Pentair (PNR) 10-Q 23 Oct 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2018shares
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
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Trading Symbol	PNR
Entity Common Stock, Shares Outstanding	173,601,030

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 711.4	$ 687.6	$ 2,224.6	$ 2,124.9
Cost of goods sold	467.6	451.1	1,444.9	1,391.1
Gross profit	243.8	236.5	779.7	733.8
Selling, general and administrative	116.3	116.8	399	386.2
Research and development	19.1	17.9	57	54.7
Operating income	108.4	101.8	323.7	292.9
Other (income) expense:
Loss on sale of business	0.2	3.8	6.4	3.8
Loss on early extinguishment of debt	0	0	17.1	101.4
Net interest expense	4.3	13.9	27.9	74.2
Other Income			(1.7)
Other expense	2.1	1.1		3.2
Income from continuing operations before income taxes	101.8	83	274	110.3
Provision for income taxes	10.6	34.1	46.5	52.1
Net income from continuing operations	91.2	48.9	227.5	58.2
Income from discontinued operations, net of tax	18.9	78.2	27	219.8
(Loss) gain from sale of discontinued operations, net of tax	0	1.7	0	(198.9)	$ 181.1
Net income	110.1	125.4	254.5	476.9
Comprehensive income, net of tax
Net income	110.1	125.4	254.5	476.9
Changes in cumulative translation adjustment (inclusive of divestiture of business reclassified to gain from sale of $0.0 and $374.2 for the three and nine months ended September 30, 2017, respectively)	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	$ 107	$ 156.9	$ 276.9	$ 977.4
Earnings (loss) Per Share, Basic
Continuing operations (in dollars per share)	$ 0.52	$ 0.27	$ 1.29	$ 0.32
Discontinued operations (in dollars per share)	0.11	0.42	0.15	2.30
Basic earnings (loss) per ordinary share (in dollars per share)	0.63	0.69	1.44	2.62
Earnings (loss) Per Share, Diluted
Continuing operations (in dollars per share)	0.52	0.27	1.28	0.32
Discontinued operations (in dollars per share)	0.11	0.41	0.15	2.28
Diluted earnings (loss) per ordinary share (in dollars per share)	$ 0.63	$ 0.68	$ 1.43	$ 2.60
Weighted average ordinary shares outstanding
Basic (shares)	174.3	181.5	176.8	181.7
Diluted (shares)	175.7	183.5	178.5	183.7
Cash dividends paid per ordinary share	$ 0.175	$ 0.345	$ 0.875	$ 1.035

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Changes in cumulative translation adjustment inclusive of divestiture of business reclassified to gain from sale	$ 0	$ 0	$ 0	$ 374.2

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 64.7	$ 86.3
Accounts and notes receivable, net of allowances of $16.0 and $14.2, respectively	402.4	483.1
Inventories	387.3	356.9
Other current assets	135.2	114.5
Current assets held for sale	0	708
Total current assets	989.6	1,748.8
Property, plant and equipment, net	274.2	279.8
Other assets
Goodwill	2,097	2,112.8
Intangibles, net	289.4	321.8
Other non-current assets	159.3	180.9
Non-current assets held for sale	0	3,989.6
Total other assets	2,545.7	6,605.1
Total assets	3,809.5	8,633.7
Current liabilities
Accounts payable	261.3	321.5
Employee compensation and benefits	85	115.8
Other current liabilities	361.1	401.3
Current liabilities held for sale	0	360.8
Total current liabilities	707.4	1,199.4
Other liabilities
Long-term debt	798.8	1,440.7
Pension and other post-retirement compensation and benefits	109.8	96.4
Deferred tax liabilities	106.3	108.6
Other non-current liabilities	207	213.8
Non-current liabilities held for sale	0	537
Total liabilities	1,929.3	3,595.9
Equity
Ordinary shares $0.01 par value, 426.0 authorized, 173.6 and 180.3 issued at September 30, 2018 and December 31, 2017, respectively	1.8	1.8
Additional paid-in capital	1,991.9	2,797.7
Retained earnings	107.5	2,481.7
Accumulated other comprehensive loss	(221)	(243.4)
Total equity	1,880.2	5,037.8
Total liabilities and equity	$ 3,809.5	$ 8,633.7

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowances	$ 16	$ 14.2
Ordinary shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	426,000,000	426,000,000
Common shares issued (in shares)	173,600,000	180,300,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 254.5	$ 476.9
Income from discontinued operations, net of tax	(27)	(219.8)
Gain from sale of discontinued operations, net of tax	0	(198.9)
Adjustments to reconcile net income from continuing operations to net cash provided by (used for) operating activities of continuing operations
Equity income of unconsolidated subsidiaries	(7.1)	(0.9)
Depreciation	36.9	38.4
Amortization	27	27.2
Deferred income taxes	(4.1)	(3)
Loss on sale of business	6.4	3.8
Share-based compensation	16.4	32.2
Loss on early extinguishment of debt	17.1	101.4
Changes in assets and liabilities, net of effects of business acquisitions
Accounts and notes receivable	73.5	66.9
Inventories	(36.3)	(16)
Other current assets	(11)	(12.9)
Accounts payable	(60.1)	(61)
Employee compensation and benefits	(25.4)	(17.3)
Other current liabilities	27.7	(54.3)
Other non-current assets and liabilities	10.7	(15.1)
Net cash provided by (used for) operating activities of continuing operations	299.2	147.6
Net cash provided by (used for) operating activities of discontinued operations	(14.6)	214.2
Net cash provided by (used for) operating activities	284.6	361.8
Investing activities
Capital expenditures	(33.8)	(25.4)
Proceeds from sale of property and equipment	(0.4)	3.2
(Payments due to) proceeds from the sale of businesses, net	(12.8)	2,764
Acquisitions, net of cash acquired	(0.9)	(45.9)
Net cash provided by (used for) investing activities of continuing operations	(47.9)	2,695.9
Net cash provided by (used for) investing activities of discontinued operations	(7.1)	(41.3)
Net cash provided by (used for) investing activities	(55)	2,654.6
Financing activities
Net repayments of short-term borrowings	0	(0.8)
Net receipts (repayments) of commercial paper and revolving long-term debt	46	(842.3)
Repayments of long-term debt	(675.1)	(2,009.3)
Debt issuance costs	(2)	0
Premium paid on early extinguishment of debt	(16)	(94.9)
Transfer of cash to nVent	(74.2)	0
Distribution of cash from nVent	993.6	0
Shares issued to employees, net of shares withheld	16	34.3
Repurchases of ordinary shares	(400)	(100)
Dividends paid	(156.7)	(188.9)
Net cash provided by (used for) financing activities of continuing operations	(268.4)	(3,201.9)
Change in cash held for sale	27	(5.6)
Effect of exchange rate changes on cash and cash equivalents	(9.8)	55.5
Change in cash and cash equivalents	(21.6)	(135.6)
Cash and cash equivalents, beginning of period	86.3	$ 216.9
Cash and cash equivalents, end of period	$ 64.7

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Ordinary shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning Balance at Dec. 31, 2016	$ 4,254.4	$ 1.8	$ 2,920.8	$ 2,068.1	$ (736.3)
Beginning Balance (in shares) at Dec. 31, 2016		181.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	476.9			476.9
Other comprehensive income, net of tax	500.5				500.5
Dividends declared	(189.7)			(189.7)
Share repurchase	(100)		(100)
Share repurchase (in shares)		(1.5)
Exercise of options, net of shares tendered for payment	41.6		41.6
Exercise of options, net of shares tendered for payment (in shares)		1.1
Issuance of restricted shares, net of cancellations (in shares)		0.3
Issuance of restricted shares, net of cancellations	0	$ 0
Shares surrendered by employees to pay taxes	(7.3)		(7.3)
Shares surrendered by employees to pay taxes (in shares)		(0.1)
Share-based compensation	32.2		32.2
Ending Balance (in shares) at Sep. 30, 2017		181.6
Ending Balance at Sep. 30, 2017	5,008.6	$ 1.8	2,887.3	2,355.3	(235.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	(214)			(214)
Beginning Balance at Dec. 31, 2017	5,037.8	$ 1.8	2,797.7	2,481.7	(243.4)
Beginning Balance (in shares) at Dec. 31, 2017		180.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	254.5
Other comprehensive income, net of tax	70.3				70.3
Distributions to nVent	(2,776.8)		(438.2)	(2,290.7)	(47.9)
Dividends declared	(124)			(124)
Share repurchase	(400)		(400)
Share repurchase (in shares)		(7.8)
Exercise of options, net of shares tendered for payment	22.8		22.8
Exercise of options, net of shares tendered for payment (in shares)		0.8
Issuance of restricted shares, net of cancellations (in shares)		0.3
Issuance of restricted shares, net of cancellations	0	$ 0
Shares surrendered by employees to pay taxes	(6.8)		(6.8)
Shares surrendered by employees to pay taxes (in shares)		0
Share-based compensation	16.4		16.4
Ending Balance (in shares) at Sep. 30, 2018		173.6
Ending Balance at Sep. 30, 2018	$ 1,880.2	$ 1.8	$ 1,991.9	$ 107.5	$ (221)

Basis of Presentation and Respo

Basis of Presentation and Responsibility for Interim Financial Statements	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation and Responsibility for Interim Financial Statements	Basis of Presentation and Responsibility for Interim Financial Statements The accompanying unaudited condensed consolidated financial statements of Pentair plc and its subsidiaries (“we,” “us,” “our,” “Pentair,” or the “Company”) have been prepared following the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the United States of America (“GAAP”) can be condensed or omitted. We are responsible for the unaudited condensed consolidated financial statements included in this document. The financial statements include all normal recurring adjustments that are considered necessary for the fair presentation of our financial position and operating results. As these are condensed financial statements, one should also read our consolidated financial statements and notes thereto, which are included in our Annual Report on Form 10-K for the year ended December 31, 2017 . Revenues, expenses, cash flows, assets and liabilities can and do vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be indicative of those for a full year. Our fiscal year ends on December 31. We report our interim quarterly periods on a calendar quarter basis. Electrical separation On April 30, 2018, Pentair completed the previously announced separation of its Electrical business from the rest of Pentair (the “Separation”) by means of a dividend in specie of the Electrical business, which was effected by the transfer of the Electrical business from Pentair to nVent Electric plc (“nVent”) and the issuance by nVent of ordinary shares directly to Pentair shareholders (the “Distribution”). On May 1, 2018, following the Separation and Distribution, nVent became an independent publicly traded company, trading on the New York Stock Exchange under the symbol “NVT.” The Company did not retain any equity interest in nVent. nVent’s historical financial results are reflected in the Company’s condensed consolidated financial statements as a discontinued operation. Refer to Note 3 for further discussion. In connection with the Distribution of nVent, the Company and nVent entered into several agreements covering administrative and tax matters to provide or obtain services on a transitional basis, as needed, for varying periods after the Distribution. The administrative agreements cover various services such as information technology, human resources and finance. The Company expects all services to be substantially complete within one year after the Distribution. Adoption of new accounting standards On January 1, 2018, we adopted Accounting Standards Update (“ASU”) No. 2017-07, “Retirement Benefits-Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” As a result of the adoption, the interest cost, expected return on plan assets and net actuarial gain/loss components of net periodic pension and post-retirement benefit cost have been reclassified from Selling, general and administrative expense to Other expense (income) . Only the service cost component remains in Operating income and will be eligible for capitalization in assets on a prospective basis. The effect of the retrospective presentation change related to the net periodic cost of our defined benefit pension and other post-retirement plans on our Condensed Consolidated Statements of Operations and Comprehensive Income was a reclassification of $1.4 million and $4.1 million for the three and nine months ended September 30, 2017, respectively, from Selling, general and administrative expense to Other expense (income) . On January 1, 2018, we adopted ASU No. 2016-16, “Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory.” This ASU requires the tax effects of all intra-entity sales of assets other than inventory to be recognized in the period in which the transaction occurs. The adoption resulted in a $215.8 million cumulative-effect adjustment (of which $174.6 million related to nVent) recorded in retained earnings as of the beginning of 2018. The adjustment reflects a $254.3 million reduction of a prepaid long term tax asset, partially offset by the establishment of $38.5 million of deferred tax assets. On January 1, 2018, we adopted ASU No. 2014-09, “Revenue from Contracts with Customers” and the related amendments (“ASC 606” or “the new revenue standard”) using the modified retrospective method. The cumulative impact to our retained earnings at January 1, 2018 was not material. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new standard to be immaterial to our net income on an ongoing basis. A majority of our net sales continue to be recognized when products are shipped from our manufacturing facilities or delivery has occurred, depending on terms of the sale. Under the new revenue standard, timing for recognition of certain revenue may be accelerated such that a portion of revenue will be recognized prior to shipment or delivery dependent upon contract-specific terms. The cumulative effect of the changes made to our January 1, 2018 Condensed Consolidated Balance Sheet from the modified retrospective adoption of ASU 2016-16 and ASU 2014-09 was as follows: Condensed Consolidated Balance Sheets In millions Balance at December 31, 2017 Adjustments due to ASU 2016-16 Adjustments due to ASU 2014-09 Balance at January 1, 2018 Assets Accounts and notes receivable, net $ 483.1 $ — $ 2.7 $ 485.8 Inventories 356.9 — (1.6 ) 355.3 Other current assets 114.5 — 1.6 116.1 Current assets held for sale 708.0 — 3.8 711.8 Other non-current assets 180.9 (44.9 ) — 136.0 Non-current assets held for sale 3,989.6 (201.6 ) — 3,788.0 Liabilities Other current liabilities 401.3 — 2.7 404.0 Deferred tax liabilities 108.6 (3.7 ) 0.1 105.0 Non-current liabilities held for sale 537.0 (27.0 ) 0.4 510.4 Equity Retained Earnings 2,481.7 (215.8 ) 1.8 2,267.7 New accounting standards issued but not yet adopted In February 2016, the Financial Accounting Standards Board issued ASU 2016-02, “Leases” (“the new lease standard” or “ASC 842”), which requires an entity to recognize both assets and liabilities arising from financing and operating leases, along with additional qualitative and quantitative disclosures. The new lease standard requirements are effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and early adoption is permitted. The Company has begun evaluating the new lease standard, including the review and implementation of the necessary changes to our existing processes and systems that will be required to implement the new lease standard. While we are unable to quantify the impact at this time, we expect the primary impact upon adoption will be the recognition, on a discounted basis, of our minimum commitments under noncancelable operating leases on our consolidated balance sheets resulting in the recording of right of use assets and lease obligations. We currently do not expect ASC 842 to have a material effect on either our condensed consolidated statements of operations and comprehensive income or condensed consolidated statements of cash flows. We plan to adopt ASC 842 in the first quarter of 2019.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Revenue recognition Revenue is recognized when control of the promised goods or services are transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for transferring those goods or providing services. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. When determining whether the customer has obtained control of the goods or services, we consider any future performance obligations. 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 Pentair has substantially accomplished what it must do to be entitled to the benefits represented by the revenue. Performance obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. For contracts with multiple performance obligations, standalone selling price is generally readily observable. Our performance obligations are satisfied at a point in time or over time as work progresses. Revenue from goods and services transferred to customers at a point in time accounted for 90.5% and 91.3% of our revenue for the three months ended September 30, 2018 and 2017 , respectively, and 92.3% and 92.8% of our revenue for the nine months ended September 30, 2018 and 2017 , respectively. Revenue on these contracts is recognized when obligations under the terms of the contract with our customer are satisfied; generally this occurs with the transfer of control upon shipment. Revenue from products and services transferred to customers over time accounted for 9.5% and 8.7% of our revenue for the three months ended September 30, 2018 and 2017 , respectively, and 7.7% and 7.2% of our revenue for the nine months ended September 30, 2018 and 2017 , respectively. For the majority of our revenue recognized over time, we use an input measure to determine progress towards completion. Under this method, sales and gross profit are recognized as work is performed generally 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. Contract costs include labor, material, overhead and, when appropriate, general and administrative expenses. 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. For performance obligations related to long term contracts, when estimates of total costs to be incurred on a performance obligation exceed total estimates of revenue to be earned, a provision for the entire loss on the performance obligation is recognized in the period the loss is determined. On September 30, 2018 , we had $69.1 million of remaining performance obligations on contracts with an original expected duration of one year or more. We expect to recognize the majority of our remaining performance obligations on these contracts within the next 12 to 18 months . 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. When the right of return exists, we adjust the transaction price for the estimated effect of returns. We estimate the expected returns based on 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 Our sales contracts may give customers the option to purchase additional goods or services priced at a discount. Options to acquire additional goods or services at a discount can come in many forms, such as customer programs and incentive offerings including pricing arrangements, promotions and other volume-based incentives. We reduce the transaction price for certain customer programs and incentive offerings including pricing arrangements, promotions and other volume-based incentives that represent variable consideration. Sales incentives given to our customers are recorded using either the expected value method or most likely amount approach for estimating the amount of consideration to which Pentair shall be entitled. The expected value is the sum of probability-weighted amounts in a range of possible consideration amounts. An expected value is an appropriate estimate of the amount of variable consideration when there are a large number of contracts with similar characteristics. The most likely amount is the single most likely amount in a range of possible consideration amounts (that is, the single most likely outcome of the contract). The most likely amount is an appropriate estimate of the amount of variable consideration if the contract has limited possible outcomes (for example, an entity either achieves a performance bonus or does not). 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, one of our businesses allows customers to apply for a refund of a percentage of the original purchase price if they can demonstrate sales to a qualifying end customer. We use the expected value method to 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 of the transaction price. 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 reforecast the most likely amount of the rebate to be paid based on forecasted sales levels. These forecasts are updated at least quarterly for each customer, and the transaction price is 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 activities after the customer obtains control are treated as a promised service performance obligation and recorded in Net sales in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Income. Shipping and handling costs incurred by Pentair for the delivery of goods to customers are considered a cost to fulfill the contract and are included in Cost of goods sold in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Income. Contract assets and liabilities Contract assets consist of unbilled amounts resulting from sales under long-term contracts when the cost-to-cost method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the customer, such as when the customer retains a small portion of the contract price until completion of the contract. We typically receive interim payments on sales under long-term contracts as work progresses, although for some contracts, we may be entitled to receive an advance payment. Contract liabilities consist of advanced payments, billings in excess of costs incurred and deferred revenue. Contract assets are recorded within Other current assets , and contract liabilities are recorded within Other current liabilities in the Condensed Consolidated Balance Sheets. Contract assets and liabilities consisted of the following: In millions September 30, December 31, $ Change % Change Contract assets $ 44.8 $ 51.5 $ (6.7 ) (13.0 )% Contract liabilities 25.5 29.1 (3.6 ) (12.4 )% Net contract assets $ 19.3 $ 22.4 $ (3.1 ) (13.8 )% The $3.1 million decrease in net contract assets from December 31, 2017 to September 30, 2018 was primarily the result of timing of milestone payments. Approximately 65% of our contract liabilities at December 31, 2017 were recognized in revenue in the first nine months of 2018 . There were no impairment losses recognized on our contract assets for the three and nine months ended September 30, 2018 . Practical expedients and exemptions We generally expense incremental costs of obtaining a contract when incurred because the amortization period would be less than one year. These costs primarily relate to sales commissions and are recorded in Selling, general and administrative expense in the Condensed Consolidated Statements of Operations and Comprehensive Income. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. Further, we do not adjust the promised amount of consideration for the effects of a significant financing component if we expect, at contract inception, that the period between when we transfer a promised good or service to a customer and when the customer pays for that good or service will be one year or less. Revenue by category We disaggregate our revenue from contracts with customers by segment, geographic location and vertical market, as we believe these best depict how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Refer to Note 14 for revenue disaggregated by segment. Geographic net sales information, based on geographic destination of the sale, was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, U.S. $ 438.5 $ 417.4 $ 1,395.1 $ 1,317.8 Western Europe 97.1 92.8 311.2 287.7 Developing (1) 117.6 117.3 346.0 346.0 Other Developed (2) 58.2 60.1 172.3 173.4 Consolidated net sales $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9 (1) Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia. (2) Other Developed includes Australia, Canada and Japan. Vertical market net sales information was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Residential $ 397.6 $ 375.5 $ 1,247.3 $ 1,185.1 Commercial 155.8 148.6 475.4 453.8 Industrial 158.0 163.5 501.9 486.0 Consolidated net sales $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Electrical separation On April 30, 2018, the Company completed the previously announced separation of the Electrical business from the rest of Pentair by means of a dividend in specie of the Electrical business, which was effected by the transfer of the Electrical business from Pentair to nVent and the issuance by nVent of nVent ordinary shares directly to Pentair shareholders. We did not retain an equity interest in nVent. The results of the Electrical business have been presented as discontinued operations and the related assets and liabilities were reclassified as held for sale for all periods presented. The Electrical business had been previously disclosed as a stand-alone reporting segment. Separation costs related to the Separation and Distribution were $2.5 million and $11.7 million for the three months ended September 30, 2018 and 2017 , respectively, and $82.4 million and $19.3 million for the nine months ended September 30, 2018 and 2017 , respectively. These costs are reported in discontinued operations as they represent a cost directly related to the Separation and Distribution and were included within Income from discontinued operations, net of tax presented below. Sale of Valves & Controls 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. The Valves & Controls business was previously disclosed as a stand-alone reporting segment. Transaction costs of $1.7 million and $55.4 million related to the sale of Valves & Controls were incurred during the three and nine months ended September 30, 2017, respectively, and were recorded within (Loss) gain from sale of discontinued operations before income taxes presented below. Operating results of discontinued operations are summarized below: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Net sales $ — $ 540.7 $ 693.9 $ 2,006.3 Cost of goods sold — 321.9 424.0 1,268.9 Gross profit — 218.8 269.9 737.4 Selling, general and administrative 2.5 115.7 233.5 440.6 Research and development — 10.5 14.6 38.1 Operating (loss) income $ (2.5 ) $ 92.6 $ 21.8 $ 258.7 Income from discontinued operations before income taxes $ 14.8 $ 91.8 $ 34.6 $ 257.1 Income tax (benefit) provision (4.1 ) 13.6 7.6 37.3 Income from discontinued operations, net of tax $ 18.9 $ 78.2 $ 27.0 $ 219.8 (Loss) gain from sale of discontinued operations before income taxes $ — $ (1.7 ) $ — $ 201.3 Provision for income taxes — — — 2.4 (Loss) gain from sale of discontinued operations before income taxes $ — $ (1.7 ) $ — $ 198.9 The carrying amounts of major classes of assets and liabilities that were classified as held for sale on the Condensed Consolidated Balance Sheets were as follows: In millions December 31, Cash and cash equivalents $ 27.0 Accounts and notes receivable, net 348.5 Inventories 224.1 Other current assets 108.4 Current assets held for sale $ 708.0 Property, plant and equipment, net $ 265.8 Goodwill 2,238.2 Intangibles, net 1,236.6 Other non-current assets 249.0 Non-current assets held for sale $ 3,989.6 Accounts payable $ 174.1 Employee compensation and benefits 70.8 Other current liabilities 115.9 Current liabilities held for sale $ 360.8 Pension and other post-retirement compensation and benefits $ 189.2 Deferred tax liabilities 286.2 Other non-current liabilities 61.6 Non-current liabilities held for sale $ 537.0

