Pentair (PNR) 10-Q 21 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 28, 2015
Document Information [Line Items]
Entity Registrant Name	PENTAIR plc
Entity Central Index Key	77360
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	28-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Trading Symbol	PNR
Entity Common Stock, Shares Outstanding	179,638,771

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Net sales	$1,475	$1,644
Cost of goods sold	964.8	1,079.90
Gross profit	510.2	564.1
Selling, general and administrative	309.2	352.5
Research and development	29.8	29.5
Operating income	171.2	182.1
Other (income) expense:
Equity income of unconsolidated subsidiaries	-0.5	-0.3
Net interest expense	18.2	16.1
Income from continuing operations before income taxes	153.5	166.3
Provision for income taxes	35.3	40.8
Net income from continuing operations	118.2	125.5
Loss from discontinued operations, net of tax	-4.3	-1.3
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	0	-5.6
Net income	113.9	118.6
Comprehensive income (loss), net of tax
Net income	113.9	118.6
Changes in cumulative translation adjustment	-174.2	-27.9
Changes in market value of derivative financial instruments, net of $0.2 and $0.1 tax, respectively	-0.1	0.2
Comprehensive income (loss)	($60.40)	$90.90
Earnings (loss) per ordinary share
Income (Loss) from Continuing Operations, Per Basic Share	$0.66	$0.64
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	($0.03)	($0.04)
Basic (USD per share)	$0.63	$0.60
Income (Loss) from Continuing Operations, Per Diluted Share	$0.65	$0.63
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	($0.03)	($0.04)
Diluted (USD per share)	$0.62	$0.59
Weighted average ordinary shares outstanding
Basic (shares)	180.1	196.2
Diluted (shares)	182.7	199.7
Common Stock, Dividends, Per Share, Cash Paid	$0.32	$0.25

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) Condensed Consolidated Statements of Operations and Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Condensed Consolidated Statements of Operations and Comprehensive Income (Parenthetical) [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	$0.20	$0.10

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets
Cash and cash equivalents	$131.10	$110.40
Accounts and notes receivable, net of allowances of $84.9 and $96.5, respectively	1,247.50	1,205.90
Inventories	1,177	1,130.40
Other current assets	412.5	366.8
Assets of Disposal Group, Including Discontinued Operation, Current	8.8	80.6
Total current assets	2,976.90	2,894.10
Property, plant and equipment, net	915.4	950
Other assets
Goodwill	4,671.80	4,741.90
Intangibles, net	1,559.10	1,608.10
Other non-current assets	420.3	436.2
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	25.9	24.9
Total other assets	6,677.10	6,811.10
Total assets	10,569.40	10,655.20
Current liabilities
Current maturities of long-term debt and short-term borrowings	5.6	6.7
Accounts payable	504.9	583.1
Employee compensation and benefits	254.9	305.5
Other current liabilities	654.2	709.1
Liabilities of Disposal Group, Including Discontinued Operation, Current	11.5	35.1
Total current liabilities	1,431.10	1,639.50
Other liabilities
Long-term debt	3,403.40	2,997.40
Pension and other post-retirement compensation and benefits	300.9	322
Deferred tax liabilities	516.3	528.3
Other non-current liabilities	490.4	497.7
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	4	6.5
Total liabilities	6,146.10	5,991.40
Equity
Ordinary shares $0.01, 426.0 authorized, 199.3 and 202.4 issued at March 28, 2015 and December 31, 2014, respectively	2	2
Ordinary shares held in treasury, 19.5 and 19.9 shares at March 28, 2015 and December 31, 2014, respectively	-1,230.80	-1,251.90
Additional paid-in capital	4,048.80	4,250
Retained earnings	2,157.90	2,044
Accumulated other comprehensive income (loss)	-554.6	-380.3
Total equity	4,423.30	4,663.80
Total equity	4,423.30	4,663.80
Total liabilities and equity	$10,569.40	$10,655.20

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, except Per Share data, unless otherwise specified
Accounts and notes receivable, allowances	$84.90	$96.50
Common shares, par value	$0.01	$0.01
Common shares, authorized	426	426
Common shares, issued	199.3	202.4
Treasury stock, shares	19.5	19.9

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Operating activities
Net income	$113.90	$118.60
Income (Loss) from Discontinued Operations, Net of Tax	-4.3	-1.3
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	0	5.6
Net Income (Loss) from Continuing Operations	118.2	125.5
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	-0.5	-0.3
Depreciation	32.4	34.8
Amortization	27.6	28.5
Deferred income taxes	5.7	-1.4
Share-based compensation	9.7	7.4
Excess tax benefits from share-based compensation	-2.8	-6.1
Loss (gain) on sale of assets	-1.2	0.3
Changes in assets and liabilities, net of effects of business acquisitions
Accounts and notes receivable	-85.8	-76.9
Inventories	-88.2	-34.5
Other current assets	-71	-32.2
Accounts payable	-60.2	-35.7
Employee compensation and benefits	-33.7	-49.3
Other current liabilities	38.8	33.4
Other non-current assets and liabilities	-15.2	-6.2
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	-126.2	-12.7
Cash Provided by (Used in) Operating Activities, Discontinued Operations	-7	15.2
Net cash provided by (used for) operating activities of continuing operations	-133.2	2.5
Investing activities
Capital expenditures	-34.8	-27.2
Proceeds from sale of property and equipment	2.3	0.4
Payments to Acquire Businesses, Net of Cash Acquired	-3	0
Other	0	-0.5
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	-35.5	-27.3
Cash Provided by (Used in) Investing Activities, Discontinued Operations	54.9	0
Net cash provided by (used for) investing activities of continuing operations	19.4	-27.3
Financing activities
Net receipts of short-term borrowings	0	0.3
Net receipts of commercial paper and revolving long-term debt	406	381.9
Repayments of long-term debt	-0.4	-0.9
Excess tax benefits from share-based compensation	2.8	6.1
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	8.7	24
Repurchases of ordinary shares	-200	-252.2
Dividends paid	-57.5	-49.2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	0	-134.7
Net cash provided by (used for) financing activities	159.6	-24.7
Effect of exchange rate changes on cash and cash equivalents	-25.1	-2.6
Change in cash and cash equivalents	20.7	-52.1
Cash and cash equivalents, beginning of period	110.4	256
Cash and cash equivalents, end of period	$131.10	$203.90

