plans assets
Expected contribution	$ 18
First 1%
Savings plan
Matching contribution to eligible employee contributions	100.00%
Percent of eligible compensation	1.00%
Next 5%
Savings plan
Matching contribution to eligible employee contributions	50.00%
Percent of eligible compensation	5.00%
Flow 401(K) Plan
Savings plan
401(k) plan and ESOP combined expenses	$ 27.9	$ 27.1	$ 26.5
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.39%	4.02%	4.21%
Obligations and funded status
Discount rate	4.02%	4.21%	3.63%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.18%	2.00%	2.52%
Obligations and funded status
Discount rate	2.00%	2.52%	2.30%
Foreign Plan [Member] | Maximum
Obligations and funded status
Discount rate	0.50%	0.50%	0.50%
Expected rate of return on plan assets	5.50%	5.50%	6.00%
Foreign Plan [Member] | Minimum
Obligations and funded status
Discount rate	3.50%	4.00%	4.25%
Expected rate of return on plan assets				1.00%	1.00%	1.00%

Benefit Plans - Pension Plans w

Benefit Plans - Pension Plans with Accumulated Benefit Obligation or Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
U.S.
Pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	$ 463	$ 87.2
Fair value of plan assets	374.5	17.5
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	463	87.2
Fair value of plan assets	374.5	17.5
Accumulated benefit obligation	460.3	86.3
Foreign Plan [Member]
Pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	182.4	165.2
Fair value of plan assets	22.6	20.9
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	170.3	165.2
Fair value of plan assets	11.4	20.9
Accumulated benefit obligation	$ 160.5	$ 155.7

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 6.6	$ 7.8
Interest cost	4.2	4.1	3.9
Expected return on plan assets	(1.5)	(1.5)	(1.6)
Net actuarial (gain) loss	(7.4)	17.2	(2.4)
Net periodic benefit expense	3.3	26.4	7.7
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	10.3	11.2	14
Interest cost	16.3	16.4	14.9
Expected return on plan assets	(11.5)	(11.4)	(10)
Net actuarial (gain) loss	9.1	(12.4)	(18)
Net periodic benefit expense	$ 24.2	$ 3.8	$ 0.9

Benefit Plans - Weighted-Averag

Benefit Plans - Weighted-Average Assumptions Used to Determine Domestic Benefit Obligations (Detail)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Benefit Obligations | Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.40%	3.80%	3.95%
Rate of compensation increase	0.00%	0.00%	0.00%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.39%	4.02%	4.21%
Rate of compensation increase	4.00%	4.00%	4.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.18%	2.00%	2.52%
Rate of compensation increase	2.93%	2.91%	2.90%

Benefit Plans - Weighted-Aver86

Benefit Plans - Weighted-Average Assumptions Used (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Periodic Benefit Costs | Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	3.95%	3.60%
Expected long-term return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.00%	2.52%	2.30%
Expected long-term return on plan assets	3.02%	3.29%	3.57%
Rate of compensation increase	2.91%	2.90%	2.89%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.02%	4.21%	3.63%
Expected long-term return on plan assets	4.11%	4.28%	3.65%
Rate of compensation increase	4.00%	4.00%	4.00%

Benefit Plans - Assumed Health

Benefit Plans - Assumed Health Care Cost Trend Rates (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate assumed for following year	6.60%	7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.40%	4.40%
Year the cost trend rate reaches the ultimate trend rate	2,038	2,038

Benefit Plans - Effect of One-P

Benefit Plans - Effect of One-Percentage-Point Change in Assumed Healthcare Cost Trend Rates (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect on total annual service and interest cost	$ 0.1
Effect on other post-retirement benefit obligations	0.7
Effect on total annual service and interest cost	(0.1)
Effect on other post-retirement benefit obligations	$ (0.6)

Benefit Plans - Actual Overall

Benefit Plans - Actual Overall Asset Allocation for U.S. And Non-U.S. Plans as Compared to Investment Policy Goals (Detail)	Dec. 31, 2017	Dec. 31, 2016
Foreign Plan [Member] | Equity securities
Plan Assets
Asset allocation	22.00%	23.00%
Target Allocation
Asset allocation	24.00%	23.00%
Foreign Plan [Member] | Fixed income
Plan Assets
Asset allocation	53.00%	46.00%
Target Allocation
Asset allocation	51.00%	48.00%
Foreign Plan [Member] | Other securities
Plan Assets
Asset allocation	22.00%	26.00%
Target Allocation
Asset allocation	23.00%	27.00%
Foreign Plan [Member] | Cash
Plan Assets
Asset allocation	3.00%	5.00%
Target Allocation
Asset allocation	2.00%	2.00%
U.S. | Fixed income
Plan Assets
Asset allocation	99.00%	99.00%
Target Allocation
Asset allocation	100.00%	100.00%
U.S. | Other securities
Plan Assets
Asset allocation	1.00%	1.00%
Target Allocation
Asset allocation	0.00%	0.00%

Benefit Plans - Plan Assets Usi

Benefit Plans - Plan Assets Using Fair Value Methodologies (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 425.7	$ 390.1
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.8	3.4
Fixed income | Foreign Government
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	289.5	290.5
Fixed income | US Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43.2	30.5
Fixed income | Collateralized Mortgage Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.3	4.5
Fixed income | Other securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63.1	37
Equity securities | U S Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.2	2.2
Equity securities | International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.2	8.3
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	13.7
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Fixed income | Foreign Government
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Fixed income | US Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Fixed income | Collateralized Mortgage Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Fixed income | Other securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Equity securities | U S Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Equity securities | International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	424.6	388.1
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.8	3.4
Fair Value, Inputs, Level 2 | Fixed income | Foreign Government
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	289.5	290.5
Fair Value, Inputs, Level 2 | Fixed income | US Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43.2	30.5
Fair Value, Inputs, Level 2 | Fixed income | Collateralized Mortgage Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.3	4.5
Fair Value, Inputs, Level 2 | Fixed income | Other securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63.1	37
Fair Value, Inputs, Level 2 | Equity securities | U S Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.2	2.2
Fair Value, Inputs, Level 2 | Equity securities | International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.2	8.3
Fair Value, Inputs, Level 2 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.3	11.7
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.1	2
Fair Value, Inputs, Level 3 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Fixed income | Foreign Government
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Fixed income | US Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Fixed income | Collateralized Mortgage Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Fixed income | Other securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Equity securities | U S Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Equity securities | International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1.1	$ 2