Share Plans

Share Plans	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Plans	Share Plans Total share-based compensation expense for the three and nine months ended September 30, 2018 and 2017 was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Restricted stock units $ 2.4 $ 2.9 $ 6.7 $ 14.4 Stock options 1.3 1.9 3.5 8.3 Performance share units 1.4 1.4 6.2 9.5 Total share-based compensation expense $ 5.1 $ 6.2 $ 16.4 $ 32.2 Of the total share-based compensation expense noted above, $0.0 million and $1.7 million for the three months ended September 30, 2018 and 2017 , respectively, and $3.4 million and $6.0 million for the nine months ended September 30, 2018 and 2017 , respectively, was reported as part of Income from discontinued operations, net of tax . In May 2018, we issued our annual share-based compensation grants under the Pentair plc 2012 Stock and Incentive Plan to eligible employees. The total number of awards issued was approximately 0.8 million , of which 0.2 million were restricted stock units (“RSUs”), 0.5 million were stock options and 0.1 million were performance share units (“PSUs”). The weighted-average grant date fair value of the RSUs, stock options and PSUs issued was $45.42 , $10.92 , and $45.42 , respectively. We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions: 2018 Annual Grant Risk-free interest rate 2.58 % Expected dividend yield 1.56 % Expected share price volatility 24.8 % Expected term (years) 6.1 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 share price volatility, we considered a rolling average of historical volatility measured over a period approximately equal to the expected option term. The risk-free interest 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. Electrical separation In connection with the Separation and Distribution, the Company adjusted its outstanding equity awards on May 1, 2018 in accordance with the Employee Matters Agreement between Pentair and nVent. The outstanding awards will continue to vest over the original vesting period, which is generally three years from the grant date. The RSUs, PSUs, and stock option awards issued before May 9, 2017 (the date of Pentair’s announcement of its intention to separate its Water and Electrical businesses) were converted into awards of both Pentair and nVent regardless of which company the award holder was employed by immediately after the Separation. These awards were converted as follows: • Restricted stock units : For every unvested Pentair RSU award held, the holder received one nVent RSU. • Performance share units : Pentair PSUs were converted to Pentair RSUs immediately after the Distribution. The PSUs granted in 2016 were converted at rate of 125% of target, and the PSUs granted in 2017 were converted at a rate of 100% of target. For every converted RSU, the shareholder also received one nVent RSU. The converted RSUs retain the original vesting schedule of the awarded PSUs. • Stock options: Every holder of unexercised (vested and unvested) Pentair stock options received both adjusted stock options of Pentair and stock options of nVent, with the number of underlying shares and the exercise price adjusted accordingly to preserve the overall intrinsic value of the awards. The number of Pentair stock options was converted based upon the ratio of Pentair’s pre-Distribution stock price divided by the sum of the Pentair and nVent post-Distribution closing prices. The exercise price for the converted Pentair stock options was adjusted based on the Pentair post-Distribution closing price divided by the Pentair pre-Distribution closing price. The number of new nVent stock options awarded is the same as the converted number of Pentair stock options calculated as described above. The exercise price for the new nVent stock options was calculated based on nVent’s post-Distribution closing price divided by the Pentair pre-Distribution closing price. Generally, unvested awards issued after May 9, 2017 were converted to awards of the Company that the shareholder was employed by immediately after the Separation, with adjustments to the number of underlying shares as appropriate to preserve the intrinsic value of such awards immediately prior to the Distribution. The adjustment of the underlying shares was based on the ratio of Pentair’s pre-Distribution stock price divided by the post-Distribution closing price of the respective company’s ordinary shares. The exercise prices of the stock options were converted using the inverse ratio in a manner designed to preserve the intrinsic value of such awards.
Share-based Compensation Expense	Total share-based compensation expense for the three and nine months ended September 30, 2018 and 2017 was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Restricted stock units $ 2.4 $ 2.9 $ 6.7 $ 14.4 Stock options 1.3 1.9 3.5 8.3 Performance share units 1.4 1.4 6.2 9.5 Total share-based compensation expense $ 5.1 $ 6.2 $ 16.4 $ 32.2

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During the nine months ended September 30, 2018 and the year ended December 31, 2017 , we initiated and continued execution of certain business restructuring initiatives aimed at reducing our fixed cost structure and realigning our business. Initiatives during the nine months ended September 30, 2018 and the year ended December 31, 2017 included the reduction in hourly and salaried headcount of approximately 300 employees and 250 employees, respectively. Restructuring related costs included in Selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income included costs for severance and other restructuring costs as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Severance and related costs $ 2.8 $ 1.3 $ 12.8 $ 18.7 Other 0.7 0.1 21.3 0.2 Total restructuring costs $ 3.5 $ 1.4 $ 34.1 $ 18.9 Other restructuring costs primarily consist of asset impairment and various contract termination costs. Restructuring costs by reportable segment were as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Aquatic Systems $ 0.6 $ 0.3 $ 3.6 $ 1.9 Filtration Solutions 0.9 0.2 14.4 6.9 Flow Technologies 0.7 0.9 8.7 2.8 Other 1.3 — 7.4 7.3 Consolidated $ 3.5 $ 1.4 $ 34.1 $ 18.9 Activity related to accrued severance and related costs recorded in Other current liabilities in the Condensed Consolidated Balance Sheets is summarized as follows for the nine months ended September 30, 2018 : In millions September 30, Beginning balance $ 34.5 Costs incurred 12.8 Cash payments and other (16.7 ) Ending balance $ 30.6

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic and diluted earnings per share were calculated as follows: Three months ended Nine months ended In millions, except per-share data September 30, September 30, September 30, September 30, Net income $ 110.1 $ 125.4 $ 254.5 $ 476.9 Net income from continuing operations $ 91.2 $ 48.9 $ 227.5 $ 58.2 Weighted average ordinary shares outstanding Basic 174.3 181.5 176.8 181.7 Dilutive impact of stock options, restricted stock units and performance share units 1.4 2.0 1.7 2.0 Diluted 175.7 183.5 178.5 183.7 Earnings per ordinary share Basic Continuing operations $ 0.52 $ 0.27 $ 1.29 $ 0.32 Discontinued operations 0.11 0.42 0.15 2.30 Basic earnings per ordinary share $ 0.63 $ 0.69 $ 1.44 $ 2.62 Diluted Continuing operations $ 0.52 $ 0.27 $ 1.28 $ 0.32 Discontinued operations 0.11 0.41 0.15 2.28 Diluted earnings per ordinary share $ 0.63 $ 0.68 $ 1.43 $ 2.60 Anti-dilutive stock options excluded from the calculation of diluted earnings per share 1.3 1.6 0.6 1.8

Supplemental Balance Sheet Info

Supplemental Balance Sheet Information	9 Months Ended
	Sep. 30, 2018
Disclosure Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information	Supplemental Balance Sheet Information In millions September 30, December 31, Inventories Raw materials and supplies $ 205.9 $ 190.8 Work-in-process 66.2 57.9 Finished goods 115.2 108.2 Total inventories $ 387.3 $ 356.9 Other current assets Cost in excess of billings $ 44.8 $ 51.5 Prepaid expenses 59.4 51.4 Prepaid income taxes 12.5 7.8 Other current assets 18.5 3.8 Total other current assets $ 135.2 $ 114.5 Property, plant and equipment, net Land and land improvements $ 34.0 $ 33.5 Buildings and leasehold improvements 179.0 184.3 Machinery and equipment 614.2 609.6 Construction in progress 34.8 23.7 Total property, plant and equipment 862.0 851.1 Accumulated depreciation and amortization 587.8 571.3 Total property, plant and equipment, net $ 274.2 $ 279.8 Other non-current assets Prepaid income taxes $ — $ 52.8 Deferred income taxes 29.6 29.0 Deferred compensation plan assets 27.5 23.2 Other non-current assets 102.2 75.9 Total other non-current assets $ 159.3 $ 180.9 Other current liabilities Dividends payable $ 30.4 $ 63.1 Accrued warranty 38.0 38.1 Accrued rebates 65.9 49.8 Billings in excess of cost 15.9 20.1 Income taxes payable 24.3 39.7 Accrued restructuring 30.6 34.5 Other current liabilities 156.0 156.0 Total other current liabilities $ 361.1 $ 401.3 Other non-current liabilities Income taxes payable $ 51.0 $ 61.3 Self-insurance liabilities 59.4 48.3 Deferred compensation plan liabilities 27.5 23.2 Foreign currency contract liabilities 45.5 47.2 Other non-current liabilities 23.6 33.8 Total other non-current liabilities $ 207.0 $ 213.8

Goodwill and Other Identifiable

Goodwill and Other Identifiable Intangible Assets	9 Months Ended
	Sep. 30, 2018
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 by reportable segment were as follows: In millions December 31, Foreign currency translation/other September 30, Aquatic Systems $ 973.1 $ (6.0 ) $ 967.1 Filtration Solutions 472.1 (7.9 ) 464.2 Flow Technologies 667.6 (1.9 ) 665.7 Total goodwill $ 2,112.8 $ (15.8 ) $ 2,097.0 Identifiable intangible assets consisted of the following: September 30, December 31, In millions Cost Accumulated amortization Net Cost Accumulated amortization Net Definite-life intangibles Customer relationships $ 353.3 $ (245.5 ) $ 107.8 $ 360.9 $ (229.9 ) $ 131.0 Trade names 0.4 (0.4 ) — 1.5 (1.4 ) 0.1 Proprietary technology and patents 88.0 (68.2 ) 19.8 117.0 (89.3 ) 27.7 Total definite-life intangibles 441.7 (314.1 ) 127.6 479.4 (320.6 ) 158.8 Indefinite-life intangibles Trade names 161.8 — 161.8 163.0 — 163.0 Total intangibles $ 603.5 $ (314.1 ) $ 289.4 $ 642.4 $ (320.6 ) $ 321.8 Identifiable intangible asset amortization expense was $8.6 million and $9.2 million for the three months ended September 30, 2018 and 2017 , respectively, and $27.0 million and $27.2 million for the nine months ended September 30, 2018 and 2017 , respectively. Estimated future amortization expense for identifiable intangible assets during the remainder of 2018 and the next five years is as follows: Q4 In millions 2018 2019 2020 2021 2022 2023 Estimated amortization expense $ 8.3 $ 28.0 $ 22.9 $ 17.6 $ 10.3 $ 7.9