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Changes in Equity (USD $)	Total	Ordinary shares	Treasury shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Total Pentair plc	Noncontrolling interest
In Millions
Beginning Balance at Dec. 31, 2013	$6,217.70	$113.50	($875.10)	$5,071.40	$1,829.10	($43.60)	$6,095.30	$122.40
Beginning Balance (in shares) at Dec. 31, 2013		-213	-15.6
Net income	118.6				118.6		118.6	0
Other Comprehensive Income (Loss), Net of Tax	-27.7					-27.7	-27.7	0
Dividends declared	0.6			0.6	0		0.6
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	134.7			12.3			12.3	122.4
Share repurchase	-269.6		-269.6				-269.6
Share repurchase (in shares)			-3.5
Exercise of options, net of shares tendered for payment	27.2	0	34.3	-7.1			27.2
Exercise of options, net of shares tendered for payment (in shares)		0	0.7
Issuance of restricted shares, net of cancellations	0	0	7.3	-7.3			0
Issuance of restricted shares, net of cancellations (in shares)		0	0.2
Shares surrendered by employees to pay taxes	-3.2	0	-2	-1.2			-3.2
Shares surrendered by employees to pay taxes (in shares)		0	-0.1
Share-based compensation	7.4			7.4			7.4
Ending Balance at Mar. 29, 2014	5,936.30	113.5	-1,105.10	5,051.50	1,947.70	-71.3	5,936.30	0
Ending Balance (in shares) at Mar. 29, 2014		-213	-18.3
Beginning Balance at Dec. 31, 2014	4,663.80	2	-1,251.90	4,250	2,044	-380.3	4,663.80	0
Beginning Balance (in shares) at Dec. 31, 2014		-202.4	19.9
Net income	113.9				113.9		113.9	0
Other Comprehensive Income (Loss), Net of Tax	-174.3					-174.3	-174.3
Dividends declared	1.5			1.5			1.5
Share repurchase	-200		0	-200			-200
Share repurchase (in shares)	-3.1	-3.1	0
Exercise of options, net of shares tendered for payment	12.2		16	-3.8			12.2
Exercise of options, net of shares tendered for payment (in shares)			0.3
Issuance of restricted shares, net of cancellations			7.7	-7.7
Issuance of restricted shares, net of cancellations (in shares)			0.2
Shares surrendered by employees to pay taxes	-3.5		-2.6	-0.9			-3.5
Shares surrendered by employees to pay taxes (in shares)			-0.1
Share-based compensation	9.7			9.7			9.7
Ending Balance at Mar. 28, 2015	$4,423.30	$2	($1,230.80)	$4,048.80	$2,157.90	($554.60)	$4,423.30	$0
Ending Balance (in shares) at Mar. 28, 2015		-199.3	19.5

Basis_of_Presentation_and_Resp

Basis of Presentation and Responsibility for Interim Financial Statements	3 Months Ended
	Mar. 28, 2015
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 (formerly Pentair Ltd.) 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 can be condensed or omitted.
	In December 2013, the Company’s Board of Directors approved changing the Company’s jurisdiction of organization from Switzerland to Ireland. At an extraordinary meeting of shareholders on May 20, 2014, Pentair Ltd. shareholders voted in favor of a reorganization proposal pursuant to which Pentair Ltd. would merge into Pentair plc, an Irish company, and all Pentair Ltd. CHF 0.50 par value common shares would be canceled and all holders of such shares would receive $0.01 par value ordinary shares of Pentair plc on a one-for-one basis. The reorganization transaction was completed on June 3, 2014, at which time Pentair plc replaced Pentair Ltd. as our ultimate parent company (the "Redomicile"). Shares of Pentair plc began trading on the New York Stock Exchange on June 3, 2014 under the symbol "PNR," the same symbol under which Pentair Ltd. shares were previously traded. Although our jurisdiction of organization is Ireland, we manage our affairs so that we are centrally managed and controlled in the United Kingdom (the "U.K.") and therefore have our tax residency in the U.K.
	During the first quarter of 2015, we reorganized our business segments to reflect a new operating structure and management of our Global Business Units, Valves & Controls, Flow & Filtration Solutions, Water Quality Systems and Technical Solutions. All prior period amounts related to the segment change have been retrospectively reclassified throughout this Quarterly Report on Form 10-Q to conform to the new presentation.
	We are responsible for the unaudited 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, 2014.
	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 13-week basis ending on a Saturday.
	New Accounting Standards
	In May 2014, the Financial Accounting Standards Board issued new accounting requirements for the recognition of revenue from contracts with customers. The new requirements also include additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  The requirements are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with earlier adoption not permitted. We have not yet determined the potential effects on our financial condition or results of operations.

Acquisitions_Acquisitions_Note

Acquisitions Acquisitions (Notes)	3 Months Ended
	Mar. 28, 2015
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	On January 30, 2014, we acquired, as part of Water Quality Systems, the remaining 19.9 percent ownership interest in a U.S. entity and an international entity (collectively, "Pentair Residential Filtration" or "PRF"), from GE Water & Process Technologies (a unit of General Electric Company) ("GE") for $134.3 million in cash. Prior to the acquisition, we held an 80.1 percent ownership equity interest in PRF, representing our and GE's respective global water softener and residential water filtration businesses. There was no material pro forma impact from this acquisition as the results of PRF were consolidated into our financial statements prior to acquiring the remaining interest.
	In April 2015, we acquired, as part of Technical Solutions, all of the outstanding shares of capital stock of Nuheat Industries Limited ("Nuheat") for approximately $96.4 million in cash. Based in Canada, Nuheat is a leading manufacturer of electric floor heating systems that are distributed across North America.