Benefit Plans - Expected Future

Benefit Plans - Expected Future Services to Be Paid by Plans (Detail) $ in Millions	Dec. 31, 2017USD ($)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 5.2
2,019	5.8
2,020	5.5
2,021	6.1
2,022	6.3
Thereafter	41.1
U.S.
Defined Benefit Plan Disclosure [Line Items]
2,018	203.7
2,019	178.3
2,020	6.7
2,021	6.7
2,022	6.8
Thereafter	33.6
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
2,018	3.1
2,019	3
2,020	2.9
2,021	2.8
2,022	2.7
Thereafter	$ 11.7

Shareholder's Equity - Addition

Shareholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Dec. 06, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 19, 2017	Dec. 31, 2014
Shareholders Equity
Common stock, shares authorized		426,000,000	426,000,000
Common stock, par value (per share)		$ 0.01	$ 0.01
Common stock shares repurchased, shares		3,000,000		3,100,000
Stock Repurchased During Period, Value		$ 200		$ 200
Dividends payable amount per share					$ 0.350
ApprovedNotDeclaredlDividends	$ 1.40
Dividends payable		$ 63.1	$ 61.8
Dividends paid per common share		$ 1.380	$ 1.34	$ 1.28
December 2014 Share Repurchase Program [Member] [Domain]
Shareholders Equity
Authorized amount to repurchase shares of common stock						$ 1,000
Treasury Stock [Member]
Shareholders Equity
Stock Repurchased During Period, Value		$ 0
Treasury Stock, Shares, Retired				(19,100,000)
Treasury Stock, Retired, Cost Method, Amount				$ (1,210.9)

Share Plans - Additional Inform

Share Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 39,600,000	$ 34,200,000	$ 33,000,000
Fair value of options granted
Weighted average grant date fair value of options granted	$ 12.59	$ 9.74	$ 16.40
Total intrinsic value of options exercised	$ 34,300,000	$ 27,100,000	$ 20,800,000
Unrecognized compensation cost related to stock options	9,800,000
Cash received from option exercises	46,000,000	31,600,000	28,700,000
Tax benefit realized for tax deductions from option exercises	$ 7,800,000	5,500,000	4,800,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Expiration period	10 years
Restricted shares and restricted stock units
Weighted average period to recognize compensation cost	2 years
Restricted Stock [Member]
Restricted shares and restricted stock units
Unrecognized compensation cost related to restricted stock units	$ 39,600,000
Total fair value of shares vested	21,700,000	27,200,000	26,000,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	17,500,000	17,300,000	21,600,000
Restricted shares and restricted stock units
Tax benefit realized for tax deductions from option exercises	$ 0		2,400,000
Weighted average period to recognize compensation cost	2 years 9 months 18 days
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 10,500,000	10,400,000	11,400,000
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 11,600,000	$ 6,500,000	$ 0
Restricted shares and restricted stock units
Unrecognized compensation cost related to restricted stock units	10,500,000
Tax benefit realized for tax deductions from option exercises	$ 0
Weighted average period to recognize compensation cost	1 year 7 months 9 days
Maximum | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2012 Stock and Incentive Plan
Share Incentive Plans
Number of shares authorized for issuance				9,000,000

Share Plans - Stock Option Acti

Share Plans - Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Shares
Beginning balance	5.7
Granted	0.9
Exercised	(1.2)	(0.1)
Forfeited	(0.2)
Expired	0
Ending balance	5.2
Options exercisable	3.4
Options expected to vest at end of period	1.8
Weighted Average Exercise Price
Beginning balance (USD per share)	$ 45.72
Granted (USD per share)	59.09
Exercised (USD per share)	37
Forfeited (USD per share)	60.03
Expired (USD per share)	0
Ending Balance (USD per share)	49.49
Options exercisable at end of period (USD per share)	46
Options expected to vest at end of period (USD per share)	$ 56.13
Weighted Average Remaining Contractual Life
Ending balance	5 years 5 months 30 days
Options exercisable at end of period	4 years
Options expected to vest at end of period	8 years 3 months 30 days
Aggregate Intrinsic value
Balance at end of period	$ 113.7
Options exercisable at end of period	87.5
Options expected to vest at end of period	$ 25.8

Share Plans - Stock Option Fair

Share Plans - Stock Option Fair Value Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.65%	1.56%	1.60%
Expected dividend yield	2.35%	2.49%	1.97%
Expected share price volatility	26.90%	27.30%	30.40%
Expected term (years)	6 years 3 months 24 days	5 years 10 months 24 days	6 years

Share Plans - Restricted Stock

Share Plans - Restricted Stock Units (Detail) - Restricted Stock Units shares in Millions	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Restricted Shares Outstanding Shares
Beginning balance | shares	0.7
Granted | shares	0.4
Vested | shares	(0.4)
Forfeited | shares	(0.1)
Ending Balance | shares	0.6
Weighted Average Grant Date Fair Value
Beginning balance (USD per share) | $ / shares	$ 55.31
Granted (USD per share) | $ / shares	61.27
Vested (USD per share) | $ / shares	56.73
Forfeited (USD per share) | $ / shares	54.35
Ending balance (USD per share) | $ / shares	$ 57.96

Share Plans - Share-based compe

Share Plans - Share-based compensation expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation	$ 39.6	$ 34.2	$ 33
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation	17.5	17.3	21.6
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation	10.5	10.4	11.4
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation	$ 11.6	$ 6.5	$ 0

Share Plans Performance Stock u

Share Plans Performance Stock units (Details) - Performance Shares [Member] shares in Millions	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance | shares	0.3
Beginning balance (USD per share) | $ / shares	$ 49.54
Granted | shares	0.2
Granted (USD per share) | $ / shares	$ 58.40
Vested | shares	0
Vested (USD per share) | $ / shares	$ 0
Forfeited | shares	0
Forfeited (USD per share) | $ / shares	$ 0
Ending Balance | shares	0.5
Ending balance (USD per share) | $ / shares	$ 53.56