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Debt and the average interest rates on debt outstanding were as follows: In millions Average interest rate as of September 30, 2018 Maturity Year September 30, December 31, Commercial paper 2.934% 2023 $ 99.0 $ 34.0 Revolving credit facilities 3.461% 2023 9.4 28.4 Senior notes - fixed rate (1) 2.900% 2018 — 255.3 Senior notes - fixed rate (1) 2.650% 2019 250.0 250.0 Senior notes - fixed rate - Euro (1) 2.450% 2019 160.4 594.4 Senior notes - fixed rate (1) 3.625% 2020 74.0 74.0 Senior notes - fixed rate (1) 5.000% 2021 103.8 103.8 Senior notes - fixed rate (1) 3.150% 2022 88.3 88.3 Senior notes - fixed rate (1) 4.650% 2025 19.3 19.3 Other N/A N/A 0.1 — Unamortized debt issuance costs and discounts N/A N/A (5.5 ) (6.8 ) Total debt $ 798.8 $ 1,440.7 (1) Senior notes are guaranteed as to payment by Pentair and PISG On April 25, 2018, Pentair, Pentair Investments Switzerland GmbH (“PISG”), Pentair Finance S.à r.l. (“PFSA”) and Pentair, Inc. entered into a credit agreement, providing for a five -year $800.0 million senior unsecured revolving credit facility (the “Senior Credit Facility”), with Pentair and PISG as guarantors and PFSA and Pentair, Inc. as borrowers. The Senior Credit Facility replaced PFSA’s existing credit facility under that certain Amended and Restated Credit Agreement, dated as of October 3, 2014. PFSA has the option to request to increase the Senior Credit Facility in an aggregate amount of up to $300.0 million , subject to customary conditions, including the commitment of the participating lenders. The Senior Credit Facility has a maturity date of April 25, 2023. Borrowings under the Senior Credit Facility bear interest at a rate equal to an adjusted base rate or the London Interbank Offered Rate, plus, in each case, an applicable margin. The applicable margin is based on, at PFSA’s election, Pentair’s leverage level or PFSA’s public credit rating. PFSA is authorized to sell short-term commercial paper notes to the extent availability exists under the Senior Credit Facility. PFSA uses the Senior Credit Facility as back-up liquidity to support 100% of commercial paper outstanding. PFSA had $99.0 million of commercial paper outstanding as of September 30, 2018 and $34.0 million as of December 31, 2017 , all of which was classified as long-term debt as we have the intent and the ability to refinance such obligations on a long-term basis under the Senior Credit Facility. Our debt agreements contain various financial covenants, but the most restrictive covenants are contained in the Senior Credit Facility. The Senior Credit Facility contains covenants requiring us not to permit (i) the ratio of our consolidated debt (net of its consolidated unrestricted cash in excess of $5.0 million but not to exceed $250.0 million ) to our consolidated net income (excluding, among other things, non-cash gains and losses) before interest, taxes, depreciation, amortization and non-cash share-based compensation expense (“EBITDA”) on the last day of any period of four consecutive fiscal quarters to exceed 3.75 to 1.00 (the “Leverage Ratio”) and (ii) the ratio of our EBITDA to our consolidated interest expense, 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 Senior 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 September 30, 2018 , we were in compliance with all financial covenants in our debt agreements . Total availability under the Senior Credit Facility was $691.6 million as of September 30, 2018 . In addition to the Senior Credit Facility, we have various other credit facilities with an aggregate availability of $21.1 million , of which there were no outstanding borrowings at September 30, 2018 . Borrowings under these credit facilities bear interest at variable rates. In June 2018, we used the $993.6 million of cash received from nVent as a result of the Distribution to pay down commercial paper and revolving credit facilities, redeem the remaining $255.3 million aggregate principal of our 2.9% fixed rate senior notes due 2018, and we completed a cash tender offer in the amount of €363.4 million aggregate principal of our 2.45% senior notes due 2019. All costs associated with the repurchases of debt were recorded as a Loss on early extinguishment of debt in the Condensed Consolidated Statements of Operations and Comprehensive Income , including $16.0 million premium paid on early extinguishment and $1.1 million of unamortized deferred financing costs. Debt outstanding, excluding unamortized issuance costs and discounts, at September 30, 2018 matures on a calendar year basis as follows: Q4 In millions 2018 2019 2020 2021 2022 2023 Thereafter Total Contractual debt obligation maturities $ — $ 410.5 $ 74.0 $ 103.8 $ 88.3 $ 108.4 $ 19.3 $ 804.3

Derivatives and Financial Instr

Derivatives and Financial Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [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 exchange 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. At September 30, 2018 and December 31, 2017 , we had outstanding foreign currency derivative contracts with gross national U.S. dollar equivalent amounts of $361.6 million and $481.4 million , respectively. The impact of these contracts on the Condensed Consolidated Statements of Operations and Comprehensive Income was not material for any period presented. Gains or losses on foreign currency contracts designated as hedges are reclassified out of Accumulated Other Comprehensive Loss (“AOCI”) and into Selling, general and administrative expense in the Condensed Consolidated Statements of Operations and Comprehensive Income upon settlement. Such reclassifications during the three and nine months ended September 30, 2018 and 2017 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. In June 2018, the Company completed a tender offer for €363.4 million of the 2019 Euro Notes. The remaining €136.6 million of the 2019 Euro Notes have been re-designated as a net investment hedge 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 September 30, 2018 and December 31, 2017 , we had deferred foreign currency losses of $6.1 million and $29.6 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 instruments: • 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, were as follows: September 30, December 31, In millions Recorded Amount Fair Value Recorded Amount Fair Value Variable rate debt $ 108.5 $ 108.5 $ 62.4 $ 62.4 Fixed rate debt 695.8 698.7 1,385.1 1,424.0 Total debt $ 804.3 $ 807.2 $ 1,447.5 $ 1,486.4 Financial assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows: September 30, 2018 In millions Level 1 Level 2 Level 3 Total Recurring fair value measurements Foreign currency contract liabilities $ — $ (45.5 ) $ — $ (45.5 ) Deferred compensation plan assets 24.3 3.2 — 27.5 Total recurring fair value measurements $ 24.3 $ (42.3 ) $ — $ (18.0 ) December 31, 2017 In millions Level 1 Level 2 Level 3 Total Recurring fair value measurements Foreign currency contract assets $ — $ 0.6 $ — $ 0.6 Foreign currency contract liabilities — (47.2 ) — (47.2 ) Deferred compensation plan assets 18.7 4.5 — 23.2 Total recurring fair value measurements $ 18.7 $ (42.1 ) $ — $ (23.4 ) 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 $8.8 million for a trade name intangible in 2017. The impairment charge reduced the carrying value of the impacted trade name intangible to $10.8 million . 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	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We manage our affairs so that we are centrally managed and controlled in the United Kingdom (“U.K.”) and therefore have our tax residency in the U.K. The provision for income taxes consists of provisions for the U.K. and international income taxes. We operate in an international environment with operations in various locations outside the U.K. Accordingly, the consolidated income tax rate is a composite rate reflecting the earnings in the various locations and the applicable rates. The effective income tax rate for the nine months ended September 30, 2018 was 17.0% , compared to 47.2% for the nine months ended September 30, 2017 . We continue to actively pursue initiatives to reduce our effective tax rate. The tax rate in any quarter can be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution. The liability for uncertain tax positions was $52.8 million and $12.0 million at September 30, 2018 and December 31, 2017 , respectively. The increase was primarily due to the establishment of uncertain tax positions with the Internal Revenue Service and other jurisdictions. We record penalties and interest related to unrecognized tax benefits in Provision for income taxes and Net interest expense , respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income, which is consistent with our past practices. U.S. tax reform 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. For 2018, the Company considered in its estimated annual effective tax rate additional provisions of the Act including changes to the deduction for executive compensation and interest expense, a tax on global intangible low-taxed income provisions (“GILTI”), the base erosion anti-abuse tax, and a deduction for foreign-derived intangible income. The Company has elected to treat tax on GILTI income as a period cost and has therefore included it in its annual estimated effective tax rate. Given the significance of the Act, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of 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 calculated its best estimate of the impact of the Act in its December 31, 2017 income tax provision in accordance with its understanding of the Act and guidance available as of the date of the filing of the Annual Report on Form 10-K and as a result recorded a provisional income tax expense of $2.2 million in the fourth quarter of 2017, the period in which the legislation was enacted. For the three months ended September 30, 2018, we recorded a $3.6 million decrease to the provisional income tax expense. 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 $28.0 million . The remeasurement of deferred taxes requires further analysis regarding the state tax impacts of the remeasurement 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 $26.6 million . The determination of the transition tax requires additional analysis regarding state tax impacts, which is expected to be completed in the fourth quarter 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	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans Components of net periodic benefit cost for our pension plans for the three and nine months ended September 30, 2018 and 2017 were as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Service cost $ 1.0 $ 2.9 $ 3.1 $ 8.8 Interest cost 3.0 4.1 9.0 12.3 Expected return on plan assets (2.2 ) (2.9 ) (6.7 ) (8.7 ) Actuarial loss 2.2 — 2.2 — Net periodic benefit cost $ 4.0 $ 4.1 $ 7.6 $ 12.4 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. Salaried Plan participants whose benefits were not in pay status by July 1, 2018 were given the opportunity to elect a lump-sum (or monthly annuity) payment during a special election window. During the third quarter of 2018, lump-sum payments of $171.9 million resulted in interim mark-to-market accounting for the Salaried Plan. The mark-to-market adjustment is reflected within Actuarial loss in the table above. As described in Note 1, during the first quarter of 2018, the Company adopted ASU 2017-07. As a result, service costs are classified as employee compensation costs within Cost of goods sold and Selling, general and administrative expense within the Condensed Consolidated Statements of Operations and Comprehensive Income. All other components of net periodic benefit cost are classified within Other expense (income) for the periods presented. Components of net periodic benefit cost for our other post-retirement plans for the three and nine months ended September 30, 2018 and 2017 were not material.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2018
Shareholders' Equity	Shareholders’ Equity 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 “2014 Authorization”). On May 8, 2018, the Board of Directors authorized the repurchase of our ordinary shares up to a maximum dollar limit of $750.0 million (the “2018 Authorization”), replacing the 2014 Authorization. The 2018 Authorization expires on May 31, 2021 . During the nine months ended September 30, 2018 , we repurchased 7.8 million of our shares for $400.0 million , of which 2.2 million shares, or $150.0 million , and 5.6 million shares, or $250.0 million , were repurchased pursuant to the 2014 and 2018 Authorizations, respectively. As of September 30, 2018 , we had $500.0 million available for share repurchases under the 2018 Authorization. Dividends payable On September 18, 2018 , the Board of Directors declared a quarterly cash dividend of $0.175 , which reflects an adjustment for the Distribution, payable on November 2, 2018 to shareholders of record at the close of business on October 19, 2018 . As a result, the balance of dividends payable included in Other current liabilities on our Condensed Consolidated Balance Sheets was $30.4 million and $63.1 million at September 30, 2018 and December 31, 2017 , respectively.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Effective May 1, 2018, we reorganized our business segments to reflect a new operating structure, resulting in a change to our reporting segments. All prior period amounts related to the segment change have been retrospectively reclassified to conform to the new presentation. As part of this reorganization the legacy Water segment was separated into three reportable business segments: • Aquatic Systems — This segment manufactures and sells a complete line of energy-efficient residential and commercial pool equipment and accessories including pumps, filters, heaters, lights, automatic controls, automatic cleaners, maintenance equipment and pool accessories. Applications for our Aquatic Systems products include residential and commercial pool maintenance, pool repair, renovation, service and construction and aquaculture solutions. • Filtration Solutions — This segment manufactures and sells water and fluid treatment products and systems, including pressure tanks and vessels, control valves, activated carbon products, conventional filtration products, point-of-entry and point-of-use systems, gas recovery solutions, membrane bioreactors, wastewater reuse systems and advanced membrane filtration and separation systems into the global residential, industrial and commercial markets. These products are used in a range of applications, including use in fluid filtration, ion exchange, desalination, food and beverage, food service and separation technologies for the oil and gas industry. • Flow Technologies — This segment manufactures and sells products ranging from light duty diaphragm pumps to high-flow turbine pumps and solid handling pumps while serving the global residential, commercial and industrial markets. These pumps are used in a range of applications, including residential and municipal wells, water treatment, wastewater solids handling, pressure boosting, fluid delivery, circulation and transfer, fire suppression, flood control, agricultural irrigation and crop spray. We evaluate performance based on 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, impairments and other unusual non-operating items. Financial information by reportable segment is as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Net sales Aquatic Systems $ 232.7 $ 211.8 $ 749.3 $ 688.0 Filtration Solutions 240.4 242.4 754.1 737.0 Flow Technologies 238.0 233.0 720.2 698.8 Other 0.3 0.4 1.0 1.1 Consolidated $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9 Segment income (loss) Aquatic Systems $ 59.9 $ 53.1 $ 199.5 $ 182.9 Filtration Solutions 38.4 40.4 124.4 113.4 Flow Technologies 36.6 39.3 119.7 112.7 Other (13.1 ) (12.6 ) (40.7 ) (40.2 ) Consolidated $ 121.8 $ 120.2 $ 402.9 $ 368.8 The following table presents a reconciliation of consolidated segment income to consolidated income from continuing operations before income taxes: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Segment income $ 121.8 $ 120.2 $ 402.9 $ 368.8 Restructuring and other (3.5 ) (1.4 ) (34.1 ) (18.9 ) Intangible amortization (8.6 ) (9.2 ) (27.0 ) (27.2 ) Loss on sale of business (0.2 ) (3.8 ) (6.4 ) (3.8 ) Loss of early extinguishment of debt — — (17.1 ) (101.4 ) Corporate allocations — (7.5 ) (11.0 ) (28.9 ) Net interest expense (4.3 ) (13.9 ) (27.9 ) (74.2 ) Other expense (3.4 ) (1.4 ) (5.4 ) (4.1 ) Income from continuing operations before income taxes $ 101.8 $ 83.0 $ 274.0 $ 110.3

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies	Commitments and Contingencies 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 of continuing operations for the nine months ended September 30, 2018 were as follows: In millions September 30, Beginning balance $ 38.1 Service and product warranty provision 43.2 Payments (43.1 ) Foreign currency translation (0.2 ) Ending balance $ 38.0 Stand-by letters of credit, bank guarantees and bonds In certain situations, Tyco International Ltd., Pentair Ltd.’s former parent company (“Tyco”), guaranteed performance by the flow control business of Pentair Ltd. (“Flow Control”) to third parties or provided financial guarantees for financial commitments of Flow Control. 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 September 30, 2018 and December 31, 2017 , the outstanding value of bonds, letters of credit and bank guarantees totaled $124.2 million and $129.2 million , respectively.