Discontinued_Operations_and_Di

Discontinued Operations and Divestitures	3 Months Ended
	Mar. 28, 2015
Business Combinations [Abstract]
Discontinued Operations and Divestitures	Discontinued Operations
	On July 28, 2014, our Board of Directors approved a decision to exit our Water Transport business in Australia. During the first quarter of 2015, we sold portions of the Water Transport business and received cash proceeds of $54.9 million. In addition, during the first quarter of 2014 we sold a portion of our Water Transport business resulting in a loss of $5.6 million, net of a $2.4 million tax benefit. We expect to dispose of the remainder of the Water Transport business by mid-2015. The results of the Water Transport business have been presented as discontinued operations and the assets and liabilities of the Water Transport business have been reclassified as held for sale for all periods presented.
	Operating results of discontinued operations are summarized below:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Net sales	$	18.6		$	82.6
	Cost of goods sold	18.1			68.4
	Gross profit	$	0.5		$	14.2
	Loss from discontinued operations before income taxes	$	(5.6	)	$	(1.7	)
	Income tax benefit	1.3			0.4
	Loss from discontinued operations, net of tax	$	(4.3	)	$	(1.3	)
	Loss from sale / impairment of discontinued operations before income taxes	$	—		$	(8.0	)
	Income tax benefit	—			2.4
	Loss from sale / impairment of discontinued operations, net of tax	$	—		$	(5.6	)
	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	March 28,			December 31,
		2015			2014
	Cash and cash equivalents	$	0.2		$	7
	Accounts and notes receivable, net	1.6			28.8
	Inventories	—			30.1
	Other current assets	7			14.7
	Current assets held for sale	$	8.8		$	80.6
	Property, plant and equipment, net	$	18		$	18.5
	Other non-current assets	7.9			6.4
	Non-current assets held for sale	$	25.9		$	24.9
	Accounts payable	2.1			12.2
	Employee compensation and benefits	4.1			11.3
	Other current liabilities	5.3			11.6
	Current liabilities held for sale	$	11.5		$	35.1
	Long-term debt	$	3.9		$	4
	Pension and other post-retirement compensation and benefits	0.1			2.5
	Non-current liabilities held for sale	$	4		$	6.5

Share_Plans

Share Plans	3 Months Ended
	Mar. 28, 2015
Share Plans	Share Plans
	Total share-based compensation expense for the three months ended March 28, 2015 and March 29, 2014 was as follows:
		Three months ended
	In millions	March 28,		March 29,
		2015		2014
	Restricted stock units	$	6.2	$	4.9
	Stock options	3.5		2.5
	Total share-based compensation expense	$	9.7	$	7.4
	In the first quarter of 2015, 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 0.6 million were stock options and 0.2 million were restricted stock units. The weighted-average grant date fair value of the stock options and restricted stock units issued was $16.73 and $66.44, 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:
		2015
		Annual Grant
	Risk-free interest rate	1.61	%
	Expected dividend yield	1.96	%
	Expected share price volatility	30.4	%
	Expected term (years)	6
	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.

Restructuring

Restructuring	3 Months Ended
	Mar. 28, 2015
Restructuring	Restructuring
	During the three months ended March 28, 2015, there was no new restructuring activity initiated. However, we continued execution of certain business restructuring initiatives aimed at reducing our fixed cost structure and realigning our business. Initiatives during the year ended December 31, 2014 included the reduction in hourly and salaried headcount of approximately 1,150 employees, consisting of approximately 600 in Valves & Controls, 350 in Flow & Filtration Solutions, 50 in Water Quality Systems and 150 in Technical Solutions.
	Restructuring related costs included in Selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) included costs for severance and other restructuring costs as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Severance and related costs	$	—		$	13.4
	Other	—			4
	Total restructuring costs	$	—		$	17.4
	Other restructuring costs primarily consist of asset impairment and various contract termination costs.
	Restructuring costs by reportable segment for the three months ended March 28, 2015 and March 29, 2014 were as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Valves & Controls	$	—		$	9.8
	Flow & Filtration Solutions	—			4.7
	Water Quality Systems	—			0.3
	Technical Solutions	—			2.6
	Consolidated	$	—		$	17.4
	Activity in the restructuring accrual recorded in Other current liabilities and Employee compensation and benefits in the Condensed Consolidated Balance Sheets is summarized as follows for the three months ended March 28, 2015:
	In millions	March 28,
		2015
	Beginning balance	$	73.4
	Cash payments and other	(12.5		)
	Ending balance	$	60.9

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 28, 2015
Earnings Per Share	Earnings Per Share
	Basic and diluted earnings per share were calculated as follows:
		Three months ended
	In millions, except per-share data	March 28,			March 29,
		2015			2014
	Net income	$	113.9		$	118.6
	Net income from continuing operations	$	118.2		$	125.5
	Weighted average ordinary shares outstanding
	Basic	180.1			196.2
	Dilutive impact of stock options and restricted stock units	2.6			3.5
	Diluted	182.7			199.7
	Earnings (loss) per ordinary share
	Basic
	Continuing operations	$	0.66		$	0.64
	Discontinued operations	(0.03		)	(0.04		)
	Basic earnings per ordinary share	$	0.63		$	0.6
	Diluted
	Continuing operations	$	0.65		$	0.63
	Discontinued operations	(0.03		)	(0.04		)
	Diluted earnings per ordinary share	$	0.62		$	0.59
	Anti-dilutive stock options excluded from the calculation of diluted earnings per share	1.2			0.5