Segment Information - Financial

Segment Information - Financial Information By Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,260.9	$ 1,226.8	$ 1,265.3	$ 1,183.5	$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190	$ 4,936.5	$ 4,890	$ 4,616.4
Segment income (loss)											755.2
Identifiable assets (1)	8,633.7				11,534.8				8,633.7	11,534.8	11,833.5
Depreciation									85.2	84.6	81.2
Capital expenditures									70.9	117.8	91.3
Operating Income (Loss)	137.4	$ 192.2	$ 212.8	$ 138.4	161.8	$ 182.8	$ 203.4	$ 152.7	680.8	700.7	616.1
Water Quality Systems [Member]
Segment Reporting Information [Line Items]
Capital expenditures									36.1	40.8	41.5
Flow & Filtration Solutions [Member]
Segment Reporting Information [Line Items]
Capital expenditures									31.8	74.5	47.4
Water
Segment Reporting Information [Line Items]
Net sales									2,844.4	2,777.7	2,808.3
Segment income (loss)											469
Identifiable assets (1)	3,667.1				3,465.5				3,667.1	3,465.5	3,624.5
Depreciation									45.6	46.8	45.3
Operating Income (Loss)									546	494
Electrical
Segment Reporting Information [Line Items]
Net sales									2,097.9	2,116	1,809.3
Segment income (loss)											395
Identifiable assets (1)	4,634.1				4,419.3				4,634.1	4,419.3	4,488.4
Depreciation									34.3	31.6	27.6
Operating Income (Loss)									447	447.2
All Other Segments
Segment Reporting Information [Line Items]
Net sales									(5.8)	(3.7)	(1.2)
Segment income (loss)											(108.8)
Identifiable assets (1)	$ 332.5				$ 3,650				332.5	3,650	3,720.6
Depreciation									5.3	6.2	8.3
Capital expenditures									3	2.5	$ 2.4
Operating Income (Loss)									(95.8)	(101.7)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									$ 897.2	$ 839.5

Segment Information - Geographi

Segment Information - Geographic Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Geographic Information [Line Items]
Net sales	$ 1,260.9	$ 1,226.8	$ 1,265.3	$ 1,183.5	$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190	$ 4,936.5	$ 4,890	$ 4,616.4
Long-lived assets	545.5				538.6				545.5	538.6	539.8
U.S.
Geographic Information [Line Items]
Net sales									2,973.7	2,897.1	2,634
Long-lived assets	301.4				309.5				301.4	309.5	285.9
Western Europe
Geographic Information [Line Items]
Net sales									827.2	796	727.6
Long-lived assets	61.7				138.6				61.7	138.6	150.7
Developing (1)
Geographic Information [Line Items]
Net sales									723.7	704	731.6
Long-lived assets	157.1				65.2				157.1	65.2	60.3
Other Developed (2)
Geographic Information [Line Items]
Net sales									411.9	492.9	523.2
Long-lived assets	$ 25.3				$ 25.3				$ 25.3	$ 25.3	$ 42.9

Segment Information Reconciliat

Segment Information Reconciliation of Income from Continuing Operations from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 137.4	$ 192.2	$ 212.8	$ 138.4	$ 161.8	$ 182.8	$ 203.4	$ 152.7	$ 680.8	$ 700.7	$ 616.1
Segment Income (Loss)											755.2
Restructuring costs									(58.7)	(24.5)	(41.3)
Mark-to-market actuarial gains (losses) on pension and post-retirement benefit plans					$ 4.2
Impairment of trade names									32	13.3	0
Gain (Loss) on Disposition of Business									(4.2)	(3.9)	(3.2)
Gain (Loss) on Extinguishment of Debt									(101.4)	0	0
Income from continuing operations before income taxes									489.2	561	512.5
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Income (Loss)											755.2
Payments for Merger Related Costs									0	0	14.3
Inventory Step Up Related To Merger									0	0	35.7
Restructuring costs											(42.5)
Separation Costs of Proposed Spin-Off									(53.1)	0	0
Amortization											(68.1)
Mark-to-market actuarial gains (losses) on pension and post-retirement benefit plans									1.6	4.2	(23)
Impairment of trade names									(32)	(13.3)	0
Gain (Loss) on Disposition of Business											(3.2)
Gain (Loss) on Extinguishment of Debt											0
Interest Revenue (Expense), Net											$ (101.9)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring costs									(30.7)	(20.6)
Amortization									(97.7)	(96.4)
Gain (Loss) on Disposition of Business									(4.2)	(3.9)
Gain (Loss) on Extinguishment of Debt									(101.4)	0
Interest Revenue (Expense), Net									(87.3)	(140.1)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)									$ 897.2	$ 839.5

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Outstanding Value Of Letters Of Credit	$ 201.5	$ 331

Commitments and Contingencie103

Commitments and Contingencies - Net Rental Expense Under Operating Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Gross rental expense	$ 40.4	$ 37.5	$ 26.4
Sublease rental income	(0.3)	(0.7)	(0.4)
Net rental expense	$ 40.1	$ 36.8	$ 26

Commitments and Contingencie104

Commitments and Contingencies - Future Minimum Lease Commitments Under Non-Cancelable Operating Leases (Detail) $ in Millions	Dec. 31, 2017USD ($)
Operating Leased Assets [Line Items]
2,018	$ (34)
2,019	(29.1)
2,020	(21.2)
2,021	(15.6)
2,022	(13.1)
Thereafter	(15.1)
Total	(128.1)
Minimum lease payments
Operating Leased Assets [Line Items]
2,018	(34.3)
2,019	(29.1)
2,020	(21.2)
2,021	(15.6)
2,022	(13.1)
Thereafter	(15.1)
Total	(128.4)
Minimum sublease rentals
Operating Leased Assets [Line Items]
2,018	(0.3)
2,019	0
2,020	0
2,021	0
2,022	0
Thereafter	0
Total	$ (0.3)

Commitments and Contingencie105

Commitments and Contingencies - Warranty Reserve Rollforward (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 38.9	$ 47
Service and product warranty provision	64.1	59.7
Payments	(62.7)	(67.3)
Foreign currency translation	0.7	(0.5)
Ending balance	$ 41	$ 38.9