Supplemental Guarantor Informat

Supplemental Guarantor Information	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Guarantor Information	Supplemental Guarantor Information Pentair plc (the “Parent Company Guarantor”) and PISG (the “Subsidiary Guarantor”), fully and unconditionally, guarantee the Notes of PFSA (the “Subsidiary Issuer”). The Subsidiary Guarantor is a Switzerland limited liability company and 100 percent -owned subsidiary of the Parent Company Guarantor. The Subsidiary Issuer is a Luxembourg private limited liability company 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), Condensed Consolidating Balance Sheets and Condensed Consolidating Statement of Cash Flows by relevant group within the Company: Pentair plc and PISG as the guarantors, PFSA as issuer of the debt and all other non-guarantor subsidiaries. Condensed consolidating financial information for Pentair plc, PISG and PFSA on a stand-alone basis is presented using the equity method of accounting for subsidiaries. Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended September 30, 2018 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Net sales $ — $ — $ — $ 711.4 $ — $ 711.4 Cost of goods sold — — — 467.6 — 467.6 Gross profit — — — 243.8 — 243.8 Selling, general and administrative 2.3 — 0.2 113.8 — 116.3 Research and development — — — 19.1 — 19.1 Operating (loss) income (2.3 ) — (0.2 ) 110.9 — 108.4 Loss (earnings) from continuing operations of investment in subsidiaries (93.5 ) (93.3 ) (69.5 ) — 256.3 — Other (income) expense: Loss on sale of business — — — 0.2 — 0.2 Net interest (income) expense — (0.2 ) 1.7 2.8 — 4.3 Other expense — — — 2.1 — 2.1 Income (loss) from continuing operations before income taxes 91.2 93.5 67.6 105.8 (256.3 ) 101.8 Provision for income taxes — — — 10.6 — 10.6 Net income (loss) from continuing operations 91.2 93.5 67.6 95.2 (256.3 ) 91.2 Income from discontinued operations, net of tax — — — 18.9 — 18.9 (Loss) earnings from discontinued operations of investment in subsidiaries 18.9 18.9 18.9 — (56.7 ) — Net income (loss) $ 110.1 $ 112.4 $ 86.5 $ 114.1 $ (313.0 ) $ 110.1 Comprehensive income (loss), net of tax Net income (loss) $ 110.1 $ 112.4 $ 86.5 $ 114.1 $ (313.0 ) $ 110.1 Changes in cumulative translation adjustment (2.1 ) (2.1 ) (2.1 ) (2.1 ) 6.3 (2.1 ) Changes in market value of derivative financial instruments, net of tax (1.0 ) (1.0 ) (1.0 ) (1.0 ) 3.0 (1.0 ) Comprehensive income (loss) $ 107.0 $ 109.3 $ 83.4 $ 111.0 $ (303.7 ) $ 107.0 Condensed Consolidating Balance Sheet September 30, 2018 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Assets Current assets Cash and cash equivalents $ 0.1 $ — $ 0.1 $ 64.5 $ — $ 64.7 Accounts and notes receivable, net — — 1.8 400.6 — 402.4 Inventories — — — 387.3 — 387.3 Other current assets 14.3 — 7.1 124.5 (10.7 ) 135.2 Total current assets 14.4 — 9.0 976.9 (10.7 ) 989.6 Property, plant and equipment, net — — — 274.2 — 274.2 Other assets Investments in subsidiaries 1,908.9 1,840.2 2,476.5 — (6,225.6 ) — Goodwill — — — 2,097.0 — 2,097.0 Intangibles, net — — — 289.4 — 289.4 Other non-current assets 23.4 69.1 672.9 726.8 (1,332.9 ) 159.3 Total other assets 1,932.3 1,909.3 3,149.4 3,113.2 (7,558.5 ) 2,545.7 Total assets $ 1,946.7 $ 1,909.3 $ 3,158.4 $ 4,364.3 $ (7,569.2 ) $ 3,809.5 Liabilities and Equity Current liabilities Accounts payable $ 2.0 $ — $ — $ 259.3 $ — $ 261.3 Employee compensation and benefits 0.5 — — 84.5 — 85.0 Other current liabilities 42.1 0.4 4.3 325.0 (10.7 ) 361.1 Total current liabilities 44.6 0.4 4.3 668.8 (10.7 ) 707.4 Other liabilities Long-term debt — — 1,314.1 817.6 (1,332.9 ) 798.8 Pension and other post-retirement compensation and benefits — — — 109.8 — 109.8 Deferred tax liabilities — — — 106.3 — 106.3 Other non-current liabilities 21.9 — — 185.1 — 207.0 Total liabilities 66.5 0.4 1,318.4 1,887.6 (1,343.6 ) 1,929.3 Equity 1,880.2 1,908.9 1,840.0 2,476.7 (6,225.6 ) 1,880.2 Total liabilities and equity $ 1,946.7 $ 1,909.3 $ 3,158.4 $ 4,364.3 $ (7,569.2 ) $ 3,809.5 Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2018 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Operating activities Net cash provided by (used for) operating activities $ 180.9 $ 269.2 $ 274.7 $ 480.5 $ (920.7 ) $ 284.6 Investing activities Capital expenditures — — — (33.8 ) — (33.8 ) Proceeds from sale of property and equipment — — — (0.4 ) — (0.4 ) Payments due to sale of businesses, net — — — (12.8 ) — (12.8 ) Acquisitions, net of cash acquired — — — (0.9 ) — (0.9 ) Net intercompany loan activity — 24.9 (62.0 ) 618.7 (581.6 ) — Net cash provided by (used for) investing activities of continuing operations — 24.9 (62.0 ) 570.8 (581.6 ) (47.9 ) Net cash provided by (used for) investing activities of discontinued operations — — — (7.1 ) — (7.1 ) Net cash provided by (used for) investing activities — 24.9 (62.0 ) 563.7 (581.6 ) (55.0 ) Financing activities Net receipts (repayments) of commercial paper and revolving long-term debt — — 65.0 (19.0 ) — 46.0 Repayments of long-term debt — — (675.1 ) — — (675.1 ) Debt issuance costs — — (2.0 ) — — (2.0 ) Premium paid on early extinguishment of debt — — (16.0 ) — — (16.0 ) Transfer of cash to nVent — — — (74.2 ) — (74.2 ) Distribution from nVent spin-off — — 993.6 — — 993.6 Net change in advances to subsidiaries 359.9 (294.1 ) (563.9 ) (1,004.2 ) 1,502.3 — Shares issued to employees, net of shares withheld 16.0 — — — — 16.0 Repurchases of ordinary shares (400.0 ) — — — — (400.0 ) Dividends paid (156.7 ) — — — — (156.7 ) Net cash provided by (used for) financing activities (180.8 ) (294.1 ) (198.4 ) (1,097.4 ) 1,502.3 (268.4 ) Change in cash held for sale — — — 27.0 — 27.0 Effect of exchange rate changes on cash and cash equivalents — — (14.2 ) 4.4 — (9.8 ) Change in cash and cash equivalents 0.1 — 0.1 (21.8 ) — (21.6 ) Cash and cash equivalents, beginning of period — — — 86.3 — 86.3 Cash and cash equivalents, end of period $ 0.1 $ — $ 0.1 $ 64.5 $ — $ 64.7 Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended September 30, 2017 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Net sales $ — $ — $ — $ 687.6 $ — $ 687.6 Cost of goods sold — — — 451.1 — 451.1 Gross profit — — — 236.5 — 236.5 Selling, general and administrative 4.2 — — 112.6 — 116.8 Research and development — — — 17.9 — 17.9 Operating (loss) income (4.2 ) — — 106.0 — 101.8 (Earnings) loss from continuing operations of investment in subsidiaries (52.7 ) (52.5 ) (37.1 ) — 142.3 — Other (income) expense: Loss on sale of business — — — 3.8 — 3.8 Loss on early extinguishment of debt — — — — — — Net interest expense — (0.2 ) 10.3 3.8 — 13.9 Other expense — — — 1.1 — 1.1 Income (loss) from continuing operations before income taxes 48.5 52.7 26.8 97.3 (142.3 ) 83.0 Provision for income taxes (0.4 ) — — 34.5 — 34.1 Net income (loss) from continuing operations 48.9 52.7 26.8 62.8 (142.3 ) 48.9 Income from discontinued operations, net of tax — — — 78.2 — 78.2 Gain from sale of discontinued operations, net of tax — — — (1.7 ) — (1.7 ) Earnings (loss) from discontinued operations of investment in subsidiaries 76.5 76.5 76.5 — (229.5 ) — Net income (loss) $ 125.4 $ 129.2 $ 103.3 $ 139.3 $ (371.8 ) $ 125.4 Comprehensive income (loss), net of tax Net income (loss) $ 125.4 $ 129.2 $ 103.3 $ 139.3 $ (371.8 ) $ 125.4 Changes in cumulative translation adjustment 34.5 34.5 34.5 34.5 (103.5 ) 34.5 Changes in market value of derivative financial instruments, net of tax (3.0 ) (3.0 ) (3.0 ) (3.0 ) 9.0 (3.0 ) Comprehensive income (loss) $ 156.9 $ 160.7 $ 134.8 $ 170.8 $ (466.3 ) $ 156.9 Condensed Consolidating Balance Sheet December 31, 2017 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Assets Current assets Cash and cash equivalents $ — $ — $ — $ 86.3 $ — $ 86.3 Accounts and notes receivable, net — — — 483.1 — 483.1 Inventories — — — 356.9 — 356.9 Other current assets 10.8 1.8 1.6 109.5 (9.2 ) 114.5 Current assets held for sale — — — 708.0 — 708.0 Total current assets 10.8 1.8 1.6 1,743.8 (9.2 ) 1,748.8 Property, plant and equipment, net — — — 279.8 — 279.8 Other assets Investments in subsidiaries 5,205.1 5,109.6 7,156.1 — (17,470.8 ) — Goodwill — — — 2,112.8 — 2,112.8 Intangibles, net — — — 321.8 — 321.8 Long-term intercompany debt — 94.1 614.0 (708.1 ) — — Other non-current assets 2.2 — — 2,159.4 (1,980.7 ) 180.9 Non-current assets held for sale — — — 3,989.6 — 3,989.6 Total other assets 5,207.3 5,203.7 7,770.1 7,875.5 (19,451.5 ) 6,605.1 Total assets $ 5,218.1 $ 5,205.5 $ 7,771.7 $ 9,899.1 $ (19,460.7 ) $ 8,633.7 Liabilities and Equity Current liabilities Accounts payable $ 1.4 $ — $ — $ 320.1 $ — $ 321.5 Employee compensation and benefits 0.4 — — 115.4 — 115.8 Other current liabilities 99.6 0.4 9.5 301.0 (9.2 ) 401.3 Current liabilities held for sale — — — 360.8 — 360.8 Total current liabilities 101.4 0.4 9.5 1,097.3 (9.2 ) 1,199.4 Other liabilities Long-term debt 48.4 — 2,652.8 720.2 (1,980.7 ) 1,440.7 Pension and other post-retirement compensation and benefits — — — 96.4 — 96.4 Deferred tax liabilities — — — 108.6 — 108.6 Other non-current liabilities 30.5 — — 183.3 — 213.8 Non-current liabilities held for sale — — — 537.0 — 537.0 Total liabilities 180.3 0.4 2,662.3 2,742.8 (1,989.9 ) 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 $ 7,771.7 $ 9,899.1 $ (19,460.7 ) $ 8,633.7 Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2017 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Operating activities Net cash provided by (used for) operating activities $ 356.3 $ 481.8 $ 464.4 $ 660.3 $ (1,601.0 ) $ 361.8 Investing activities Capital expenditures — — — (25.4 ) — (25.4 ) Proceeds from sale of property and equipment — — — 3.2 — 3.2 Proceeds from sale of businesses, net — — 2,765.6 (1.6 ) — 2,764.0 Acquisitions, net of cash acquired — — — (45.9 ) — (45.9 ) Net intercompany loan activity — — 119.4 136.0 (255.4 ) — Net cash provided by (used for) investing activities of continuing operations — — 2,885.0 66.3 (255.4 ) 2,695.9 Net cash provided by (used for) investing activities of discontinued operations — — — (41.3 ) — (41.3 ) Net cash provided by (used for) investing activities — — 2,885.0 25.0 (255.4 ) 2,654.6 Financing activities Net repayments of short-term borrowings — — — (0.8 ) — (0.8 ) Net repayments of commercial paper and revolving long-term debt — — (832.7 ) (9.6 ) — (842.3 ) Repayments 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 (101.6 ) (481.8 ) (579.3 ) (693.7 ) 1,856.4 — Shares issued to employees, net of shares withheld 34.3 — — — — 34.3 Repurchases of ordinary shares (100.0 ) — — — — (100.0 ) Dividends paid (188.9 ) — — — — (188.9 ) Net cash provided by (used for) financing activities (356.2 ) (481.8 ) (3,415.8 ) (804.5 ) 1,856.4 (3,201.9 ) Change in cash held for sale — — — (5.6 ) — (5.6 ) Effect of exchange rate changes on cash and cash equivalents — — 66.7 (11.2 ) — 55.5 Change in cash and cash equivalents 0.1 — 0.3 (136.0 ) — (135.6 ) Cash and cash equivalents, beginning of period — — — 216.9 — 216.9 Cash and cash equivalents, end of period $ 0.1 $ — $ 0.3 $ 80.9 $ — $ 81.3

Basis of Presentation and Res_2

Basis of Presentation and Responsibility for Interim Financial Statements (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The cumulative effect of the changes made to our January 1, 2018 Condensed Consolidated Balance Sheet from the modified retrospective adoption of ASU 2016-16 and ASU 2014-09 was as follows: Condensed Consolidated Balance Sheets In millions Balance at December 31, 2017 Adjustments due to ASU 2016-16 Adjustments due to ASU 2014-09 Balance at January 1, 2018 Assets Accounts and notes receivable, net $ 483.1 $ — $ 2.7 $ 485.8 Inventories 356.9 — (1.6 ) 355.3 Other current assets 114.5 — 1.6 116.1 Current assets held for sale 708.0 — 3.8 711.8 Other non-current assets 180.9 (44.9 ) — 136.0 Non-current assets held for sale 3,989.6 (201.6 ) — 3,788.0 Liabilities Other current liabilities 401.3 — 2.7 404.0 Deferred tax liabilities 108.6 (3.7 ) 0.1 105.0 Non-current liabilities held for sale 537.0 (27.0 ) 0.4 510.4 Equity Retained Earnings 2,481.7 (215.8 ) 1.8 2,267.7

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	Contract assets and liabilities consisted of the following: In millions September 30, December 31, $ Change % Change Contract assets $ 44.8 $ 51.5 $ (6.7 ) (13.0 )% Contract liabilities 25.5 29.1 (3.6 ) (12.4 )% Net contract assets $ 19.3 $ 22.4 $ (3.1 ) (13.8 )%
Disaggregation of Revenue	Geographic net sales information, based on geographic destination of the sale, was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, U.S. $ 438.5 $ 417.4 $ 1,395.1 $ 1,317.8 Western Europe 97.1 92.8 311.2 287.7 Developing (1) 117.6 117.3 346.0 346.0 Other Developed (2) 58.2 60.1 172.3 173.4 Consolidated net sales $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9 (1) Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia. (2) Other Developed includes Australia, Canada and Japan. Vertical market net sales information was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Residential $ 397.6 $ 375.5 $ 1,247.3 $ 1,185.1 Commercial 155.8 148.6 475.4 453.8 Industrial 158.0 163.5 501.9 486.0 Consolidated net sales $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	Operating results of discontinued operations are summarized below: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Net sales $ — $ 540.7 $ 693.9 $ 2,006.3 Cost of goods sold — 321.9 424.0 1,268.9 Gross profit — 218.8 269.9 737.4 Selling, general and administrative 2.5 115.7 233.5 440.6 Research and development — 10.5 14.6 38.1 Operating (loss) income $ (2.5 ) $ 92.6 $ 21.8 $ 258.7 Income from discontinued operations before income taxes $ 14.8 $ 91.8 $ 34.6 $ 257.1 Income tax (benefit) provision (4.1 ) 13.6 7.6 37.3 Income from discontinued operations, net of tax $ 18.9 $ 78.2 $ 27.0 $ 219.8 (Loss) gain from sale of discontinued operations before income taxes $ — $ (1.7 ) $ — $ 201.3 Provision for income taxes — — — 2.4 (Loss) gain from sale of discontinued operations before income taxes $ — $ (1.7 ) $ — $ 198.9 The carrying amounts of major classes of assets and liabilities that were classified as held for sale on the Condensed Consolidated Balance Sheets were as follows: In millions December 31, Cash and cash equivalents $ 27.0 Accounts and notes receivable, net 348.5 Inventories 224.1 Other current assets 108.4 Current assets held for sale $ 708.0 Property, plant and equipment, net $ 265.8 Goodwill 2,238.2 Intangibles, net 1,236.6 Other non-current assets 249.0 Non-current assets held for sale $ 3,989.6 Accounts payable $ 174.1 Employee compensation and benefits 70.8 Other current liabilities 115.9 Current liabilities held for sale $ 360.8 Pension and other post-retirement compensation and benefits $ 189.2 Deferred tax liabilities 286.2 Other non-current liabilities 61.6 Non-current liabilities held for sale $ 537.0

Share Plans (Tables)

Share Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Expense	Total share-based compensation expense for the three and nine months ended September 30, 2018 and 2017 was as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Restricted stock units $ 2.4 $ 2.9 $ 6.7 $ 14.4 Stock options 1.3 1.9 3.5 8.3 Performance share units 1.4 1.4 6.2 9.5 Total share-based compensation expense $ 5.1 $ 6.2 $ 16.4 $ 32.2
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions: 2018 Annual Grant Risk-free interest rate 2.58 % Expected dividend yield 1.56 % Expected share price volatility 24.8 % Expected term (years) 6.1

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring Related Costs	Restructuring related costs included in Selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income included costs for severance and other restructuring costs as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Severance and related costs $ 2.8 $ 1.3 $ 12.8 $ 18.7 Other 0.7 0.1 21.3 0.2 Total restructuring costs $ 3.5 $ 1.4 $ 34.1 $ 18.9
Restructuring Costs By Segment [Table Text Block]	Restructuring costs by reportable segment were as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Aquatic Systems $ 0.6 $ 0.3 $ 3.6 $ 1.9 Filtration Solutions 0.9 0.2 14.4 6.9 Flow Technologies 0.7 0.9 8.7 2.8 Other 1.3 — 7.4 7.3 Consolidated $ 3.5 $ 1.4 $ 34.1 $ 18.9
Restructuring Accrual Activity Recorded on Consolidated Balance Sheets	Activity related to accrued severance and related costs recorded in Other current liabilities in the Condensed Consolidated Balance Sheets is summarized as follows for the nine months ended September 30, 2018 : In millions September 30, Beginning balance $ 34.5 Costs incurred 12.8 Cash payments and other (16.7 ) Ending balance $ 30.6