Supplemental_Balance_Sheet_Inf

Supplemental Balance Sheet Information	3 Months Ended
	Mar. 28, 2015
Supplemental Balance Sheet Information	Supplemental Balance Sheet Information
	In millions	March 28,		December 31,
		2015		2014
	Inventories
	Raw materials and supplies	$	447.6	$	460.1
	Work-in-process	244.5		229
	Finished goods	484.9		441.3
	Total inventories	$	1,177.00	$	1,130.40
	Other current assets
	Cost in excess of billings	$	108.9	$	103.5
	Prepaid expenses	149.6		109.6
	Deferred income taxes	132.3		139.4
	Other current assets	21.7		14.3
	Total other current assets	$	412.5	$	366.8
	Property, plant and equipment, net
	Land and land improvements	$	157.3	$	165.1
	Buildings and leasehold improvements	476.1		493.5
	Machinery and equipment	1,164.00		1,169.10
	Construction in progress	69.4		71
	Total property, plant and equipment	1,866.80		1,898.70
	Accumulated depreciation and amortization	951.4		948.7
	Total property, plant and equipment, net	$	915.4	$	950
	Other non-current assets
	Asbestos-related insurance receivable	$	112.9	$	115.8
	Deferred income taxes	87.3		87.9
	Other non-current assets	220.1		232.5
	Total other non-current assets	$	420.3	$	436.2
	Other current liabilities
	Deferred revenue and customer deposits	$	124.9	$	112.7
	Dividends payable	57.5		116.8
	Billings in excess of cost	36.9		41.4
	Accrued warranty	65.2		66.4
	Other current liabilities	369.7		371.8
	Total other current liabilities	$	654.2	$	709.1
	Other non-current liabilities
	Asbestos-related liabilities	$	247.5	$	249.1
	Taxes payable	61		61.6
	Other non-current liabilities	181.9		187
	Total other non-current liabilities	$	490.4	$	497.7

Goodwill_and_Other_Identifiabl

Goodwill and Other Identifiable Intangible Assets	3 Months Ended
	Mar. 28, 2015
Goodwill and Other Identifiable Intangible Assets	Goodwill and Other Identifiable Intangible Assets
	The changes in the carrying amount of goodwill by segment were as follows:
	In millions	December 31, 2014		Acquisitions/			Foreign currency			March 28, 2015
				divestitures			translation/other
	Valves & Controls	$	1,511.60	$	—		$	—		$	1,511.60
	Flow & Filtration Solutions	942.4		—			(55.2		)	887.2
	Water Quality Systems	1,137.60		—			(14.9		)	1,122.70
	Technical Solutions	1,150.30		6.3			(6.3		)	1,150.30
	Total goodwill	$	4,741.90	$	6.3		$	(76.4	)	$	4,671.80
	Identifiable intangible assets consisted of the following:
		March 28, 2015									December 31, 2014
	In millions	Cost		Accumulated			Net				Cost			Accumulated			Net
				amortization										amortization
	Finite-life intangibles
	Customer relationships	$	1,229.20	$	(338.9	)	$	890.3			$	1,247.80		$	(325.2	)	$	922.6
	Trade names	1.9		(1.1		)	0.8				2			(1.1		)	0.9
	Proprietary technology and patents	249.6		(98.8		)	150.8				255.7			(96.7		)	159
	Total finite-life intangibles	$	1,480.70	$	(438.8	)	$	1,041.90			$	1,505.50		$	(423.0	)	$	1,082.50
	Indefinite-life intangibles
	Trade names	517.2		—			517.2				525.6			—			525.6
	Total intangibles, net	$	1,997.90	$	(438.8	)	$	1,559.10			$	2,031.10		$	(423.0	)	$	1,608.10
	Intangible asset amortization expense was $27.6 million and $28.5 million for the three months ended March 28, 2015 and March 29, 2014, respectively.
	Estimated future amortization expense for identifiable intangible assets during the remainder of 2015 and the next five years is as follows:
		Q2 - Q4
	In millions	2015		2016			2017			2018			2019			2020
	Estimated amortization expense	$	87	$	108.3		$	106.7		$	103.4		$	96.3		$	91.5