Selected Quarterly Data (una106

Selected Quarterly Data (unaudited) - Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended														12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information [Line Items]
Net sales	$ 1,260.9	$ 1,226.8		$ 1,265.3		$ 1,183.5		$ 1,188.1	$ 1,210.7		$ 1,301.2		$ 1,190		$ 4,936.5	$ 4,890	$ 4,616.4
Gross profit	468.3	455.3		483.2		422.3		440.1	440.9		481.8		431.3		1,829.1	1,794.1	1,598.8
Operating income	137.4	192.2		212.8		138.4		161.8	182.8		203.4		152.7		680.8	700.7	616.1
Net income from continuing operations	203.9	127.1		68.3		80.7		109.6	117.5		132.7		91.8		480	451.6	397.1
Income (loss) from discontinued operations, net of tax	3.5	0		(5.2)		7.1		21.4	22.9		10.1		15.6		5.4	70	(466.8)
Gain (loss) from sale / impairment of discontinued operations, net of tax	(17.8)	(1.7)		200.6		0		0	0.6		0		0		181.1	0.6	(6.7)
Net income (loss)	$ 189.6	$ 125.4		$ 263.7		$ 87.8		$ 131	$ 141		$ 142.8		$ 107.4		$ 666.5	$ 522.2	$ (76.4)
Earnings (loss) per ordinary share
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.12	$ 0.70		$ 0.38		$ 0.44		$ 0.60	$ 0.65		$ 0.73		$ 0.50		$ 2.64	$ 2.49	$ 2.20
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.07)	(0.01)		1.07		0.04		0.12	0.13		0.06		0.09		1.03	0.39	(2.62)
Earnings Per Share, Basic	1.05	0.69	[1]	1.45	[1]	0.48	[1]	0.72	0.78	[1]	0.79	[1]	0.59	[1]	3.67	2.88	(0.42)
Income (Loss) from Continuing Operations, Per Diluted Share	1.11	0.69		0.37		0.44		0.60	0.64		0.73		0.50		2.61	2.47	2.17
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.07)	(0.01)		1.06		0.04		0.11	0.13		0.05		0.09		1.02	0.38	(2.59)
Diluted	$ 1.04	$ 0.68	[1]	$ 1.43	[1]	$ 0.48	[1]	$ 0.71	$ 0.77	[1]	$ 0.78	[1]	$ 0.59	[1]	$ 3.63	$ 2.85	$ (0.42)
[1]	Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period.

Selected Quarterly Data (una107

Selected Quarterly Data (unaudited) - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effect of Fourth Quarter Events [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 13,300,000				$ 0
Mark-to-market actuarial gains (losses) on pension and post-retirement benefit plans	$ 4,200,000
Disposal Group, Including Discontinued Operation, Other Expense		$ 0	$ 0	$ 554,700,000

Financial Statements of Pare108

Financial Statements of Parent Company Guarantor - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Ownership percentage	100.00%
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Ownership percentage	100.00%