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Basic and Diluted Earnings Per Share	Basic and diluted earnings per share were calculated as follows: Three months ended Nine months ended In millions, except per-share data September 30, September 30, September 30, September 30, Net income $ 110.1 $ 125.4 $ 254.5 $ 476.9 Net income from continuing operations $ 91.2 $ 48.9 $ 227.5 $ 58.2 Weighted average ordinary shares outstanding Basic 174.3 181.5 176.8 181.7 Dilutive impact of stock options, restricted stock units and performance share units 1.4 2.0 1.7 2.0 Diluted 175.7 183.5 178.5 183.7 Earnings per ordinary share Basic Continuing operations $ 0.52 $ 0.27 $ 1.29 $ 0.32 Discontinued operations 0.11 0.42 0.15 2.30 Basic earnings per ordinary share $ 0.63 $ 0.69 $ 1.44 $ 2.62 Diluted Continuing operations $ 0.52 $ 0.27 $ 1.28 $ 0.32 Discontinued operations 0.11 0.41 0.15 2.28 Diluted earnings per ordinary share $ 0.63 $ 0.68 $ 1.43 $ 2.60 Anti-dilutive stock options excluded from the calculation of diluted earnings per share 1.3 1.6 0.6 1.8

Supplemental Balance Sheet In_2

Supplemental Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information	In millions September 30, December 31, Inventories Raw materials and supplies $ 205.9 $ 190.8 Work-in-process 66.2 57.9 Finished goods 115.2 108.2 Total inventories $ 387.3 $ 356.9 Other current assets Cost in excess of billings $ 44.8 $ 51.5 Prepaid expenses 59.4 51.4 Prepaid income taxes 12.5 7.8 Other current assets 18.5 3.8 Total other current assets $ 135.2 $ 114.5 Property, plant and equipment, net Land and land improvements $ 34.0 $ 33.5 Buildings and leasehold improvements 179.0 184.3 Machinery and equipment 614.2 609.6 Construction in progress 34.8 23.7 Total property, plant and equipment 862.0 851.1 Accumulated depreciation and amortization 587.8 571.3 Total property, plant and equipment, net $ 274.2 $ 279.8 Other non-current assets Prepaid income taxes $ — $ 52.8 Deferred income taxes 29.6 29.0 Deferred compensation plan assets 27.5 23.2 Other non-current assets 102.2 75.9 Total other non-current assets $ 159.3 $ 180.9 Other current liabilities Dividends payable $ 30.4 $ 63.1 Accrued warranty 38.0 38.1 Accrued rebates 65.9 49.8 Billings in excess of cost 15.9 20.1 Income taxes payable 24.3 39.7 Accrued restructuring 30.6 34.5 Other current liabilities 156.0 156.0 Total other current liabilities $ 361.1 $ 401.3 Other non-current liabilities Income taxes payable $ 51.0 $ 61.3 Self-insurance liabilities 59.4 48.3 Deferred compensation plan liabilities 27.5 23.2 Foreign currency contract liabilities 45.5 47.2 Other non-current liabilities 23.6 33.8 Total other non-current liabilities $ 207.0 $ 213.8

Goodwill and Other Identifiab_2

Goodwill and Other Identifiable Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by reportable segment were as follows: In millions December 31, Foreign currency translation/other September 30, Aquatic Systems $ 973.1 $ (6.0 ) $ 967.1 Filtration Solutions 472.1 (7.9 ) 464.2 Flow Technologies 667.6 (1.9 ) 665.7 Total goodwill $ 2,112.8 $ (15.8 ) $ 2,097.0
Detail of Identifiable Intangible Assets	Identifiable intangible assets consisted of the following: September 30, December 31, In millions Cost Accumulated amortization Net Cost Accumulated amortization Net Definite-life intangibles Customer relationships $ 353.3 $ (245.5 ) $ 107.8 $ 360.9 $ (229.9 ) $ 131.0 Trade names 0.4 (0.4 ) — 1.5 (1.4 ) 0.1 Proprietary technology and patents 88.0 (68.2 ) 19.8 117.0 (89.3 ) 27.7 Total definite-life intangibles 441.7 (314.1 ) 127.6 479.4 (320.6 ) 158.8 Indefinite-life intangibles Trade names 161.8 — 161.8 163.0 — 163.0 Total intangibles $ 603.5 $ (314.1 ) $ 289.4 $ 642.4 $ (320.6 ) $ 321.8
Estimated Future Amortization Expense for Identifiable Intangible Assets	Estimated future amortization expense for identifiable intangible assets during the remainder of 2018 and the next five years is as follows: Q4 In millions 2018 2019 2020 2021 2022 2023 Estimated amortization expense $ 8.3 $ 28.0 $ 22.9 $ 17.6 $ 10.3 $ 7.9

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2018
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 interest rate as of September 30, 2018 Maturity Year September 30, December 31, Commercial paper 2.934% 2023 $ 99.0 $ 34.0 Revolving credit facilities 3.461% 2023 9.4 28.4 Senior notes - fixed rate (1) 2.900% 2018 — 255.3 Senior notes - fixed rate (1) 2.650% 2019 250.0 250.0 Senior notes - fixed rate - Euro (1) 2.450% 2019 160.4 594.4 Senior notes - fixed rate (1) 3.625% 2020 74.0 74.0 Senior notes - fixed rate (1) 5.000% 2021 103.8 103.8 Senior notes - fixed rate (1) 3.150% 2022 88.3 88.3 Senior notes - fixed rate (1) 4.650% 2025 19.3 19.3 Other N/A N/A 0.1 — Unamortized debt issuance costs and discounts N/A N/A (5.5 ) (6.8 ) Total debt $ 798.8 $ 1,440.7 (1) Senior notes are guaranteed as to payment by Pentair and PISG
Debt Outstanding Matures on Calendar Year Basis	Debt outstanding, excluding unamortized issuance costs and discounts, at September 30, 2018 matures on a calendar year basis as follows: Q4 In millions 2018 2019 2020 2021 2022 2023 Thereafter Total Contractual debt obligation maturities $ — $ 410.5 $ 74.0 $ 103.8 $ 88.3 $ 108.4 $ 19.3 $ 804.3

Derivatives and Financial Ins_2

Derivatives and Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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: September 30, 2018 In millions Level 1 Level 2 Level 3 Total Recurring fair value measurements Foreign currency contract liabilities $ — $ (45.5 ) $ — $ (45.5 ) Deferred compensation plan assets 24.3 3.2 — 27.5 Total recurring fair value measurements $ 24.3 $ (42.3 ) $ — $ (18.0 ) December 31, 2017 In millions Level 1 Level 2 Level 3 Total Recurring fair value measurements Foreign currency contract assets $ — $ 0.6 $ — $ 0.6 Foreign currency contract liabilities — (47.2 ) — (47.2 ) Deferred compensation plan assets 18.7 4.5 — 23.2 Total recurring fair value measurements $ 18.7 $ (42.1 ) $ — $ (23.4 ) 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 $8.8 million for a trade name intangible in 2017. The impairment charge reduced the carrying value of the impacted trade name intangible to $10.8 million . 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.
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, were as follows: September 30, December 31, In millions Recorded Amount Fair Value Recorded Amount Fair Value Variable rate debt $ 108.5 $ 108.5 $ 62.4 $ 62.4 Fixed rate debt 695.8 698.7 1,385.1 1,424.0 Total debt $ 804.3 $ 807.2 $ 1,447.5 $ 1,486.4

Benefit Plans (Tables)

Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Service cost $ 1.0 $ 2.9 $ 3.1 $ 8.8 Interest cost 3.0 4.1 9.0 12.3 Expected return on plan assets (2.2 ) (2.9 ) (6.7 ) (8.7 ) Actuarial loss 2.2 — 2.2 — Net periodic benefit cost $ 4.0 $ 4.1 $ 7.6 $ 12.4

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Financial Information by Reportable Segment	Financial information by reportable segment is as follows: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Net sales Aquatic Systems $ 232.7 $ 211.8 $ 749.3 $ 688.0 Filtration Solutions 240.4 242.4 754.1 737.0 Flow Technologies 238.0 233.0 720.2 698.8 Other 0.3 0.4 1.0 1.1 Consolidated $ 711.4 $ 687.6 $ 2,224.6 $ 2,124.9 Segment income (loss) Aquatic Systems $ 59.9 $ 53.1 $ 199.5 $ 182.9 Filtration Solutions 38.4 40.4 124.4 113.4 Flow Technologies 36.6 39.3 119.7 112.7 Other (13.1 ) (12.6 ) (40.7 ) (40.2 ) Consolidated $ 121.8 $ 120.2 $ 402.9 $ 368.8
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	The following table presents a reconciliation of consolidated segment income to consolidated income from continuing operations before income taxes: Three months ended Nine months ended In millions September 30, September 30, September 30, September 30, Segment income $ 121.8 $ 120.2 $ 402.9 $ 368.8 Restructuring and other (3.5 ) (1.4 ) (34.1 ) (18.9 ) Intangible amortization (8.6 ) (9.2 ) (27.0 ) (27.2 ) Loss on sale of business (0.2 ) (3.8 ) (6.4 ) (3.8 ) Loss of early extinguishment of debt — — (17.1 ) (101.4 ) Corporate allocations — (7.5 ) (11.0 ) (28.9 ) Net interest expense (4.3 ) (13.9 ) (27.9 ) (74.2 ) Other expense (3.4 ) (1.4 ) (5.4 ) (4.1 ) Income from continuing operations before income taxes $ 101.8 $ 83.0 $ 274.0 $ 110.3

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Changes in Carrying Amount of Service and Product Warranties	The changes in the carrying amount of service and product warranties of continuing operations for the nine months ended September 30, 2018 were as follows: In millions September 30, Beginning balance $ 38.1 Service and product warranty provision 43.2 Payments (43.1 ) Foreign currency translation (0.2 ) Ending balance $ 38.0

Supplemental Guarantor Inform_2

Supplemental Guarantor Information (Tables)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)	Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended September 30, 2018 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Net sales $ — $ — $ — $ 711.4 $ — $ 711.4 Cost of goods sold — — — 467.6 — 467.6 Gross profit — — — 243.8 — 243.8 Selling, general and administrative 2.3 — 0.2 113.8 — 116.3 Research and development — — — 19.1 — 19.1 Operating (loss) income (2.3 ) — (0.2 ) 110.9 — 108.4 Loss (earnings) from continuing operations of investment in subsidiaries (93.5 ) (93.3 ) (69.5 ) — 256.3 — Other (income) expense: Loss on sale of business — — — 0.2 — 0.2 Net interest (income) expense — (0.2 ) 1.7 2.8 — 4.3 Other expense — — — 2.1 — 2.1 Income (loss) from continuing operations before income taxes 91.2 93.5 67.6 105.8 (256.3 ) 101.8 Provision for income taxes — — — 10.6 — 10.6 Net income (loss) from continuing operations 91.2 93.5 67.6 95.2 (256.3 ) 91.2 Income from discontinued operations, net of tax — — — 18.9 — 18.9 (Loss) earnings from discontinued operations of investment in subsidiaries 18.9 18.9 18.9 — (56.7 ) — Net income (loss) $ 110.1 $ 112.4 $ 86.5 $ 114.1 $ (313.0 ) $ 110.1 Comprehensive income (loss), net of tax Net income (loss) $ 110.1 $ 112.4 $ 86.5 $ 114.1 $ (313.0 ) $ 110.1 Changes in cumulative translation adjustment (2.1 ) (2.1 ) (2.1 ) (2.1 ) 6.3 (2.1 ) Changes in market value of derivative financial instruments, net of tax (1.0 ) (1.0 ) (1.0 ) (1.0 ) 3.0 (1.0 ) Comprehensive income (loss) $ 107.0 $ 109.3 $ 83.4 $ 111.0 $ (303.7 ) $ 107.0 Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended September 30, 2017 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Net sales $ — $ — $ — $ 687.6 $ — $ 687.6 Cost of goods sold — — — 451.1 — 451.1 Gross profit — — — 236.5 — 236.5 Selling, general and administrative 4.2 — — 112.6 — 116.8 Research and development — — — 17.9 — 17.9 Operating (loss) income (4.2 ) — — 106.0 — 101.8 (Earnings) loss from continuing operations of investment in subsidiaries (52.7 ) (52.5 ) (37.1 ) — 142.3 — Other (income) expense: Loss on sale of business — — — 3.8 — 3.8 Loss on early extinguishment of debt — — — — — — Net interest expense — (0.2 ) 10.3 3.8 — 13.9 Other expense — — — 1.1 — 1.1 Income (loss) from continuing operations before income taxes 48.5 52.7 26.8 97.3 (142.3 ) 83.0 Provision for income taxes (0.4 ) — — 34.5 — 34.1 Net income (loss) from continuing operations 48.9 52.7 26.8 62.8 (142.3 ) 48.9 Income from discontinued operations, net of tax — — — 78.2 — 78.2 Gain from sale of discontinued operations, net of tax — — — (1.7 ) — (1.7 ) Earnings (loss) from discontinued operations of investment in subsidiaries 76.5 76.5 76.5 — (229.5 ) — Net income (loss) $ 125.4 $ 129.2 $ 103.3 $ 139.3 $ (371.8 ) $ 125.4 Comprehensive income (loss), net of tax Net income (loss) $ 125.4 $ 129.2 $ 103.3 $ 139.3 $ (371.8 ) $ 125.4 Changes in cumulative translation adjustment 34.5 34.5 34.5 34.5 (103.5 ) 34.5 Changes in market value of derivative financial instruments, net of tax (3.0 ) (3.0 ) (3.0 ) (3.0 ) 9.0 (3.0 ) Comprehensive income (loss) $ 156.9 $ 160.7 $ 134.8 $ 170.8 $ (466.3 ) $ 156.9
Schedule of Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet September 30, 2018 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Assets Current assets Cash and cash equivalents $ 0.1 $ — $ 0.1 $ 64.5 $ — $ 64.7 Accounts and notes receivable, net — — 1.8 400.6 — 402.4 Inventories — — — 387.3 — 387.3 Other current assets 14.3 — 7.1 124.5 (10.7 ) 135.2 Total current assets 14.4 — 9.0 976.9 (10.7 ) 989.6 Property, plant and equipment, net — — — 274.2 — 274.2 Other assets Investments in subsidiaries 1,908.9 1,840.2 2,476.5 — (6,225.6 ) — Goodwill — — — 2,097.0 — 2,097.0 Intangibles, net — — — 289.4 — 289.4 Other non-current assets 23.4 69.1 672.9 726.8 (1,332.9 ) 159.3 Total other assets 1,932.3 1,909.3 3,149.4 3,113.2 (7,558.5 ) 2,545.7 Total assets $ 1,946.7 $ 1,909.3 $ 3,158.4 $ 4,364.3 $ (7,569.2 ) $ 3,809.5 Liabilities and Equity Current liabilities Accounts payable $ 2.0 $ — $ — $ 259.3 $ — $ 261.3 Employee compensation and benefits 0.5 — — 84.5 — 85.0 Other current liabilities 42.1 0.4 4.3 325.0 (10.7 ) 361.1 Total current liabilities 44.6 0.4 4.3 668.8 (10.7 ) 707.4 Other liabilities Long-term debt — — 1,314.1 817.6 (1,332.9 ) 798.8 Pension and other post-retirement compensation and benefits — — — 109.8 — 109.8 Deferred tax liabilities — — — 106.3 — 106.3 Other non-current liabilities 21.9 — — 185.1 — 207.0 Total liabilities 66.5 0.4 1,318.4 1,887.6 (1,343.6 ) 1,929.3 Equity 1,880.2 1,908.9 1,840.0 2,476.7 (6,225.6 ) 1,880.2 Total liabilities and equity $ 1,946.7 $ 1,909.3 $ 3,158.4 $ 4,364.3 $ (7,569.2 ) $ 3,809.5 Condensed Consolidating Balance Sheet December 31, 2017 In millions Parent Company Guarantor Subsidiary Subsidiary Issuer Non-guarantor Subsidiaries Eliminations Consolidated Assets Current assets Cash and cash equivalents $ — $ — $ — $ 86.3 $ — $ 86.3 Accounts and notes receivable, net — — — 483.1 — 483.1 Inventories — — — 356.9 — 356.9 Other current assets 10.8 1.8 1.6 109.5 (9.2 ) 114.5 Current assets held for sale — — — 708.0 — 708.0 Total current assets 10.8 1.8 1.6 1,743.8 (9.2 ) 1,748.8 Property, plant and equipment, net — — — 279.8 — 279.8 Other assets Investments in subsidiaries 5,205.1 5,109.6 7,156.1 — (17,470.8 ) — Goodwill — — — 2,112.8 — 2,112.8 Intangibles, net — — — 321.8 — 321.8 Long-term intercompany debt — 94.1 614.0 (708.1 ) — — Other non-current assets 2.2 — — 2,159.4 (1,980.7 ) 180.9 Non-current assets held for sale — — — 3,989.6 — 3,989.6 Total other assets 5,207.3 5,203.7 7,770.1 7,875.5 (19,451.5 ) 6,605.1 Total assets $ 5,218.1 $ 5,205.5 $ 7,771.7 $ 9,899.1 $ (19,460.7 ) $ 8,633.7 Liabilities and Equity Current liabilities Accounts payable $ 1.4 $ — $ — $ 320.1 $ — $ 321.5 Employee compensation and benefits 0.4 — — 115.4 — 115.8 Other current liabilities 99.6 0.4 9.5 301.0 (9.2 ) 401.3 Current liabilities held for sale — — — 360.8 — 360.8 Total current liabilities 101.4 0.4 9.5 1,097.3 (9.2 ) 1,199.4 Other liabilities Long-term debt 48.4 — 2,652.8 720.2 (1,980.7 ) 1,440.7 Pension and other post-retirement compensation and benefits — — — 96.4 — 96.4 Deferred tax liabilities — — — 108.6 — 108.6 Other non-current liabilities 30.5 — — 183.3 — 213.8 Non-current liabilities held for sale — — — 537.0 — 537.0 Total liabilities 180.3 0.4 2,662.3 2,742.8 (1,989.9 ) 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 $ 7,771.7 $ 9,899.1 $ (19,460.7 ) $ 8,633.7
Schedule of Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2018 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Operating activities Net cash provided by (used for) operating activities $ 180.9 $ 269.2 $ 274.7 $ 480.5 $ (920.7 ) $ 284.6 Investing activities Capital expenditures — — — (33.8 ) — (33.8 ) Proceeds from sale of property and equipment — — — (0.4 ) — (0.4 ) Payments due to sale of businesses, net — — — (12.8 ) — (12.8 ) Acquisitions, net of cash acquired — — — (0.9 ) — (0.9 ) Net intercompany loan activity — 24.9 (62.0 ) 618.7 (581.6 ) — Net cash provided by (used for) investing activities of continuing operations — 24.9 (62.0 ) 570.8 (581.6 ) (47.9 ) Net cash provided by (used for) investing activities of discontinued operations — — — (7.1 ) — (7.1 ) Net cash provided by (used for) investing activities — 24.9 (62.0 ) 563.7 (581.6 ) (55.0 ) Financing activities Net receipts (repayments) of commercial paper and revolving long-term debt — — 65.0 (19.0 ) — 46.0 Repayments of long-term debt — — (675.1 ) — — (675.1 ) Debt issuance costs — — (2.0 ) — — (2.0 ) Premium paid on early extinguishment of debt — — (16.0 ) — — (16.0 ) Transfer of cash to nVent — — — (74.2 ) — (74.2 ) Distribution from nVent spin-off — — 993.6 — — 993.6 Net change in advances to subsidiaries 359.9 (294.1 ) (563.9 ) (1,004.2 ) 1,502.3 — Shares issued to employees, net of shares withheld 16.0 — — — — 16.0 Repurchases of ordinary shares (400.0 ) — — — — (400.0 ) Dividends paid (156.7 ) — — — — (156.7 ) Net cash provided by (used for) financing activities (180.8 ) (294.1 ) (198.4 ) (1,097.4 ) 1,502.3 (268.4 ) Change in cash held for sale — — — 27.0 — 27.0 Effect of exchange rate changes on cash and cash equivalents — — (14.2 ) 4.4 — (9.8 ) Change in cash and cash equivalents 0.1 — 0.1 (21.8 ) — (21.6 ) Cash and cash equivalents, beginning of period — — — 86.3 — 86.3 Cash and cash equivalents, end of period $ 0.1 $ — $ 0.1 $ 64.5 $ — $ 64.7 Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2017 In millions Parent Subsidiary Subsidiary Non-guarantor Eliminations Consolidated Operating activities Net cash provided by (used for) operating activities $ 356.3 $ 481.8 $ 464.4 $ 660.3 $ (1,601.0 ) $ 361.8 Investing activities Capital expenditures — — — (25.4 ) — (25.4 ) Proceeds from sale of property and equipment — — — 3.2 — 3.2 Proceeds from sale of businesses, net — — 2,765.6 (1.6 ) — 2,764.0 Acquisitions, net of cash acquired — — — (45.9 ) — (45.9 ) Net intercompany loan activity — — 119.4 136.0 (255.4 ) — Net cash provided by (used for) investing activities of continuing operations — — 2,885.0 66.3 (255.4 ) 2,695.9 Net cash provided by (used for) investing activities of discontinued operations — — — (41.3 ) — (41.3 ) Net cash provided by (used for) investing activities — — 2,885.0 25.0 (255.4 ) 2,654.6 Financing activities Net repayments of short-term borrowings — — — (0.8 ) — (0.8 ) Net repayments of commercial paper and revolving long-term debt — — (832.7 ) (9.6 ) — (842.3 ) Repayments 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 (101.6 ) (481.8 ) (579.3 ) (693.7 ) 1,856.4 — Shares issued to employees, net of shares withheld 34.3 — — — — 34.3 Repurchases of ordinary shares (100.0 ) — — — — (100.0 ) Dividends paid (188.9 ) — — — — (188.9 ) Net cash provided by (used for) financing activities (356.2 ) (481.8 ) (3,415.8 ) (804.5 ) 1,856.4 (3,201.9 ) Change in cash held for sale — — — (5.6 ) — (5.6 ) Effect of exchange rate changes on cash and cash equivalents — — 66.7 (11.2 ) — 55.5 Change in cash and cash equivalents 0.1 — 0.3 (136.0 ) — (135.6 ) Cash and cash equivalents, beginning of period — — — 216.9 — 216.9 Cash and cash equivalents, end of period $ 0.1 $ — $ 0.3 $ 80.9 $ — $ 81.3