Debt

Debt	3 Months Ended
	Mar. 28, 2015
Debt	Debt
	Debt and the average interest rates on debt outstanding were as follows:
	In millions	Average	Maturity	March 28,			December 31,
		interest rate at	Year	2015			2014
		28-Mar-15
	Commercial paper	0.89%	2019	$	1,394.10		$	987.6
	Revolving credit facilities	1.43%	2019	9.3			9.8
	Senior notes - fixed rate	1.35%	2015	350			350
	Senior notes - fixed rate	1.88%	2017	350			350
	Senior notes - fixed rate	2.65%	2019	250			250
	Senior notes - fixed rate	5.00%	2021	500			500
	Senior notes - fixed rate	3.15%	2022	550			550
	Capital lease obligations	6.09%	2015	5.6			6.7
	Total debt			3,409.00			3,004.10
	Less: Current maturities and short-term borrowings			(5.6		)	(6.7		)
	Long-term debt			$	3,403.40		$	2,997.40
	Effective upon the Redomicile, the 1.35% Senior Notes due 2015, 1.875% Senior Notes due 2017, 2.65% Senior Notes due 2019, $373.0 million of the 5.00% Senior Notes due 2021 and 3.15% Senior Notes due 2022 issued by Pentair Finance S.A. ("PFSA") and $127.0 million of the 5.00% Senior Notes due 2021 issued by Pentair, Inc. (collectively, the "Notes") are guaranteed as to payment by Pentair plc and Pentair Investments Switzerland GmbH ("PISG"), a 100-percent owned subsidiary of Pentair plc and the 100-percent owner of PFSA. Prior to the Redomicile, the Notes were guaranteed as to payment by Pentair Ltd.
	Pentair, Inc. had a credit agreement providing for an unsecured, committed revolving credit facility (the "Prior Credit Facility") pursuant to which Pentair Ltd. was the guarantor and PFSA and certain other of our subsidiaries were affiliate borrowers. In October 2014, Pentair plc, PISG, PFSA and Pentair, Inc. entered into an amended and restated credit agreement related to the Prior Credit Facility (the "Amended Credit Facility"), with Pentair plc and PISG as guarantors and PFSA and Pentair, Inc. as borrowers. The Amended Credit Facility increased the maximum aggregate availability to $2,100.0 million and extended the maturity date to October 3, 2019. Borrowings under the Amended Credit Facility generally bear interest at a variable rate equal to the London Interbank Offered Rate ("LIBOR") plus a specified margin based upon PFSA's credit ratings. PFSA must pay a facility fee ranging from 9.0 to 25.0 basis points per annum (based upon PFSA's credit ratings) on the amount of each lender's commitment and letter of credit fee for each letter of credit issued and outstanding under the Amended Credit Facility.
	PFSA is authorized to sell short-term commercial paper notes to the extent availability exists under the Amended Credit Facility. PFSA uses the Amended Credit Facility as back-up liquidity to support 100% of commercial paper outstanding. As of March 28, 2015 and December 31, 2014, we had $1,394.1 million and $987.6 million, respectively, of commercial paper outstanding, all of which was classified as long-term as we have the intent and the ability to refinance such obligations on a long-term basis under the Amended Credit Facility.
	Total availability under the Amended Credit Facility was $696.6 million as of March 28, 2015, which was not limited by any covenants contained in the Amended Credit Facility’s credit agreement.
	Our debt agreements contain certain financial covenants, the most restrictive of which are in the Amended Credit Facility, including that we may not permit (i) the ratio of our consolidated debt plus synthetic lease obligations to our consolidated net income (excluding, among other things, non-cash gains and losses) before interest, taxes, depreciation, amortization, non-cash share-based compensation expense, and up to a lifetime maximum $25.0 million of costs, fees and expenses incurred in connection with certain acquisitions, investments, dispositions and the issuance, repayment or refinancing of debt, ("EBITDA") for the four consecutive fiscal quarters then ended (the "Leverage Ratio") to exceed 3.50 to 1.00 on the last day of each fiscal quarter, and (ii) the ratio of our EBITDA for the four consecutive fiscal quarters then ended to our consolidated interest expense, including consolidated yield or discount accrued as to outstanding securitization obligations (if any), for the same period to be less than 3.00 to 1.00 as of the end of each fiscal quarter. For purposes of the Leverage Ratio, the Amended 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 March 28, 2015, we were in compliance with all financial covenants in our debt agreements.
	In addition to the Amended Credit Facility, we have various other credit facilities with an aggregate availability of $65.7 million, of which none was outstanding at March 28, 2015. Borrowings under these credit facilities bear interest at variable rates.
	We have $350.0 million of fixed rate senior notes maturing in December 2015. We classified this debt as long-term as of March 28, 2015 as we have the intent and ability to refinance such obligation on a long-term basis under the Amended Credit Facility.
	Debt outstanding at March 28, 2015 matures on a calendar year basis as follows:
		Q2-Q4
	In millions	2015			2016			2017		2018		2019		2020		Thereafter		Total
	Contractual debt obligation maturities	$	—		$	—		$	350	$	—	$	2,003.40	$	—	$	1,050.00	$	3,403.40
	Capital lease obligations	5.6			—			—		—		—		—		—		5.6
	Total maturities	$	5.6		$	—		$	350	$	—	$	2,003.40	$	—	$	1,050.00	$	3,409.00
	Capital lease obligations relate primarily to land and buildings and consist of total future minimum lease payments of $5.7 million, less the imputed interest of $0.1 million as of March 28, 2015.
	As of March 28, 2015 and December 31, 2014, assets under capital lease were $18.0 million and $19.5 million, respectively, less accumulated amortization of $2.5 million and $2.4 million, respectively, all of which were included in Property, plant and equipment, net on the Condensed Consolidated Balance Sheets.

Derivatives_and_Financial_Inst

Derivatives and Financial Instruments	3 Months Ended
	Mar. 28, 2015
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 and interest rates on our floating rate indebtedness. To manage the volatility related to these exposures, we periodically enter into a variety of derivative financial instruments. Our objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows associated with changes in foreign currency rates and interest 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.
	Interest rate swaps
	In April 2011, we entered into interest rate swap contracts to hedge movement in interest rates through the expected date of a fixed rate debt offering. The swaps had a notional amount of $400.0 million with an average interest rate of 3.65%. In May 2011, upon the sale of the fixed rate debt, the swaps were terminated at a cost of $11.0 million. Because we used the contracts to hedge future interest payments, this was recorded in Accumulated other comprehensive income (loss) ("AOCI") in the Condensed Consolidated Balance Sheets and will be amortized as interest expense over the 10 year life of the underlying fixed rate debt. The ending unrealized net loss in AOCI was $6.7 million and $7.0 million at March 28, 2015 and December 31, 2014, respectively.
	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 March 28, 2015 and December 31, 2014, we had outstanding foreign currency derivative contracts with gross notional U.S. dollar equivalent amounts of $226.8 million and $250.8 million, respectively. The impact of these contracts on the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) is not material for any period presented.
	Gains or losses on foreign currency contracts designated as hedges are reclassified out of AOCI and into Selling, general and administrative expense in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) upon settlement. Such reclassifications during the three months ended March 28, 2015 and March 29, 2014 were not material.
	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; and
	•	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.
	The recorded amounts and estimated fair values of total debt were as follows:
		March 28, 2015						December 31, 2014
	In millions	Recorded		Fair				Recorded			Fair
		Amount		Value				Amount			Value
	Variable rate debt	$	1,403.40	$	1,403.40			$	997.4		$	997.4
	Fixed rate debt	2,005.60		2,090.70				2,006.70			2,070.40
	Total debt	$	3,409.00	$	3,494.10			$	3,004.10		$	3,067.80
	Financial assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows:
		March 28, 2015
	In millions	Level 1		Level 2			Level 3			Total
	Recurring fair value measurements
	Foreign currency contract liabilities	$	—	$	(6.7	)	$	—		$	(6.7	)
	Deferred compensation plans (1)	45.1		7.4			—			52.5
	Total recurring fair value measurements	$	45.1	$	0.7		$	—		$	45.8
		December 31, 2014
	In millions	Level 1		Level 2			Level 3			Total
	Recurring fair value measurements
	Foreign currency contract assets	$	—	$	0.9		$	—		$	0.9
	Foreign currency contract liabilities	—		(6.6		)	—			(6.6		)
	Deferred compensation plan (1)	47.9		7.4			—			55.3
	Total recurring fair value measurements	$	47.9	$	1.7		$	—		$	49.6
	Nonrecurring fair value measurements (2)
	-1	Deferred compensation plan assets include mutual funds, common/collective trusts and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees. The fair value of mutual funds and cash equivalents were based on quoted market prices in active markets. The underlying investments in the common/collective trusts primarily include intermediate and long-term debt securities, corporate debt securities, equity securities and fixed income securities. The overall fair value of the common/collective trusts are based on observable inputs.
	-2	During the third quarter of 2014, we recognized an impairment charge related to allocated amounts of goodwill, intangible assets, property, plant & equipment and other non-current assets totaling $380.1 million, net of a $12.3 million tax benefit, representing our estimated loss on disposal of the Water Transport business. The impairment charge was determined using significant unobservable inputs (Level 3 fair value measurements).