Financial Statements of Pare109

Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 1,260.9	$ 1,226.8	$ 1,265.3	$ 1,183.5	$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190	$ 4,936.5	$ 4,890	$ 4,616.4
Cost of goods sold									3,107.4	3,095.9	3,017.6
Gross profit	468.3	455.3	483.2	422.3	440.1	440.9	481.8	431.3	1,829.1	1,794.1	1,598.8
Selling, general and administrative									1,032.5	979.3	884
Research and development									115.8	114.1	98.7
Impairment of trade names									32	13.3	0
Operating income	137.4	192.2	212.8	138.4	161.8	182.8	203.4	152.7	680.8	700.7	616.1
Loss (earnings) from investment in subsidiaries									0	0	0
Loss on sale of businesses									4.2	3.9	3.2
Gains (Losses) on Extinguishment of Debt									101.4	0	0
Other (income) expense:
Equity income of unconsolidated subsidiaries									(1.3)	(4.3)	(1.5)
Interest income									(9.9)	(8.3)	(4.7)
Interest expense									97.2	148.4	106.6
Income from continuing operations before income taxes									489.2	561	512.5
Provision for income taxes									9.2	109.4	115.4
Net income from continuing operations	203.9	127.1	68.3	80.7	109.6	117.5	132.7	91.8	480	451.6	397.1
Income (loss) from discontinued operations, net of tax	3.5	0	(5.2)	7.1	21.4	22.9	10.1	15.6	5.4	70	(466.8)
Gain (loss) from sale / impairment of discontinued operations, net of tax	(17.8)	(1.7)	200.6	0	0	0.6	0	0	181.1	0.6	(6.7)
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									0	0	0
Net income (loss) from continuing operations before noncontrolling interest									666.5	522.2	(76.4)
Net income (loss)	$ 189.6	$ 125.4	$ 263.7	$ 87.8	$ 131	$ 141	$ 142.8	$ 107.4	666.5	522.2	(76.4)
Net income from continuing operations									480	451.6	397.1
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									497.5	(83)	(264.9)
Changes in market value of derivative financial instruments									(4.6)	(8.3)	0.2
Comprehensive income (loss)									1,159.4	430.9	(341.1)
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Net sales									0	0	0
Cost of goods sold									0	0	0
Gross profit									0	0	0
Selling, general and administrative									4.1	15.8	33.7
Research and development									0	0	0
Operating income									(4.1)	(15.8)	(33.7)
Loss (earnings) from investment in subsidiaries									(483.2)	(466)	(436.1)
Loss on sale of businesses									0	0
Gains (Losses) on Extinguishment of Debt									0		0
Other (income) expense:
Equity income of unconsolidated subsidiaries									0	0	0
Interest income									0	0	0
Interest expense									0	0	0
Income from continuing operations before income taxes									479.1	450.2	402.4
Provision for income taxes									(0.9)	(1.4)	5.3
Net income from continuing operations									480	451.6	397.1
Income (loss) from discontinued operations, net of tax									0	0	0
Gain (loss) from sale / impairment of discontinued operations, net of tax									0	0	0
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									186.5	70.6	(473.5)
Net income (loss) from continuing operations before noncontrolling interest									666.5	522.2	(76.4)
Net income (loss)									666.5	522.2	(76.4)
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									497.5	(83)	(264.9)
Changes in market value of derivative financial instruments									(4.6)	(8.3)	0.2
Comprehensive income (loss)									1,159.4	430.9	(341.1)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales									0	0	0
Cost of goods sold									0	0	0
Gross profit									0	0	0
Selling, general and administrative									0.6	0	2.2
Research and development									0	0	0
Operating income									(0.6)	0	(2.2)
Loss (earnings) from investment in subsidiaries									(482.6)	(466)	(439.7)
Loss on sale of businesses									0	0
Gains (Losses) on Extinguishment of Debt									0		0
Other (income) expense:
Equity income of unconsolidated subsidiaries									0	0	0
Interest income									(0.6)	0	0
Interest expense									0	0	1.4
Income from continuing operations before income taxes									482.6	466	436.1
Provision for income taxes									0	0	0
Net income from continuing operations									482.6	466	436.1
Income (loss) from discontinued operations, net of tax									0	0	0
Gain (loss) from sale / impairment of discontinued operations, net of tax									0	0	0
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									186.5	70.6	(473.5)
Net income (loss) from continuing operations before noncontrolling interest									669.1	536.6	(37.4)
Net income (loss)									669.1	536.6	(37.4)
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									497.5	(83)	(264.9)
Changes in market value of derivative financial instruments									(4.6)	(8.3)	0.2
Comprehensive income (loss)									1,162	445.3	(302.1)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales									0	0	0
Cost of goods sold									0	0	0
Gross profit									0	0	0
Selling, general and administrative									0	1.2	5.3
Research and development									0	0	0
Operating income									0	(1.2)	(5.3)
Loss (earnings) from investment in subsidiaries									(644.4)	(578.1)	(475.1)
Loss on sale of businesses									0	0
Gains (Losses) on Extinguishment of Debt									91		0
Other (income) expense:
Equity income of unconsolidated subsidiaries									0	0	0
Interest income									(69.2)	(70.3)	(80.6)
Interest expense									139.9	181.2	126.3
Income from continuing operations before income taxes									482.7	466	424.1
Provision for income taxes									0	0	0
Net income from continuing operations									482.7	466	424.1
Income (loss) from discontinued operations, net of tax									0	0	0
Gain (loss) from sale / impairment of discontinued operations, net of tax									0	0	0
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									186.5	70.6	(473.5)
Net income (loss) from continuing operations before noncontrolling interest									669.2	536.6	(49.4)
Net income (loss)									669.2	536.6	(49.4)
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									497.5	(83)	(264.9)
Changes in market value of derivative financial instruments									(4.6)	(8.3)	0.2
Comprehensive income (loss)									1,162.1	445.3	(314.1)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales									4,936.5	4,890	4,616.4
Cost of goods sold									3,107.4	3,095.9	3,017.6
Gross profit									1,829.1	1,794.1	1,598.8
Selling, general and administrative									1,027.8	962.3	842.8
Research and development									115.8	114.1	98.7
Operating income									685.5	717.7	657.3
Loss (earnings) from investment in subsidiaries									0	0	0
Loss on sale of businesses									4.2	3.9	3.2
Gains (Losses) on Extinguishment of Debt									10.4
Other (income) expense:
Equity income of unconsolidated subsidiaries									(1.3)	(4.3)	(1.5)
Interest income									(63.7)	(54.5)	(33.8)
Interest expense									80.9	83.7	88.6
Income from continuing operations before income taxes									655	688.9	600.8
Provision for income taxes									10.1	110.8	110.1
Net income from continuing operations									644.9	578.1	490.7
Income (loss) from discontinued operations, net of tax									5.4	70	(466.8)
Gain (loss) from sale / impairment of discontinued operations, net of tax									181.1	0.6	(6.7)
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									0	0	0
Net income (loss) from continuing operations before noncontrolling interest									831.4	648.7	17.2
Net income (loss)									831.4	648.7	17.2
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									497.5	(83)	(264.9)
Changes in market value of derivative financial instruments									(4.6)	(8.3)	0.2
Comprehensive income (loss)									1,324.3	557.4	(247.5)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales									0	0	0
Cost of goods sold									0	0	0
Gross profit									0	0	0
Selling, general and administrative									0	0	0
Research and development									0	0	0
Operating income									0	0	0
Loss (earnings) from investment in subsidiaries									1,610.2	1,510.1	1,350.9
Loss on sale of businesses									0	0
Gains (Losses) on Extinguishment of Debt									0		0
Other (income) expense:
Equity income of unconsolidated subsidiaries									0	0	0
Interest income									123.6	116.5	109.7
Interest expense									(123.6)	(116.5)	(109.7)
Income from continuing operations before income taxes									(1,610.2)	(1,510.1)	(1,350.9)
Provision for income taxes									0	0	0
Net income from continuing operations									(1,610.2)	(1,510.1)	(1,350.9)
Income (loss) from discontinued operations, net of tax									0	0	0
Gain (loss) from sale / impairment of discontinued operations, net of tax									0	0	0
Discontinued Operation, Income (Loss) from Investment in Subsidiaries									(559.5)	(211.8)	1,420.5
Net income (loss) from continuing operations before noncontrolling interest									(2,169.7)	(1,721.9)	69.6
Net income (loss)									(2,169.7)	(1,721.9)	69.6
Comprehensive income (loss), net of tax
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $374.2 for the year ended December 31, 2017)									(1,492.5)	249	794.7
Changes in market value of derivative financial instruments									13.8	24.9	(0.6)
Comprehensive income (loss)									$ (3,648.4)	$ (1,448)	$ 863.7