Basis of Presentation and Res_3

Basis of Presentation and Responsibility for Interim Financial Statements - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit cost		$ 4	$ 4.1	$ 7.6	$ 12.4
Reclassification from AOCI to retained earnings	$ 215.8
Reduction in prepaid long-term asset	254.3
Deferred tax asset, income tax expense	38.5
nVent
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI to retained earnings	$ 174.6
Effect of Change | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit cost			$ 1.4		$ 4.1

Basis of Presentation and Res_4

Basis of Presentation and Responsibility for Interim Financial Statements - Schedule of Impact of ASC 606 on the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts and notes receivable, net	$ 402.4	$ 485.8	$ 483.1
Inventories	387.3	355.3	356.9
Other current assets	135.2	116.1	114.5
Current assets held for sale	0	711.8	708
Other non-current assets	159.3	136	180.9
Non-current assets held for sale	0	3,788	3,989.6
Liabilities
Other current liabilities	361.1	404	401.3
Deferred tax liabilities	106.3	105	108.6
Non-current liabilities held for sale	0	510.4	537
Equity
Retained earnings	$ 107.5	2,267.7	2,481.7
Accounting Standards Update 2016-16
Assets
Accounts and notes receivable, net		0
Inventories		0
Other current assets		0
Current assets held for sale		0
Other non-current assets		(44.9)
Non-current assets held for sale		(201.6)
Liabilities
Other current liabilities		0
Deferred tax liabilities		(3.7)
Non-current liabilities held for sale		(27)
Equity
Retained earnings		(215.8)
Balances without adoption of ASC 606
Assets
Accounts and notes receivable, net			483.1
Inventories			356.9
Other current assets			114.5
Other non-current assets			180.9
Liabilities
Other current liabilities			401.3
Deferred tax liabilities			108.6
Equity
Retained earnings			$ 2,481.7
Effect of Change | Accounting Standards Update 2014-09
Assets
Accounts and notes receivable, net		2.7
Inventories		(1.6)
Other current assets		1.6
Current assets held for sale		3.8
Other non-current assets		0
Non-current assets held for sale		0
Liabilities
Other current liabilities		2.7
Deferred tax liabilities		0.1
Non-current liabilities held for sale		0.4
Equity
Retained earnings		$ 1.8

Revenue - Schedule of Contract

Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract assets	$ 44.8	$ 51.5
Contract liabilities	25.5	29.1
Net contract assets	19.3	$ 22.4
$ Change
Contract assets	(6.7)
Contract liabilities	(3.6)
Net contract assets	$ (3.1)
% Change
Contract assets	(12.40%)
Contract liabilities	(13.00%)
Net contract assets	(13.80%)

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Percent of contract liabilities			65.00%
Change in net contract assets			$ (3,100,000)
Impairment losses on contract assets			$ 0
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues, percent	90.50%	91.30%	92.30%	92.80%
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues, percent	9.50%	8.70%	7.70%	7.20%

Revenue - Performance Obligatio

Revenue - Performance Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Transferred at Point in Time
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues, percent	90.50%	91.30%	92.30%	92.80%
Transferred over Time
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues, percent	9.50%	8.70%	7.70%	7.20%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 69.1		$ 69.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01 | Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01 | Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation period	18 months		18 months

Revenue - Geographic Net Sales

Revenue - Geographic Net Sales Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 711.4	$ 687.6	$ 2,224.6	$ 2,124.9
Residential
Disaggregation of Revenue [Line Items]
Net sales	397.6	375.5	1,247.3	1,185.1
Commercial
Disaggregation of Revenue [Line Items]
Net sales	155.8	148.6	475.4	453.8
Industrial
Disaggregation of Revenue [Line Items]
Net sales	158	163.5	501.9	486
U.S.
Disaggregation of Revenue [Line Items]
Net sales	438.5	417.4	1,395.1	1,317.8
Western Europe
Disaggregation of Revenue [Line Items]
Net sales	97.1	92.8	311.2	287.7
Developing
Disaggregation of Revenue [Line Items]
Net sales	117.6	117.3	346	346
Other Developed
Disaggregation of Revenue [Line Items]
Net sales	$ 58.2	$ 60.1	$ 172.3	$ 173.4

Discontinued Operations Additio

Discontinued Operations Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of cash from nVent	$ 993.6			$ 993.6	$ 0
Gain from sale of discontinued operations, net of tax		$ 0	$ (1.7)	0	198.9	$ (181.1)
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of cash from nVent						$ 3,150
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation costs		$ 2.5	11.7	$ 82.4	19.3
Deal related costs and expenses			$ 1.7		$ 55.4

Discontinued Operations Income

Discontinued Operations Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0	$ 540.7	$ 693.9	$ 2,006.3
Cost of goods sold	0	321.9	424	1,268.9
Gross profit	0	218.8	269.9	737.4
Selling, general and administrative	2.5	115.7	233.5	440.6
Research and development	0	10.5	14.6	38.1
Operating (loss) income	(2.5)	92.6	21.8	258.7
Income from discontinued operations before income taxes	14.8	91.8	34.6	257.1
Income tax (benefit) provision	(4.1)	13.6	7.6	37.3
Income from discontinued operations, net of tax	18.9	78.2	27	219.8
(Loss) gain from sale of discontinued operations before income taxes	0	(1.7)	0	201.3
Provision for income taxes	0	0	0	2.4
Gain from sale of discontinued operations, net of tax	$ 0	$ 1.7	$ 0	$ (198.9)	$ 181.1

Discontinued Operations Balance

Discontinued Operations Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents			$ 27
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net			348.5
Disposal Group, Including Discontinued Operation, Inventory			224.1
Disposal Group, Including Discontinued Operation, Other Assets, Current			108.4
Current assets held for sale	$ 0	$ 711.8	708
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment			265.8
Disposal Group, Including Discontinued Operation, Goodwill			2,238.2
Disposal Group, Including Discontinued Operation, Intangible Assets			1,236.6
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent			249
Non-current assets held for sale	0	3,788	3,989.6
Disposal Group, Including Discontinued Operation, Accounts Payable, Current			174.1
Disposal Group, Including Discontinued Operation, Employee Compensation and Benefits			70.8
Disposal Group, Including Discontinued Operation, Other Liabilities, Current			115.9
Current liabilities held for sale	0		360.8
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation			189.2
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent			286.2
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent			61.6
Non-current liabilities held for sale	$ 0	$ 510.4	$ 537

Share Plans - Schedule of Share

Share Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 5.1	$ 6.2	$ 16.4	$ 32.2
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	2.4	2.9	6.7	14.4
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	1.3	1.9	3.5	8.3
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 1.4	$ 1.4	$ 6.2	$ 9.5

Share Plans - Schedule of Valua

Share Plans - Schedule of Valuation Assumptions (Details)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	2.58%
Expected dividend yield	1.56%
Expected share price volatility	24.80%
Expected term (years)	6 years 1 month

Share Plans - Additional Inform

Share Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	May 09, 2018	May 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation associated with discontinued operations			$ 0	$ 1.7	$ 3.4	$ 6
Vesting period					3 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Spinoff transaction, equity interests issued per ordinary predecessor share (in shares)	1
Performance share units | 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion rate of target	125.00%
Performance share units | 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion rate of target	100.00%
2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)		800,000
2012 Stock Incentive Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		200,000
Weighted-average grant date fair value (in dollars per share)		$ 45.42
2012 Stock Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		500,000
Weighted-average grant date fair value of options (in dollars per share)		$ 10.92
2012 Stock Incentive Plan | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		100,000
Weighted-average grant date fair value (in dollars per share)		$ 45.42

Restructuring - Additional Inf

Restructuring - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Person	Sep. 30, 2017USD ($)	Dec. 31, 2017Person
Restructuring Cost and Reserve [Line Items]
Number of employees | Person			300		250
Total restructuring costs	$ 3.5	$ 1.4	$ 34.1	$ 18.9
Aquatic Systems
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	0.6	0.3	3.6	1.9
Filtration Solutions
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	0.9	0.2	14.4	6.9
Flow Technologies
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	0.7	0.9	8.7	2.8
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 1.3	$ 0	$ 7.4	$ 7.3

Restructuring - Costs Included

Restructuring - Costs Included in Selling, General & Administrative Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 3.5	$ 1.4	$ 34.1	$ 18.9
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2.8	1.3	12.8	18.7
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.7	$ 0.1	$ 21.3	$ 0.2

Restructuring - Accrual Activit

Restructuring - Accrual Activity (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 34.5
Costs incurred	12.8
Cash payments and other	(16.7)
Ending balance	$ 30.6

Earnings Per Share - Basic and

Earnings Per Share - Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 110.1	$ 125.4	$ 254.5	$ 476.9
Net income from continuing operations	$ 91.2	$ 48.9	$ 227.5	$ 58.2
Weighted average common shares outstanding
Basic (shares)	174.3	181.5	176.8	181.7
Dilutive impact of stock options, restricted stock units and performance share units	1.4	2	1.7	2
Diluted (shares)	175.7	183.5	178.5	183.7
Earnings (loss) Per Share, Basic
Continuing operations (in dollars per share)	$ 0.52	$ 0.27	$ 1.29	$ 0.32
Discontinued operations (in dollars per share)	0.11	0.42	0.15	2.30
Basic earnings (loss) per ordinary share (in dollars per share)	0.63	0.69	1.44	2.62
Earnings (loss) Per Share, Diluted
Continuing operations (in dollars per share)	0.52	0.27	1.28	0.32
Discontinued operations (in dollars per share)	0.11	0.41	0.15	2.28
Diluted earnings (loss) per ordinary share (in dollars per share)	$ 0.63	$ 0.68	$ 1.43	$ 2.60
Anti-dilutive stock options excluded from the calculation of diluted earnings per share	1.3	1.6	0.6	1.8

Supplemental Balance Sheet In_3

Supplemental Balance Sheet Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventories
Raw materials and supplies	$ 205.9		$ 190.8
Work-in-process	66.2		57.9
Finished goods	115.2		108.2
Total inventories	387.3	$ 355.3	356.9
Other current assets
Cost in excess of billings	44.8		51.5
Prepaid expenses	59.4		51.4
Prepaid income taxes	12.5		7.8
Other current assets	18.5		3.8
Total other current assets	135.2	116.1	114.5
Property, plant and equipment, net
Land and land improvements	34		33.5
Buildings and leasehold improvements	179		184.3
Machinery and equipment	614.2		609.6
Construction in progress	34.8		23.7
Total property, plant and equipment	862		851.1
Accumulated depreciation and amortization	587.8		571.3
Total property, plant and equipment, net	274.2		279.8
Other non-current assets
Prepaid income taxes	0		52.8
Prepaid income taxes	29.6		29
Deferred compensation plan assets	27.5		23.2
Other non-current assets	102.2		75.9
Total other non-current assets	159.3	136	180.9
Other current liabilities
Dividends payable	30.4		63.1
Accrued warranty	38		38.1
Accrued rebates	65.9		49.8
Billings in excess of cost	15.9		20.1
Income taxes payable	24.3		39.7
Accrued restructuring	30.6		34.5
Other current liabilities	156		156
Total other current liabilities	361.1	$ 404	401.3
Other non-current liabilities
Income taxes payable	51		61.3
Self-insurance liabilities	59.4		48.3
Deferred compensation plan liabilities	27.5		23.2
Foreign currency contract liabilities	45.5		47.2
Other non-current liabilities	23.6		33.8
Total other non-current liabilities	$ 207		$ 213.8