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 28, 2015
Income Taxes	Income Taxes
	We manage our affairs so that we are centrally managed and controlled in the U.K. and therefore have our tax residency in the U.K. The provision for income taxes consists of provisions for 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 three months ended March 28, 2015 was 23.0% compared to 24.5% for the three months ended March 29, 2014. 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 $60.4 million and $62.1 million at March 28, 2015 and December 31, 2014, respectively. 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 (Loss), which is consistent with our past practices.

Benefit_Plans

Benefit Plans	3 Months Ended
	Mar. 28, 2015
Benefit Plans	Benefit Plans
	Components of net periodic benefit cost for our pension plans for the three months ended March 28, 2015 and March 29, 2014 were as follows:
		U.S. pension plans
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Service cost	$	3.5		$	3.3
	Interest cost	3.7			3.8
	Expected return on plan assets	(2.5		)	(2.6		)
	Net periodic benefit cost	$	4.7		$	4.5
		Non-U.S. pension plans
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Service cost	$	2.6		$	2
	Interest cost	3.8			4.7
	Expected return on plan assets	(4.1		)	(4.2		)
	Net periodic benefit cost	$	2.3		$	2.5
	Components of net periodic benefit cost for our other post-retirement plans for the three months ended March 28, 2015 and March 29, 2014 were not material.

Shareholders_Equity

Shareholders' Equity	3 Months Ended
	Mar. 28, 2015
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 authorization expires on December 31, 2019. During the three months ended March 28, 2015, we repurchased 3.1 million of our shares for $200.0 million pursuant to this authorization. As of March 28, 2015, we had $800.0 million remaining available for share repurchases under this authorization.
	Dividends payable
	At our 2014 annual meeting of shareholders held on May 20, 2014, our shareholders approved a proposal to pay quarterly cash dividends through the second quarter of 2015. The authorization provides that dividends of $1.20 per share will be paid to our shareholders in quarterly installments of $0.30 for each of the third and fourth quarters of 2014 and the first and second quarters of 2015. In December 2014, the Board of Directors approved an increase of $0.02 per share for the first and second quarter 2015 dividends, bringing the total quarterly dividend for those quarters to $0.32 per share. As a result, the balance of dividends payable included in Other current liabilities on our Condensed Consolidated Balance Sheets was $57.5 million and $116.8 million at March 28, 2015 and December 31, 2014, respectively.

Segment_Information

Segment Information	3 Months Ended
	Mar. 28, 2015
Segment Information	Segment information
	During the first quarter of 2015, we reorganized our business segments to reflect a new operating structure and management of our Global Business Units, resulting in a change to our reporting segments in 2015.
	Financial information by reportable segment is as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Net sales
	Valves & Controls	$	429.2		$	531
	Flow & Filtration Solutions	350.1			401.1
	Water Quality Systems	306.9			304
	Technical Solutions	395.8			415.3
	Other	(7.0		)	(7.4		)
	Consolidated	$	1,475.00		$	1,644.00
	Segment income (loss)
	Valves & Controls	$	42		$	60.9
	Flow & Filtration Solutions	29.1			34.7
	Water Quality Systems	49.3			47.7
	Technical Solutions	72.7			79
	Other	(21.9		)	(21.7		)
	Consolidated	$	171.2		$	200.6
	The following table presents a reconciliation of consolidated segment income to consolidated operating income:
	In millions	March 28,			March 29,
		2015			2014
	Segment income	$	171.2		$	200.6
	Restructuring and other	—			(17.0		)
	Redomicile related expenses	—			(1.5		)
	Operating income	$	171.2		$	182.1