Financial Statements of Pare110

Financial Statements of Parent Company Guarantor - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 113.3	$ 238.5	$ 126.3	$ 110.4
Accounts and notes receivable, net	831.6	764
Inventories	581	524.2
Other current assets	222.9	253.4
Current assets held for sale	0	891.9
Total current assets	1,748.8	2,672
Property, plant and equipment, net	545.5	538.6	539.8
Other assets
Investments in subsidiaries	0	0
Goodwill	4,351.1	4,217.4	4,259
Intangibles, net	1,558.4	1,631.8
Other non-current assets	429.9	182.1
Non-current assets held for sale	0	2,292.9
Total other assets	6,339.4	8,324.2
Total assets	8,633.7	11,534.8	11,833.5
Current liabilities
Current maturities of long-term debt and short-term borrowings	0	0.8
Accounts payable	495.7	436.6
Employee compensation and benefits	186.6	166.1
Other current liabilities	517.1	511.5
Current liabilities held for sale	0	356.2
Total current liabilities	1,199.4	1,471.2
Other liabilities
Long-term debt	1,440.7	4,278.4
Pension and other post-retirement compensation and benefits	285.6	253.4
Deferred tax liabilities	394.8	609.5
Other non-current liabilities	275.4	162
Non-current liabilities held for sale	0	505.9
Total liabilities	3,595.9	7,280.4
Equity
Total equity	5,037.8	4,254.4	4,008.8	4,663.8
Total liabilities and equity	8,633.7	11,534.8
Parent Company Guarantor
Current assets
Cash and cash equivalents	0	0	0	0
Accounts and notes receivable, net	0	0.1
Inventories	0	0
Other current assets	10.8	1.2
Current assets held for sale		0
Total current assets	10.8	1.3
Property, plant and equipment, net	0	0
Other assets
Investments in subsidiaries	5,205.1	4,509.5
Goodwill	0	0
Intangibles, net	0	0
Other non-current assets	2.2	2.2
Non-current assets held for sale	0	0
Total other assets	5,207.3	4,511.7
Total assets	5,218.1	4,513
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	1.4	0.7
Employee compensation and benefits	0.4	0.8
Other current liabilities	99.6	95.2
Current liabilities held for sale		0
Total current liabilities	101.4	96.7
Other liabilities
Long-term debt	48.4	148.1
Pension and other post-retirement compensation and benefits	0	0
Deferred tax liabilities	0	0
Other non-current liabilities	30.5	13.8
Non-current liabilities held for sale		0
Total liabilities	180.3	258.6
Equity
Total equity	5,037.8	4,254.4
Total liabilities and equity	5,218.1	4,513
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	0	0	0	0
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	1.8	4.1
Current assets held for sale		0
Total current assets	1.8	4.1
Property, plant and equipment, net	0	0
Other assets
Investments in subsidiaries	5,109.6	4,471.4
Goodwill	0	0
Intangibles, net	0	0
Other non-current assets	0	35.2
Non-current assets held for sale	94.1	0
Total other assets	5,203.7	4,506.6
Total assets	5,205.5	4,510.7
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	0	0
Employee compensation and benefits	0	0
Other current liabilities	0.4	1.2
Current liabilities held for sale		0
Total current liabilities	0.4	1.2
Other liabilities
Long-term debt	0	0
Pension and other post-retirement compensation and benefits	0	0
Deferred tax liabilities	0	0
Other non-current liabilities	0	0
Non-current liabilities held for sale		0
Total liabilities	0.4	1.2
Equity
Total equity	5,205.1	4,509.5
Total liabilities and equity	5,205.5	4,510.7
Subsidiary Issuer
Current assets
Cash and cash equivalents	0	0	0.1	0.1
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	1.5	1.1
Current assets held for sale		0
Total current assets	1.5	1.1
Property, plant and equipment, net	0	0
Other assets
Investments in subsidiaries	7,156.1	9,295.5
Goodwill	0	0
Intangibles, net	0	0
Other non-current assets	0	717.8
Non-current assets held for sale	614	0
Total other assets	7,770.1	10,013.3
Total assets	7,771.6	10,014.4
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	0	0.1
Employee compensation and benefits	0	0
Other current liabilities	9.4	26.7
Current liabilities held for sale		0
Total current liabilities	9.4	26.8
Other liabilities
Long-term debt	2,652.8	5,515.9
Pension and other post-retirement compensation and benefits	0	0
Deferred tax liabilities	0	0
Other non-current liabilities	0	0
Non-current liabilities held for sale		0
Total liabilities	2,662.2	5,542.7
Equity
Total equity	5,109.4	4,471.7
Total liabilities and equity	7,771.6	10,014.4
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	113.3	238.5	126.2	110.3
Accounts and notes receivable, net	831.6	763.9
Inventories	581	524.2
Other current assets	239.3	237.8
Current assets held for sale		891.9
Total current assets	1,765.2	2,656.3
Property, plant and equipment, net	545.5	538.6
Other assets
Investments in subsidiaries	0	0
Goodwill	4,351.1	4,217.4
Intangibles, net	1,558.4	1,631.8
Other non-current assets	2,317.1	1,568.9
Non-current assets held for sale	(708.1)	2,292.9
Total other assets	7,518.5	9,711
Total assets	9,829.2	12,905.9
Current liabilities
Current maturities of long-term debt and short-term borrowings		0.8
Accounts payable	494.3	435.8
Employee compensation and benefits	186.2	165.3
Other current liabilities	438.2	379.2
Current liabilities held for sale		356.2
Total current liabilities	1,118.7	1,337.3
Other liabilities
Long-term debt	628.9	756.4
Pension and other post-retirement compensation and benefits	285.6	253.4
Deferred tax liabilities	394.8	609.5
Other non-current liabilities	244.9	148.2
Non-current liabilities held for sale		505.9
Total liabilities	2,672.9	3,610.7
Equity
Total equity	7,156.3	9,295.2
Total liabilities and equity	9,829.2	12,905.9
Eliminations
Current assets
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts and notes receivable, net	0	0
Inventories	0	0
Other current assets	(30.5)	9.2
Current assets held for sale		0
Total current assets	(30.5)	9.2
Property, plant and equipment, net	0	0
Other assets
Investments in subsidiaries	(17,470.8)	(18,276.4)
Goodwill	0	0
Intangibles, net	0	0
Other non-current assets	(1,889.4)	(2,142)
Non-current assets held for sale	0	0
Total other assets	(19,360.2)	(20,418.4)
Total assets	(19,390.7)	(20,409.2)
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	0	0
Employee compensation and benefits	0	0
Other current liabilities	(30.5)	9.2
Current liabilities held for sale		0
Total current liabilities	(30.5)	9.2
Other liabilities
Long-term debt	(1,889.4)	(2,142)
Pension and other post-retirement compensation and benefits	0	0
Deferred tax liabilities	0	0
Other non-current liabilities	0	0
Non-current liabilities held for sale		0
Total liabilities	(1,919.9)	(2,132.8)
Equity
Total equity	(17,470.8)	(18,276.4)
Total liabilities and equity	$ (19,390.7)	$ (20,409.2)