Goodwill and Other Identifiab_3

Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 2,112.8
Foreign currency translation/other	(15.8)
Ending Balance	2,097
Aquatic Systems
Goodwill [Roll Forward]
Beginning Balance	973.1
Foreign currency translation/other	(6)
Ending Balance	967.1
Filtration Solutions
Goodwill [Roll Forward]
Beginning Balance	472.1
Foreign currency translation/other	(7.9)
Ending Balance	464.2
Flow Technologies
Goodwill [Roll Forward]
Beginning Balance	667.6
Foreign currency translation/other	(1.9)
Ending Balance	$ 665.7

Goodwill and Other Identifiab_4

Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 441.7	$ 479.4
Accumulated amortization	(314.1)	(320.6)
Net	127.6	158.8
Net, indefinite-life intangibles	161.8	163
Cost	603.5	642.4
Net	289.4	321.8
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	353.3	360.9
Accumulated amortization	(245.5)	(229.9)
Net	107.8	131
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Cost	0.4	1.5
Accumulated amortization	(0.4)	(1.4)
Net	0	0.1
Patented Technology [Member]
Acquired Intangible Assets By Major Class [Line Items]
Cost	88	117
Accumulated amortization	(68.2)	(89.3)
Net	$ 19.8	$ 27.7

Goodwill and Other Identifiab_5

Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization expense	$ 8.6	$ 9.2	$ 27	$ 27.2

Goodwill and Other Identifiab_6

Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail) $ in Millions	Sep. 30, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Q3 - Q4 2018	$ 8.3
2,019	28
2,020	22.9
2,021	17.6
2,022	10.3
2,023	$ 7.9

Debt - Debt and Average Interes

Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts	$ (5.5)	$ (6.8)
Total debt	798.8	1,440.7
Long-term debt	$ 798.8	1,440.7
Commercial Paper
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	2.934%
Commercial paper	$ 99	34
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	3.461%
Total debt	$ 9.4	28.4
Senior Notes | Senior Notes 2.900% Due 2018
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	2.90%
Total debt	$ 0	255.3
Senior Notes | Senior Notes 2.650% Due 2019
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	2.65%
Total debt	$ 250	250
Senior Notes | Senior Notes 2.45% Due 2019
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	2.45%
Total debt	$ 160.4	594.4
Senior Notes | Senior Notes 3.625% Due 2020
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	3.625%
Total debt	$ 74	74
Senior Notes | Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	5.00%
Total debt	$ 103.8	103.8
Senior Notes | Senior Notes 3.150% Due 2022
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	3.15%
Total debt	$ 88.3	88.3
Senior Notes | Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Average interest rate as of September 30, 2018	4.65%
Total debt	$ 19.3	19.3
Other
Debt Instrument [Line Items]
Total debt	$ 0.1	$ 0

Debt - Additional Information (

Debt - Additional Information (Detail) € in Millions	Apr. 25, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018EUR (€)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2015
Debt Instrument [Line Items]
Distribution of cash from nVent		$ 993,600,000		$ 993,600,000	$ 0
Leverage ratio covenant period				12 months
Debt				$ 798,800,000		$ 1,440,700,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	5 years
Credit facility maximum borrowing capacity	$ 800,000,000
Optional line of credit limit increase	$ 300,000,000
Remaining borrowing capacity				691,600,000
Debt				9,400,000		28,400,000
Line of Credit | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash				$ 250,000,000
Debt agreement financial covenant, leverage ratio				1
EBITDA ratio for debt				3
Line of Credit | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash				$ 5,000,000
Debt agreement financial covenant, leverage ratio				3.75
EBITDA ratio for debt				1
Commercial Paper
Debt Instrument [Line Items]
Commercial paper				$ 99,000,000		34,000,000
Senior Notes | Senior Notes 2.900% Due 2018
Debt Instrument [Line Items]
Debt				$ 0		255,300,000
Interest rate				2.90%
Senior Notes | Senior Notes 2.45% Due 2019
Debt Instrument [Line Items]
Debt				$ 160,400,000		$ 594,400,000
Cash tender offer | €			€ 363.4
Interest rate				2.45%			2.45%
Premium paid		16,000,000
Write off of deferred debt issuance cost		$ 1,100,000
Other Credit Facilities [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 21,100,000
Borrowings outstanding				$ 0

Debt - Debt Outstanding Matures

Debt - Debt Outstanding Matures on Calendar Year Basis (Detail) $ in Millions	Sep. 30, 2018USD ($)
Debt Instrument [Line Items]
Q4 2018	$ 0
2,018	410.5
2,019	74
2,020	103.8
2,021	88.3
2,022	108.4
Thereafter	19.3
Total debt	$ 804.3

Derivatives and Financial Ins_3

Derivatives and Financial Instruments - Additional Information (Detail) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2018EUR (€)	Sep. 30, 2015EUR (€)
Derivative [Line Items]
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax		$ (6.1)	$ (29.6)
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset			10.8
Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amount		$ 361.6	$ 481.4
Senior Notes 2.45% Due 2019 | Senior Notes
Derivative [Line Items]
Amount of hedged item | €				€ 136,600,000	€ 500,000,000
Interest rate		2.45%		2.45%	2.45%
Tender Offer	$ 363.4

Derivatives and Financial Ins_4

Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Total debt	$ 804.3
Recorded Amount
Derivative [Line Items]
Variable rate debt	108.5	$ 62.4
Fixed rate debt	695.8	1,385.1
Total debt	804.3	1,447.5
Fair Value
Derivative [Line Items]
Variable rate debt	108.5	62.4
Fixed rate debt	698.7	1,424
Total debt	$ 807.2	$ 1,486.4

Derivatives and Financial Ins_5

Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 8.8
Foreign currency contract liabilities	(47.2)	$ (45.5)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.6
Foreign currency contract liabilities	(47.2)	(45.5)
Deferred compensation plan	23.2	27.5
Total recurring fair value measurements	(23.4)	(18)
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
Foreign currency contract liabilities	0	0
Deferred compensation plan	18.7	24.3
Total recurring fair value measurements	18.7	24.3
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	0.6
Foreign currency contract liabilities	(47.2)	(45.5)
Deferred compensation plan	4.5	3.2
Total recurring fair value measurements	(42.1)	(42.3)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0
Foreign currency contract liabilities	0	0
Deferred compensation plan	0	0
Total recurring fair value measurements	$ 0	$ 0

Income Taxes - Additional Info

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate			16.9708%	47.20%
Total gross liability for unrecognized tax benefits	$ 52.8	$ 12	$ 52.8
Provisional income tax expense		2.2
Decrease to provisional income tax expense	$ 3.6
Decrease of income tax expense related to remeasurement of certain deferred tax assets and liabilities due to lower tax rate		28
Transition tax expense		$ 26.6

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 1	$ 2.9	$ 3.1	$ 8.8
Interest cost	3	4.1	9	12.3
Expected return on plan assets	(2.2)	(2.9)	(6.7)	(8.7)
Actuarial loss	2.2	0	2.2	0
Net periodic benefit cost	$ 4	$ 4.1	$ 7.6	$ 12.4

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2017	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Benefits paid		$ 171.9
Minimum
Defined Benefit Plan Disclosure [Line Items]
Plan termination completion period	18 months
Maximum
Defined Benefit Plan Disclosure [Line Items]
Plan termination completion period	24 months

Shareholders' Equity - Additio

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2014	May 08, 2018	Dec. 31, 2017
Stockholders Equity Note Disclosure [Line Items]
Share repurchase (in shares)			7.8
Share repurchase			$ 400,000,000	$ 100,000,000
Cash dividends paid per ordinary share	$ 0.175	$ 0.345	$ 0.875	$ 1.035
Dividends payable	$ 30,400,000		$ 30,400,000				$ 63,100,000
December 2014 Share Repurchase Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Repurchase of shares of our common stock up to a maximum aggregate value					$ 1,000,000,000
Share repurchase (in shares)			2.2
Share repurchase			$ 150,000,000
Share repurchase program remaining available amount	$ 500,000,101		$ 500,000,101
May 2018 Share Repurchase Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Repurchase of shares of our common stock up to a maximum aggregate value						$ 750,000,000
Common stock authorized for repurchase, expiration date					May 31, 2021
Share repurchase (in shares)			5.6
Share repurchase			$ 250,000,000

Segment Information - Financial

Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 711.4	$ 687.6	$ 2,224.6	$ 2,124.9
Segment income	108.4	101.8	323.7	292.9
Aquatic Systems
Segment Reporting Information [Line Items]
Net sales	232.7	211.8	749.3	688
Segment income	59.9	53.1	199.5	182.9
Filtration Solutions
Segment Reporting Information [Line Items]
Net sales	240.4	242.4	754.1	737
Segment income	38.4	40.4	124.4	113.4
Flow Technologies
Segment Reporting Information [Line Items]
Net sales	238	233	720.2	698.8
Segment income	36.6	39.3	119.7	112.7
Other
Segment Reporting Information [Line Items]
Net sales	0.3	0.4	1	1.1
Segment income	(13.1)	(12.6)	(40.7)	(40.2)
Operating Segments
Segment Reporting Information [Line Items]
Segment income	$ 121.8	$ 120.2	$ 402.9	$ 368.8

Segment Information Reconciliat

Segment Information Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	$ 108.4	$ 101.8	$ 323.7	$ 292.9
Restructuring and other	(3.5)	(1.4)	(34.1)	(18.9)
Intangible amortization	(8.6)	(9.2)	(27)	(27.2)
Loss on sale of business	(0.2)	(3.8)	(6.4)	(3.8)
Loss on early extinguishment of debt	0	0	17.1	101.4
Other expense (income)	(2.1)	(1.1)		(3.2)
Income from continuing operations before income taxes	101.8	83	274	110.3
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment income	121.8	120.2	402.9	368.8
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and other	(3.5)	(1.4)	(34.1)	(18.9)
Intangible amortization	(8.6)	(9.2)	(27)	(27.2)
Loss on sale of business	(0.2)	(3.8)	(6.4)	(3.8)
Loss on early extinguishment of debt	0	0	17.1	101.4
Corporate allocations	0	(7.5)	(11)	(28.9)
Net interest expense	(4.3)	(13.9)	(27.9)	(74.2)
Other expense (income)	$ (3.4)	$ (1.4)	$ (5.4)	$ (4.1)

Commitments and Contingencies

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 124.2	$ 129.2

Commitments and Contingencies -

Commitments and Contingencies - Changes in Carrying Amount of Service and Product Warranties (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 38.1
Service and product warranty provision	43.2
Payments	(43.1)
Foreign currency translation	(0.2)
Ending balance	$ 38

Supplemental Guarantor Inform_3

Supplemental Guarantor Information - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 711.4	$ 687.6	$ 2,224.6	$ 2,124.9
Cost of goods sold	467.6	451.1	1,444.9	1,391.1
Gross profit	243.8	236.5	779.7	733.8
Selling, general and administrative	116.3	116.8	399	386.2
Research and development	19.1	17.9	57	54.7
Operating income	108.4	101.8	323.7	292.9
Loss (earnings) from continuing operations of investment in subsidiaries	0	0	0	0
Other (income) expense:
Loss on sale of business	0.2	3.8	6.4	3.8
Loss on early extinguishment of debt	0	0	17.1	101.4
Net interest (income) expense	4.3	13.9	27.9	74.2
Other Income			(1.7)
Other expense	2.1	1.1		3.2
Income from continuing operations before income taxes	101.8	83	274	110.3
Provision for income taxes	10.6	34.1	46.5	52.1
Net income from continuing operations	91.2	48.9	227.5	58.2
Income from discontinued operations, net of tax	18.9	78.2	27	219.8
Gain from sale of discontinued operations, net of tax	0	(1.7)	0	198.9	$ (181.1)
(Loss) earnings from discontinued operations of investment in subsidiaries	0	0	0	0
Comprehensive income, net of tax
Net income	110.1	125.4	254.5	476.9
Changes in cumulative translation adjustment	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	107	156.9	276.9	977.4
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative	2.3	4.2	10.4	6.8
Research and development	0	0	0	0
Operating income	(2.3)	(4.2)	(10.4)	(6.8)
Loss (earnings) from continuing operations of investment in subsidiaries	(93.5)	(52.7)	(240.4)	(64.6)
Other (income) expense:
Loss on sale of business	0	0	0	0
Loss on early extinguishment of debt		0	0	0
Net interest (income) expense	0	0	0	0
Other Income			0
Other expense	0	0		0
Income from continuing operations before income taxes	91.2	48.5	230	57.8
Provision for income taxes	0	(0.4)	2.5	(0.4)
Net income from continuing operations	91.2	48.9	227.5	58.2
Income from discontinued operations, net of tax	0	0	0	0
Gain from sale of discontinued operations, net of tax		0		0
(Loss) earnings from discontinued operations of investment in subsidiaries	18.9	76.5	27	418.7
Comprehensive income, net of tax
Net income	110.1	125.4	254.5	476.9
Changes in cumulative translation adjustment	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	107	156.9	276.9	977.4
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative	0	0	0	0.2
Research and development	0	0	0	0
Operating income	0	0	0	(0.2)
Loss (earnings) from continuing operations of investment in subsidiaries	(93.3)	(52.5)	(239.4)	(64.5)
Other (income) expense:
Loss on sale of business	0	0	0	0
Loss on early extinguishment of debt		0	0	0
Net interest (income) expense	(0.2)	(0.2)	(1)	(0.3)
Other Income			0
Other expense	0	0		0
Income from continuing operations before income taxes	93.5	52.7	240.4	64.6
Provision for income taxes	0	0	0	0
Net income from continuing operations	93.5	52.7	240.4	64.6
Income from discontinued operations, net of tax	0	0	0	0
Gain from sale of discontinued operations, net of tax		0		0
(Loss) earnings from discontinued operations of investment in subsidiaries	18.9	76.5	27	418.7
Comprehensive income, net of tax
Net income	112.4	129.2	267.4	483.3
Changes in cumulative translation adjustment	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	109.3	160.7	289.8	983.8
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative	0.2	0	0.7	0.3
Research and development	0	0	0	0
Operating income	(0.2)	0	(0.7)	(0.3)
Loss (earnings) from continuing operations of investment in subsidiaries	(69.5)	(37.1)	(278.9)	(215.9)
Other (income) expense:
Loss on sale of business	0	0	0	0
Loss on early extinguishment of debt		0	17.1	91
Net interest (income) expense	1.7	10.3	21.7	60.6
Other Income			0
Other expense	0	0		0
Income from continuing operations before income taxes	67.6	26.8	239.4	64
Provision for income taxes	0	0	0	0
Net income from continuing operations	67.6	26.8	239.4	64
Income from discontinued operations, net of tax	0	0	0	0
Gain from sale of discontinued operations, net of tax		0		0
(Loss) earnings from discontinued operations of investment in subsidiaries	18.9	76.5	27	418.7
Comprehensive income, net of tax
Net income	86.5	103.3	266.4	482.7
Changes in cumulative translation adjustment	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	83.4	134.8	288.8	983.2
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	711.4	687.6	2,224.6	2,124.9
Cost of goods sold	467.6	451.1	1,444.9	1,391.1
Gross profit	243.8	236.5	779.7	733.8
Selling, general and administrative	113.8	112.6	387.9	378.9
Research and development	19.1	17.9	57	54.7
Operating income	110.9	106	334.8	300.2
Loss (earnings) from continuing operations of investment in subsidiaries	0	0	0	0
Other (income) expense:
Loss on sale of business	0.2	3.8	6.4	3.8
Loss on early extinguishment of debt		0	0	10.4
Net interest (income) expense	2.8	3.8	7.2	13.9
Other Income			(1.7)
Other expense	2.1	1.1		3.2
Income from continuing operations before income taxes	105.8	97.3	322.9	268.9
Provision for income taxes	10.6	34.5	44	52.5
Net income from continuing operations	95.2	62.8	278.9	216.4
Income from discontinued operations, net of tax	18.9	78.2	27	219.8
Gain from sale of discontinued operations, net of tax		(1.7)		198.9
(Loss) earnings from discontinued operations of investment in subsidiaries	0	0	0	0
Comprehensive income, net of tax
Net income	114.1	139.3	305.9	635.1
Changes in cumulative translation adjustment	(2.1)	34.5	23.1	502.8
Changes in market value of derivative financial instruments, net of tax	(1)	(3)	(0.7)	(2.3)
Comprehensive income	111	170.8	328.3	1,135.6
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative	0	0	0	0
Research and development	0	0	0	0
Operating income	0	0	0	0
Loss (earnings) from continuing operations of investment in subsidiaries	256.3	142.3	758.7	345
Other (income) expense:
Loss on sale of business	0	0	0	0
Loss on early extinguishment of debt		0	0	0
Net interest (income) expense	0	0	0	0
Other Income			0
Other expense	0	0		0
Income from continuing operations before income taxes	(256.3)	(142.3)	(758.7)	(345)
Provision for income taxes	0	0	0	0
Net income from continuing operations	(256.3)	(142.3)	(758.7)	(345)
Income from discontinued operations, net of tax	0	0	0	0
Gain from sale of discontinued operations, net of tax		0		0
(Loss) earnings from discontinued operations of investment in subsidiaries	(56.7)	(229.5)	(81)	(1,256.1)
Comprehensive income, net of tax
Net income	(313)	(371.8)	(839.7)	(1,601.1)
Changes in cumulative translation adjustment	6.3	(103.5)	(69.3)	(1,508.4)
Changes in market value of derivative financial instruments, net of tax	3	9	2.1	6.9
Comprehensive income	$ (303.7)	$ (466.3)	$ (906.9)	$ (3,102.6)