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 28, 2015
Commitments and Contingencies	Commitments and Contingencies
	Asbestos Matters
	Our subsidiaries and numerous other companies are named as defendants in personal injury lawsuits based on alleged exposure to asbestos-containing materials. These cases typically involve product liability claims based primarily on allegations of manufacture, sale or distribution of industrial products that either contained asbestos or were attached to or used with asbestos-containing components manufactured by third-parties. Each case typically names between dozens to hundreds of corporate defendants. While we have observed an increase in the number of these lawsuits over the past several years, including lawsuits by plaintiffs with mesothelioma-related claims, a large percentage of these suits have not presented viable legal claims and, as a result, have been dismissed by the courts. Our historical strategy has been to mount a vigorous defense aimed at having unsubstantiated suits dismissed, and, where appropriate, settling suits before trial. Although a large percentage of litigated suits have been dismissed, we cannot predict the extent to which we will be successful in resolving lawsuits in the future.
	As of March 28, 2015, there were approximately 3,500 claims outstanding against our subsidiaries. This amount includes adjustments for claims that are not actively being prosecuted. This amount is not adjusted for claims that identify incorrect defendants or duplicate other actions. In addition, the amount does not include certain claims pending against third parties for which we have been provided an indemnification.
	Periodically, we perform an analysis with the assistance of outside counsel and other experts to update our estimated asbestos-related assets and liabilities. Our estimate of the liability and corresponding insurance recovery for pending and future claims and defense costs is based on our historical claim experience and estimates of the number and resolution cost of potential future claims that may be filed. Our legal strategy for resolving claims also impacts these estimates.
	Our estimate of asbestos-related insurance recoveries represents estimated amounts due to us for previously paid and settled claims and the probable reimbursements relating to our estimated liability for pending and future claims. In determining the amount of insurance recoverable, we consider a number of factors, including available insurance, allocation methodologies and the solvency and creditworthiness of insurers.
	Our estimated liability for asbestos-related claims was $247.5 million and $249.1 million as of March 28, 2015 and December 31, 2014, respectively, and was recorded in Other non-current liabilities in the Condensed Consolidated Balance Sheets for pending and future claims and related defense costs. Our estimated receivable for insurance recoveries was $112.9 million and $115.8 million as of March 28, 2015 and December 31, 2014, respectively, and was recorded in Other non-current assets in the Condensed Consolidated Balance Sheets.
	The amounts recorded by us for asbestos-related liabilities and insurance-related assets are based on our strategies for resolving our asbestos claims and currently available information as well as estimates and assumptions. Key variables and assumptions include the number and type of new claims filed each year, the average cost of resolution of claims, the resolution of coverage issues with insurance carriers, the amounts of insurance and the related solvency risk with respect to our insurance carriers, and the indemnifications we have provided to and received from third parties. Furthermore, predictions with respect to these variables are subject to greater uncertainty in the latter portion of the projection period. Other factors that may affect our liability and cash payments for asbestos-related matters include uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, reforms of state or federal tort legislation and the applicability of insurance policies among subsidiaries. As a result, actual liabilities or insurance recoveries could be significantly higher or lower than those recorded if assumptions used in our calculations vary significantly from actual results.
	Environmental Matters
	We are involved in or have retained responsibility and potential liability for environmental obligations and legal proceedings related to our current business and, including pursuant to certain indemnification obligations, related to certain formerly owned businesses. Our accruals for environmental matters are recorded on a site-by-site basis when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based on current law and existing technologies. Based upon our experience, current information regarding known contingencies and applicable laws, we have recorded reserves for these environmental matters of $23.7 million and $31.4 million as of March 28, 2015 and December 31, 2014, respectively. We do not anticipate these environmental conditions will have a material adverse effect on our financial position, results of operations or cash flows.
	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 condition or results of operations.
	We recognize, at the inception of a guarantee, a liability for the fair value of the obligation undertaken in issuing the guarantee.
	We provide service and warranty policies on our products. Liability under service and warranty policies is based upon a review of historical warranty and service claim experience. Adjustments are made to accruals as claim data and historical experience warrant.
	The changes in the carrying amount of service and product warranties for the three months ended March 28, 2015 were as follows:
	In millions	March 28,
		2015
	Beginning balance	$	66.4
	Service and product warranty provision	13.8
	Payments	(13.2		)
	Foreign currency translation	(1.8		)
	Ending balance	$	65.2
	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 Pentair Ltd. In situations where Flow Control and Tyco were unable to obtain a release from these guarantees in connection with the spin-off of Pentair Ltd., 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 March 28, 2015 and December 31, 2014, the outstanding value of bonds, letters of credit and bank guarantees totaled $386.1 million and $370.1 million, respectively, of which $26.2 million and $32.4 million, respectively, relate to the Water Transport business.