Financial Statements of Pare111

Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended										9 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 27, 2015	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Revenue, Net	$ 1,260.9	$ 1,226.8	$ 1,265.3	$ 1,183.5	$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190					$ 4,936.5	$ 4,890	$ 4,616.4
Operating activities
Net cash provided by (used for) operating activities													620.2	861.4	739.3
Investing activities
Capital expenditures													(70.9)	(117.8)	(91.3)
Proceeds from sale of property and equipment													7.9	24.7	4.6
Proceeds from sale of businesses, net											$ 2,759.4	$ (5.2)	2,759.4	(5.2)	(3)	$ (3)
Acquisitions, net of cash acquired					(25)				$ (0.9)	$ (96)			(59.5)	(25)	(1,913.9)
Intercompany Loan Activity, Net													0		0
Net cash provided by (used for) investing activities of continuing operations													2,636.9	(123.3)	(2,003.6)
Net cash provided by (used for) investing activities of discontinued operations													(6.5)	1.5	38.1
Net cash provided by (used for) investing activities													2,630.4	(121.8)	(1,965.5)
Financing activities
Net receipts (repayments) of short-term borrowings													(0.8)	0.8	(2.3)
Net receipts (repayments) of commercial paper and revolving long-term debt													(913.1)	(385.3)	363.5
Proceeds from long-term debt													0	0	1,714.8
Repayment of long-term debt													(2,009.3)	(0.7)	(356.6)
Debt issuance costs													0	0	(26.8)
Payment for Debt Extinguishment or Debt Prepayment Cost													(94.9)	0	0
Net change in advances to subsidiaries													0	0	0
Excess tax benefits from share-based compensation													0	8	6
Shares issued to employees, net of shares withheld													37.2	20.7	19.4
Repurchases of ordinary shares													(200)	0	(200)
Dividends paid													(251.7)	(243.6)	(231.7)
Net cash provided by (used for) financing activities													(3,432.6)	(600.1)	1,286.3
Effect of exchange rate changes on cash and cash equivalents													56.8	(27.3)	(44.2)
Change in cash and cash equivalents													(125.2)	112.2	15.9
Cash and cash equivalents, beginning of year				238.5				126.3			238.5	126.3	238.5	126.3	110.4
Cash and cash equivalents, end of year	113.3				238.5				126.3				113.3	238.5	126.3	110.4
Cost of goods sold													3,107.4	3,095.9	3,017.6
Gross profit	468.3	455.3	483.2	422.3	440.1	440.9	481.8	431.3					1,829.1	1,794.1	1,598.8
Selling, General and Administrative Expense													1,032.5	979.3	884
Research and Development Expense													115.8	114.1	98.7
Impairment of goodwill and trade names													32	13.3	0
Operating Income (Loss)	137.4	$ 192.2	$ 212.8	138.4	161.8	$ 182.8	$ 203.4	152.7					680.8	700.7	616.1
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Revenue, Net													0	0	0
Operating activities
Net cash provided by (used for) operating activities													677	522.7	(43)
Investing activities
Capital expenditures													0	0	0
Proceeds from sale of property and equipment													0	0	0
Proceeds from sale of businesses, net													0	0	0
Acquisitions, net of cash acquired													0	0	0
Intercompany Loan Activity, Net													0	0	0
Net cash provided by (used for) investing activities of continuing operations													0	0	0
Net cash provided by (used for) investing activities of discontinued operations													0	0	0
Net cash provided by (used for) investing activities													0	0	0
Financing activities
Net receipts (repayments) of short-term borrowings													0	0	0
Net receipts (repayments) of commercial paper and revolving long-term debt													0	0	0
Proceeds from long-term debt															0
Repayment of long-term debt													0	0	0
Debt issuance costs															0
Payment for Debt Extinguishment or Debt Prepayment Cost													0
Net change in advances to subsidiaries													(262.5)	(299.8)	471.7
Excess tax benefits from share-based compensation														0	0
Shares issued to employees, net of shares withheld													37.2	20.7	3
Repurchases of ordinary shares													(200)		(200)
Dividends paid													(251.7)	(243.6)	(231.7)
Net cash provided by (used for) financing activities													(677)	(522.7)	43
Effect of exchange rate changes on cash and cash equivalents													0	0	0
Change in cash and cash equivalents													0	0	0
Cash and cash equivalents, beginning of year				0				0			0	0	0	0	0
Cash and cash equivalents, end of year	0				0				0				0	0	0	0
Cost of goods sold													0	0	0
Gross profit													0	0	0
Selling, General and Administrative Expense													4.1	15.8	33.7
Research and Development Expense													0	0	0
Operating Income (Loss)													(4.1)	(15.8)	(33.7)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenue, Net													0	0	0
Operating activities
Net cash provided by (used for) operating activities													670.6	463.1	(48.7)
Investing activities
Capital expenditures													0	0	0
Proceeds from sale of property and equipment													0	0	0
Proceeds from sale of businesses, net													0	0	0
Acquisitions, net of cash acquired													0	0	0
Intercompany Loan Activity, Net													(58.9)	0	0
Net cash provided by (used for) investing activities of continuing operations													(58.9)	0	0
Net cash provided by (used for) investing activities of discontinued operations													0	0	0
Net cash provided by (used for) investing activities													(58.9)	0	0
Financing activities
Net receipts (repayments) of short-term borrowings													0	0	0
Net receipts (repayments) of commercial paper and revolving long-term debt													0	0	0
Proceeds from long-term debt															0
Repayment of long-term debt													0	0	0
Debt issuance costs															0
Payment for Debt Extinguishment or Debt Prepayment Cost													0
Net change in advances to subsidiaries													(611.7)	(463.1)	48.7
Excess tax benefits from share-based compensation														0	0
Shares issued to employees, net of shares withheld													0	0	0
Repurchases of ordinary shares													0		0
Dividends paid													0	0	0
Net cash provided by (used for) financing activities													(611.7)	(463.1)	48.7
Effect of exchange rate changes on cash and cash equivalents													0	0	0
Change in cash and cash equivalents													0	0	0
Cash and cash equivalents, beginning of year				0				0			0	0	0	0	0
Cash and cash equivalents, end of year	0				0				0				0	0	0	0
Cost of goods sold													0	0	0
Gross profit													0	0	0
Selling, General and Administrative Expense													0.6	0	2.2
Research and Development Expense													0	0	0
Operating Income (Loss)													(0.6)	0	(2.2)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Revenue, Net													0	0	0