Supplemental Guarantor Inform_4

Supplemental Guarantor Information - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 64.7		$ 86.3		$ 81.3	$ 81.3	$ 216.9
Accounts and notes receivable, net	402.4	$ 485.8	483.1
Inventories	387.3	355.3	356.9
Other current assets	135.2	116.1	114.5
Current assets held for sale	0	711.8	708
Total current assets	989.6		1,748.8
Property, plant and equipment, net	274.2		279.8
Other assets
Investments in subsidiaries	0		0
Goodwill	2,097		2,112.8
Intangibles, net	289.4		321.8
Long-term intercompany debt			0
Other non-current assets	159.3	136	180.9
Non-current assets held for sale	0	3,788	3,989.6
Total other assets	2,545.7		6,605.1
Total assets	3,809.5		8,633.7
Current liabilities
Accounts payable	261.3		321.5
Employee compensation and benefits	85		115.8
Other current liabilities	361.1	404	401.3
Current liabilities held for sale	0		360.8
Total current liabilities	707.4		1,199.4
Other liabilities
Long-term debt	798.8		1,440.7
Pension and other post-retirement compensation and benefits	109.8		96.4
Deferred tax liabilities	106.3	105	108.6
Other non-current liabilities	207		213.8
Non-current liabilities held for sale	0	$ 510.4	537
Total liabilities	1,929.3		3,595.9
Equity
Total equity	1,880.2		5,037.8	$ 5,008.6			4,254.4
Total liabilities and equity	3,809.5		8,633.7
Parent Company Guarantor
Current assets
Cash and cash equivalents	0.1		0		0.1		0
Accounts and notes receivable, net	0		0
Inventories	0		0
Other current assets	14.3		10.8
Current assets held for sale			0
Total current assets	14.4		10.8
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	1,908.9		5,205.1
Goodwill	0		0
Intangibles, net	0		0
Long-term intercompany debt			0
Other non-current assets	23.4		2.2
Non-current assets held for sale			0
Total other assets	1,932.3		5,207.3
Total assets	1,946.7		5,218.1
Current liabilities
Accounts payable	2		1.4
Employee compensation and benefits	0.5		0.4
Other current liabilities	42.1		99.6
Current liabilities held for sale			0
Total current liabilities	44.6		101.4
Other liabilities
Long-term debt	0		48.4
Pension and other post-retirement compensation and benefits	0		0
Deferred tax liabilities	0		0
Other non-current liabilities	21.9		30.5
Non-current liabilities held for sale			0
Total liabilities	66.5		180.3
Equity
Total equity	1,880.2		5,037.8
Total liabilities and equity	1,946.7		5,218.1
Guarantor Subsidiaries
Current assets
Cash and cash equivalents	0		0		0		0
Accounts and notes receivable, net	0		0
Inventories	0		0
Other current assets	0		1.8
Current assets held for sale			0
Total current assets	0		1.8
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	1,840.2		5,109.6
Goodwill	0		0
Intangibles, net	0		0
Long-term intercompany debt			94.1
Other non-current assets	69.1		0
Non-current assets held for sale			0
Total other assets	1,909.3		5,203.7
Total assets	1,909.3		5,205.5
Current liabilities
Accounts payable	0		0
Employee compensation and benefits	0		0
Other current liabilities	0.4		0.4
Current liabilities held for sale			0
Total current liabilities	0.4		0.4
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		0.4
Equity
Total equity	1,908.9		5,205.1
Total liabilities and equity	1,909.3		5,205.5
Subsidiary Issuer
Current assets
Cash and cash equivalents	0.1		0		0.3		0
Accounts and notes receivable, net	1.8		0
Inventories	0		0
Other current assets	7.1		1.6
Current assets held for sale			0
Total current assets	9		1.6
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	2,476.5		7,156.1
Goodwill	0		0
Intangibles, net	0		0
Long-term intercompany debt			614
Other non-current assets	672.9		0
Non-current assets held for sale			0
Total other assets	3,149.4		7,770.1
Total assets	3,158.4		7,771.7
Current liabilities
Accounts payable	0		0
Employee compensation and benefits	0		0
Other current liabilities	4.3		9.5
Current liabilities held for sale			0
Total current liabilities	4.3		9.5
Other liabilities
Long-term debt	1,314.1		2,652.8
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	1,318.4		2,662.3
Equity
Total equity	1,840		5,109.4
Total liabilities and equity	3,158.4		7,771.7
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	64.5		86.3		80.9		216.9
Accounts and notes receivable, net	400.6		483.1
Inventories	387.3		356.9
Other current assets	124.5		109.5
Current assets held for sale			708
Total current assets	976.9		1,743.8
Property, plant and equipment, net	274.2		279.8
Other assets
Investments in subsidiaries	0		0
Goodwill	2,097		2,112.8
Intangibles, net	289.4		321.8
Long-term intercompany debt			(708.1)
Other non-current assets	726.8		2,159.4
Non-current assets held for sale			3,989.6
Total other assets	3,113.2		7,875.5
Total assets	4,364.3		9,899.1
Current liabilities
Accounts payable	259.3		320.1
Employee compensation and benefits	84.5		115.4
Other current liabilities	325		301
Current liabilities held for sale			360.8
Total current liabilities	668.8		1,097.3
Other liabilities
Long-term debt	817.6		720.2
Pension and other post-retirement compensation and benefits	109.8		96.4
Deferred tax liabilities	106.3		108.6
Other non-current liabilities	185.1		183.3
Non-current liabilities held for sale			537
Total liabilities	1,887.6		2,742.8
Equity
Total equity	2,476.7		7,156.3
Total liabilities and equity	4,364.3		9,899.1
Consolidation, Eliminations
Current assets
Cash and cash equivalents	0		0		$ 0		$ 0
Accounts and notes receivable, net	0		0
Inventories	0		0
Other current assets	(10.7)		(9.2)
Current assets held for sale			0
Total current assets	(10.7)		(9.2)
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	(6,225.6)		(17,470.8)
Goodwill	0		0
Intangibles, net	0		0
Long-term intercompany debt			0
Other non-current assets	(1,332.9)		(1,980.7)
Non-current assets held for sale			0
Total other assets	(7,558.5)		(19,451.5)
Total assets	(7,569.2)		(19,460.7)
Current liabilities
Accounts payable	0		0
Employee compensation and benefits	0		0
Other current liabilities	(10.7)		(9.2)
Current liabilities held for sale			0
Total current liabilities	(10.7)		(9.2)
Other liabilities
Long-term debt	(1,332.9)		(1,980.7)
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	(1,343.6)		(1,989.9)
Equity
Total equity	(6,225.6)		(17,470.8)
Total liabilities and equity	$ (7,569.2)		$ (19,460.7)

Supplemental Guarantor Inform_5

Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating activities
Net cash provided by (used for) operating activities		$ 284.6	$ 361.8
Investing activities
Capital expenditures		(33.8)	(25.4)
Proceeds from sale of property and equipment		(0.4)	3.2
(Payments due to) proceeds from the sale of businesses, net		(12.8)	2,764
Acquisitions, net of cash acquired		(0.9)	(45.9)
Net intercompany loan activity		0	0
Net cash provided by (used for) investing activities of continuing operations		(47.9)	2,695.9
Net cash provided by (used for) investing activities of discontinued operations		(7.1)	(41.3)
Net cash provided by (used for) investing activities		(55)	2,654.6
Financing activities
Net receipts of short-term borrowings		0	(0.8)
Net receipts (repayments) of commercial paper and revolving long-term debt		46	(842.3)
Repayments of long-term debt		(675.1)	(2,009.3)
Debt issuance costs		(2)	0
Premium paid on early extinguishment of debt		(16)	(94.9)
Transfer of cash to nVent		(74.2)	0
Distribution of cash from nVent	$ 993.6	993.6	0
Net change in advances to subsidiaries		0	0
Shares issued to employees, net of shares withheld		16	34.3
Repurchases of ordinary shares		(400)	(100)
Dividends paid		(156.7)	(188.9)
Net cash provided by (used for) financing activities of continuing operations		(268.4)	(3,201.9)
Change in cash held for sale		27	(5.6)
Effect of exchange rate changes on cash and cash equivalents		(9.8)	55.5
Change in cash and cash equivalents		(21.6)	(135.6)
Cash and cash equivalents, beginning of period		86.3	216.9	$ 216.9
Cash and cash equivalents, end of period		64.7		86.3
Parent Company Guarantor
Operating activities
Net cash provided by (used for) operating activities		180.9	356.3
Investing activities
Capital expenditures		0	0
Proceeds from sale of property and equipment		0	0
(Payments due to) proceeds from the sale of businesses, net		0	0
Acquisitions, net of cash acquired		0	0
Net intercompany loan activity		0	0
Net cash provided by (used for) investing activities of continuing operations		0	0
Net cash provided by (used for) investing activities of discontinued operations		0	0
Net cash provided by (used for) investing activities		0	0
Financing activities
Net receipts of short-term borrowings			0
Net receipts (repayments) of commercial paper and revolving long-term debt		0	0
Repayments of long-term debt		0	0
Debt issuance costs		0
Premium paid on early extinguishment of debt		0	0
Transfer of cash to nVent		0
Distribution of cash from nVent		0
Net change in advances to subsidiaries		359.9	(101.6)
Shares issued to employees, net of shares withheld		16	34.3
Repurchases of ordinary shares		(400)	(100)
Dividends paid		(156.7)	(188.9)
Net cash provided by (used for) financing activities of continuing operations		(180.8)	(356.2)
Change in cash held for sale		0	0
Effect of exchange rate changes on cash and cash equivalents		0	0
Change in cash and cash equivalents		0.1	0.1
Cash and cash equivalents, beginning of period		0	0	0
Cash and cash equivalents, end of period		0.1		0
Guarantor Subsidiaries
Operating activities
Net cash provided by (used for) operating activities		269.2	481.8
Investing activities
Capital expenditures		0	0
Proceeds from sale of property and equipment		0	0
(Payments due to) proceeds from the sale of businesses, net		0	0
Acquisitions, net of cash acquired		0	0
Net intercompany loan activity		24.9	0
Net cash provided by (used for) investing activities of continuing operations		24.9	0
Net cash provided by (used for) investing activities of discontinued operations		0	0
Net cash provided by (used for) investing activities		24.9	0
Financing activities
Net receipts of short-term borrowings			0
Net receipts (repayments) of commercial paper and revolving long-term debt		0	0
Repayments of long-term debt		0	0
Debt issuance costs		0
Premium paid on early extinguishment of debt		0	0
Transfer of cash to nVent		0
Distribution of cash from nVent		0
Net change in advances to subsidiaries		(294.1)	(481.8)
Shares issued to employees, net of shares withheld		0	0
Repurchases of ordinary shares		0	0
Dividends paid		0	0
Net cash provided by (used for) financing activities of continuing operations		(294.1)	(481.8)
Change in cash held for sale		0	0
Effect of exchange rate changes on cash and cash equivalents		0	0
Change in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0	0
Cash and cash equivalents, end of period		0		0
Subsidiary Issuer
Operating activities
Net cash provided by (used for) operating activities		274.7	464.4
Investing activities
Capital expenditures		0	0
Proceeds from sale of property and equipment		0	0
(Payments due to) proceeds from the sale of businesses, net		0	2,765.6
Acquisitions, net of cash acquired		0	0
Net intercompany loan activity		(62)	119.4
Net cash provided by (used for) investing activities of continuing operations		(62)	2,885
Net cash provided by (used for) investing activities of discontinued operations		0	0
Net cash provided by (used for) investing activities		(62)	2,885
Financing activities
Net receipts of short-term borrowings			0
Net receipts (repayments) of commercial paper and revolving long-term debt		65	(832.7)
Repayments of long-term debt		(675.1)	(1,917.8)
Debt issuance costs		(2)
Premium paid on early extinguishment of debt		(16)	(86)
Transfer of cash to nVent		0
Distribution of cash from nVent		993.6
Net change in advances to subsidiaries		(563.9)	(579.3)
Shares issued to employees, net of shares withheld		0	0
Repurchases of ordinary shares		0	0
Dividends paid		0	0
Net cash provided by (used for) financing activities of continuing operations		(198.4)	(3,415.8)
Change in cash held for sale		0	0
Effect of exchange rate changes on cash and cash equivalents		(14.2)	66.7
Change in cash and cash equivalents		0.1	0.3
Cash and cash equivalents, beginning of period		0	0	0
Cash and cash equivalents, end of period		0.1		0
Non-Guarantor Subsidiaries
Operating activities
Net cash provided by (used for) operating activities		480.5	660.3
Investing activities
Capital expenditures		(33.8)	(25.4)
Proceeds from sale of property and equipment		(0.4)	3.2
(Payments due to) proceeds from the sale of businesses, net		(12.8)	(1.6)
Acquisitions, net of cash acquired		(0.9)	(45.9)
Net intercompany loan activity		618.7	136
Net cash provided by (used for) investing activities of continuing operations		570.8	66.3
Net cash provided by (used for) investing activities of discontinued operations		(7.1)	(41.3)
Net cash provided by (used for) investing activities		563.7	25
Financing activities
Net receipts of short-term borrowings			(0.8)
Net receipts (repayments) of commercial paper and revolving long-term debt		(19)	(9.6)
Repayments of long-term debt		0	(91.5)
Debt issuance costs		0
Premium paid on early extinguishment of debt		0	(8.9)
Transfer of cash to nVent		(74.2)
Distribution of cash from nVent		0
Net change in advances to subsidiaries		(1,004.2)	(693.7)
Shares issued to employees, net of shares withheld		0	0
Repurchases of ordinary shares		0	0
Dividends paid		0	0
Net cash provided by (used for) financing activities of continuing operations		(1,097.4)	(804.5)
Change in cash held for sale		27	(5.6)
Effect of exchange rate changes on cash and cash equivalents		4.4	(11.2)
Change in cash and cash equivalents		(21.8)	(136)
Cash and cash equivalents, beginning of period		86.3	216.9	216.9
Cash and cash equivalents, end of period		64.5		86.3
Consolidation, Eliminations
Operating activities
Net cash provided by (used for) operating activities		(920.7)	(1,601)
Investing activities
Capital expenditures		0	0
Proceeds from sale of property and equipment		0	0
(Payments due to) proceeds from the sale of businesses, net		0	0
Acquisitions, net of cash acquired		0	0
Net intercompany loan activity		(581.6)	(255.4)
Net cash provided by (used for) investing activities of continuing operations		(581.6)	(255.4)
Net cash provided by (used for) investing activities of discontinued operations		0	0
Net cash provided by (used for) investing activities		(581.6)	(255.4)
Financing activities
Net receipts of short-term borrowings			0
Net receipts (repayments) of commercial paper and revolving long-term debt		0	0
Repayments of long-term debt		0	0
Debt issuance costs		0
Premium paid on early extinguishment of debt		0	0
Transfer of cash to nVent		0
Distribution of cash from nVent		0
Net change in advances to subsidiaries		1,502.3	1,856.4
Shares issued to employees, net of shares withheld		0	0
Repurchases of ordinary shares		0	0
Dividends paid		0	0
Net cash provided by (used for) financing activities of continuing operations		1,502.3	1,856.4
Change in cash held for sale		0	0
Effect of exchange rate changes on cash and cash equivalents		0	0
Change in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	$ 0	0
Cash and cash equivalents, end of period		$ 0		$ 0

Supplemental Guarantor Inform_6

Supplemental Guarantor Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Ownership percentage	100.00%