Operating activities
Net cash provided by (used for) operating activities													661.3	469.5	(5.8)
Investing activities
Capital expenditures													0	0	0
Proceeds from sale of property and equipment													0	0	0
Proceeds from sale of businesses, net													2,765.6	0	0
Acquisitions, net of cash acquired													0	0	0
Intercompany Loan Activity, Net													103.7	667.3	891
Net cash provided by (used for) investing activities of continuing operations													2,869.3	667.3	891
Net cash provided by (used for) investing activities of discontinued operations													0	0	0
Net cash provided by (used for) investing activities													2,869.3	667.3	891
Financing activities
Net receipts (repayments) of short-term borrowings													0	0	0
Net receipts (repayments) of commercial paper and revolving long-term debt													(914.7)	(385.8)	346.9
Proceeds from long-term debt															1,714.8
Repayment of long-term debt													(1,917.8)	0	(350)
Debt issuance costs															(26.8)
Payment for Debt Extinguishment or Debt Prepayment Cost													(86)
Net change in advances to subsidiaries													(685.9)	(778.9)	(2,553.7)
Excess tax benefits from share-based compensation														0	0
Shares issued to employees, net of shares withheld													0	0	0
Repurchases of ordinary shares													0		0
Dividends paid													0	0	0
Net cash provided by (used for) financing activities													(3,604.4)	(1,164.7)	(868.8)
Effect of exchange rate changes on cash and cash equivalents													73.8	27.8	(16.4)
Change in cash and cash equivalents													0	(0.1)	0
Cash and cash equivalents, beginning of year				0				0.1			0	0.1	0	0.1	0.1
Cash and cash equivalents, end of year	0				0				0.1				0	0	0.1	0.1
Cost of goods sold													0	0	0
Gross profit													0	0	0
Selling, General and Administrative Expense													0	1.2	5.3
Research and Development Expense													0	0	0
Operating Income (Loss)													0	(1.2)	(5.3)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue, Net													4,936.5	4,890	4,616.4
Operating activities
Net cash provided by (used for) operating activities													781	916.2	767.1
Investing activities
Capital expenditures													(70.9)	(117.8)	(91.3)
Proceeds from sale of property and equipment													7.9	24.7	4.6
Proceeds from sale of businesses, net													(6.2)	(5.2)	(3)
Acquisitions, net of cash acquired													(59.5)	(25)	(1,913.9)
Intercompany Loan Activity, Net													172.6	(191)	(295)
Net cash provided by (used for) investing activities of continuing operations													43.9	(314.3)	(2,298.6)
Net cash provided by (used for) investing activities of discontinued operations													(6.5)	1.5	38.1
Net cash provided by (used for) investing activities													37.4	(312.8)	(2,260.5)
Financing activities
Net receipts (repayments) of short-term borrowings													(0.8)	0.8	(2.3)
Net receipts (repayments) of commercial paper and revolving long-term debt													1.6	0.5	16.6
Proceeds from long-term debt															0
Repayment of long-term debt													(91.5)	(0.7)	(6.6)
Debt issuance costs															0
Payment for Debt Extinguishment or Debt Prepayment Cost													(8.9)
Net change in advances to subsidiaries													(827)	(444.6)	1,507
Excess tax benefits from share-based compensation														8	6
Shares issued to employees, net of shares withheld													0	0	16.4
Repurchases of ordinary shares													0		0
Dividends paid													0	0	0
Net cash provided by (used for) financing activities													(926.6)	(436)	1,537.1
Effect of exchange rate changes on cash and cash equivalents													(17)	(55.1)	(27.8)
Change in cash and cash equivalents													(125.2)	112.3	15.9
Cash and cash equivalents, beginning of year				238.5				126.2			238.5	126.2	238.5	126.2	110.3
Cash and cash equivalents, end of year	113.3				238.5				126.2				113.3	238.5	126.2	110.3
Cost of goods sold													3,107.4	3,095.9	3,017.6
Gross profit													1,829.1	1,794.1	1,598.8
Selling, General and Administrative Expense													1,027.8	962.3	842.8
Research and Development Expense													115.8	114.1	98.7
Operating Income (Loss)													685.5	717.7	657.3
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue, Net													0	0	0
Operating activities
Net cash provided by (used for) operating activities													(2,169.7)	(1,510.1)	69.7
Investing activities
Capital expenditures													0	0	0
Proceeds from sale of property and equipment													0	0	0
Proceeds from sale of businesses, net													0	0	0
Acquisitions, net of cash acquired													0	0	0
Intercompany Loan Activity, Net													(217.4)	(476.3)	(596)
Net cash provided by (used for) investing activities of continuing operations													(217.4)	(476.3)	(596)
Net cash provided by (used for) investing activities of discontinued operations													0	0	0
Net cash provided by (used for) investing activities													(217.4)	(476.3)	(596)
Financing activities
Net receipts (repayments) of short-term borrowings													0	0	0
Net receipts (repayments) of commercial paper and revolving long-term debt													0	0	0
Proceeds from long-term debt															0
Repayment of long-term debt													0	0	0
Debt issuance costs															0
Payment for Debt Extinguishment or Debt Prepayment Cost													0
Net change in advances to subsidiaries													2,387.1	1,986.4	526.3
Excess tax benefits from share-based compensation														0	0
Shares issued to employees, net of shares withheld													0	0	0
Repurchases of ordinary shares													0		0
Dividends paid													0	0	0
Net cash provided by (used for) financing activities													2,387.1	1,986.4	526.3
Effect of exchange rate changes on cash and cash equivalents													0	0	0
Change in cash and cash equivalents													0	0	0
Cash and cash equivalents, beginning of year				$ 0				$ 0			$ 0	$ 0	0	0	0
Cash and cash equivalents, end of year	$ 0				$ 0				$ 0				0	0	0	$ 0
Cost of goods sold													0	0	0
Gross profit													0	0	0
Selling, General and Administrative Expense													0	0	0
Research and Development Expense													0	0	0
Operating Income (Loss)													$ 0	$ 0	$ 0

Schedule II - Valuation and 112

Schedule II - Valuation and Qualifying Accounts - Disclosure Table (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		$ 16.4	$ 19	$ 12.1
Additions charged to costs and expenses		0.8	1.2	10.1
Deductions	[1]	4.5	4.1	2.4
Other changes	[2]	1.1	0.3	(0.8)
Ending balance		$ 13.8	$ 16.4	$ 19
[1]	Uncollectible accounts written off, net of recoveries
[2]	Result of foreign currency effects