Financial_Statements_of_Parent

Financial Statements of Parent Company Guarantor	3 Months Ended
	Mar. 28, 2015
Financial Statements of Parent Company Guarantor	Effective upon the Redomicile, Pentair plc (the "Parent Company Guarantor") and Pentair Investments Switzerland GmbH (the "Subsidiary Guarantor"), fully and unconditionally, guarantee the Notes of Pentair Finance S.A. (the "Subsidiary Issuer"). The Subsidiary Guarantor is a Switzerland limited liability company formed in April 2014 and 100 percent-owned subsidiary of the Parent Company Guarantor. The Subsidiary Issuer is a Luxembourg public limited liability company 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 Pentair Investments Switzerland GmbH as the guarantors, Pentair Finance S.A. as issuer of the debt and all other non-guarantor subsidiaries. Condensed consolidating financial information for Pentair plc, Pentair Investments Switzerland GmbH and Pentair Finance S.A. on a stand-alone basis is presented using the equity method of accounting for subsidiaries.
	Prior to the Redomicile, the Notes of the Subsidiary Issuer were guaranteed, fully and unconditionally, by the former parent company, Pentair Ltd. The supplemental financial information for reporting periods prior to the Redomicile are presented under this previous guarantee structure.
	Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
	Three months ended March 28, 2015
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Net sales	$	—		$	—		$	—		$	1,475.00		$	—		$	1,475.00
	Cost of goods sold	—			—			—			964.8			—			964.8
	Gross profit	—			—			—			510.2			—			510.2
	Selling, general and administrative	3.1			0.1			1.1			304.9			—			309.2
	Research and development	—			—			—			29.8			—			29.8
	Operating income (loss)	(3.1		)	(0.1		)	(1.1		)	175.5			—			171.2
	Loss (earnings) from continuing operations of investment in subsidiaries	(120.7		)	(121.7		)	(118.5		)	—			360.9			—
	Other (income) expense:
	Equity income of unconsolidated subsidiaries	—			—			—			(0.5		)	—			(0.5		)
	Net interest expense	—			0.9			3.5			13.8			—			18.2
	Income (loss) from continuing operations before income taxes	117.6			120.7			113.9			162.2			(360.9		)	153.5
	Provision (benefit) for income taxes	(0.6		)	—			—			35.9			—			35.3
	Net income (loss) from continuing operations	118.2			120.7			113.9			126.3			(360.9		)	118.2
	Loss from discontinued operations, net of tax	—			—			—			(4.3		)	—			(4.3		)
	Earnings (loss) from discontinued operations of investment in subsidiaries	(4.3		)	(4.3		)	(4.3		)	—			12.9			—
	Net income (loss)	$	113.9		$	116.4		$	109.6		$	122		$	(348.0	)	$	113.9
	Comprehensive income (loss), net of tax
	Net income (loss)	$	113.9		$	116.4		$	109.6		$	122		$	(348.0	)	$	113.9
	Changes in cumulative translation adjustment	(174.2		)	(174.2		)	(174.2		)	(174.2		)	522.6			(174.2		)
	Changes in market value of derivative financial instruments	(0.1		)	(0.1		)	(0.1		)	(0.1		)	0.3			(0.1		)
	Comprehensive income (loss)	$	(60.4	)	$	(57.9	)	$	(64.7	)	$	(52.3	)	$	174.9		$	(60.4	)
	Consolidating Balance Sheet
	March 28, 2015
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	—		$	0.2		$	130.9		$	—		$	131.1
	Accounts and notes receivable, net	—			—			—			1,247.50			—			1,247.50
	Inventories	—			—			—			1,177.00			—			1,177.00
	Other current assets	1.5			15.7			6.5			416.5			(27.7		)	412.5
	Current assets held for sale	—			—			—			8.8			—			8.8
	Total current assets	1.5			15.7			6.7			2,980.70			(27.7		)	2,976.90
	Property, plant and equipment, net	—			—			—			915.4			—			915.4
	Other assets
	Investments in subsidiaries	4,663.30			4,825.10			7,448.90			—			(16,937.3		)	—
	Goodwill	—			—			—			4,671.80			—			4,671.80
	Intangibles, net	—			—			—			1,559.10			—			1,559.10
	Other non-current assets	115.2			—			2,008.60			294.7			(1,998.2		)	420.3
	Non-current assets held for sale	—			—			—			25.9			—			25.9
	Total other assets	4,778.50			4,825.10			9,457.50			6,551.50			(18,935.5		)	6,677.10
	Total assets	$	4,780.00		$	4,840.80		$	9,464.20		$	10,447.60		$	(18,963.2	)	$	10,569.40
	Liabilities and Equity
	Current liabilities
	Current maturities of long-term debt and short-term borrowings	$	—		$	—		$	—		$	5.6		$	—		$	5.6
	Accounts payable	0.3			—			—			504.6			—			504.9
	Employee compensation and benefits	0.5			0.1			—			254.3			—			254.9
	Other current liabilities	64.5			1.6			13.3			602.5			(27.7		)	654.2
	Current liabilities held for sale	—			—			—			11.5			—			11.5
	Total current liabilities	65.3			1.7			13.3			1,378.50			(27.7		)	1,431.10
	Other liabilities
	Long-term debt	276.4			175.8			3,267.10			1,682.30			(1,998.2		)	3,403.40
	Pension and other post-retirement compensation and benefits	—			—			—			300.9			—			300.9
	Deferred tax liabilities	—			—			2.9			513.4			—			516.3
	Other non-current liabilities	15			—			—			475.4			—			490.4
Non-current liabilities held for sale	—			—			—			4			—			4
Total liabilities	356.7			177.5			3,283.30			4,354.50			(2,025.9		)	6,146.10
Equity	4,423.30			4,663.30			6,180.90			6,093.10			(16,937.3		)	4,423.30
Total liabilities and equity	$	4,780.00		$	4,840.80		$	9,464.20		$	10,447.60		$	(18,963.2	)	$	10,569.40
Consolidating Statement of Cash Flows
Three months ended March 28, 2015
In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
	Company						Issuer			Subsidiaries
	Guarantor
Operating activities
Net cash provided by (used for) operating activities	$	79.5		$	102.4		$	107.9		$	(75.0	)	$	(348.0	)	$	(133.2	)
Investing activities
Capital expenditures	—			—			—			(34.8		)	—			(34.8		)
Proceeds from sale of property and equipment	—			—			—			2.3			—			2.3
Acquisitions, net of cash acquired	—			—			—			(3.0		)	—			(3.0		)
Net intercompany loan activity	—			—			(468.5		)	163.4			305.1			—
Net cash provided by (used for) investing activities of continuing operations	—			—			(468.5		)	127.9			305.1			(35.5		)
Net cash provided by (used for) investing activities of discontinued operations	—			—			—			54.9			—			54.9
Net cash provided by (used for) investing activities	—			—			(468.5		)	182.8			305.1			19.4
Financing activities
Net receipts (repayments) of commercial paper and revolving long-term debt	—			—			406.5			(0.5		)	—			406
Repayments of long-term debt	—			—			—			(0.4		)	—			(0.4		)
Net change in advances to subsidiaries	178			(102.4		)	(45.8		)	(72.7		)	42.9			—
Excess tax benefits from share-based compensation	—			—			—			2.8			—			2.8
Shares issued to employees, net of shares withheld	—			—			—			8.7			—			8.7
Repurchases of ordinary shares	(200.0		)	—			—			—			—			(200.0		)
Dividends paid	(57.5		)	—			—			—			—			(57.5		)
Net cash provided by (used for) financing activities	(79.5		)	(102.4		)	360.7			(62.1		)	42.9			159.6
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(25.1		)	—			(25.1		)
Change in cash and cash equivalents	—			—			0.1			20.6			—			20.7
Cash and cash equivalents, beginning of period	—			—			0.1			110.3			—			110.4
Cash and cash equivalents, end of period	$	—		$	—		$	0.2		$	130.9		$	—		$	131.1
Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Three months ended March 29, 2014
In millions	Parent			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
	Company			Issuer			Subsidiaries
	Guarantor
Net sales	$	—		$	—		$	1,644.00		$	—		$	1,644.00
Cost of goods sold	—			—			1,079.90			—			1,079.90
Gross profit	—			—			564.1			—			564.1
Selling, general and administrative	(0.3		)	3.3			349.5			—			352.5
Research and development	—			—			29.5			—			29.5
Operating income (loss)	0.3			(3.3		)	185.1			—			182.1
Loss (earnings) from continuing operations of investment in subsidiaries	(125.5		)	(134.0		)	—			259.5			—
Other (income) expense:
Equity income of unconsolidated subsidiaries	—			—			(0.3		)	—			(0.3		)
Net interest expense	0.3			0.9			14.9			—			16.1
Income (loss) from continuing operations before income taxes	125.5			129.8			170.5			(259.5		)	166.3
Provision for income taxes	—			—			40.8			—			40.8
Net income (loss) from continuing operations	125.5			129.8			129.7			(259.5		)	125.5
Loss from discontinued operations, net of tax	—			—			(1.3		)	—			(1.3		)
Loss from sale of discontinued operations, net of tax	—			—			(5.6		)	—			(5.6		)
Earnings (loss) from discontinued operations of investment in subsidiaries	(6.9		)	(6.9		)	—			13.8			—
Net income (loss)	$	118.6		$	122.9		$	122.8		$	(245.7	)	$	118.6
Comprehensive income (loss), net of tax
Net income (loss)	$	118.6		$	122.9		$	122.8		$	(245.7	)	$	118.6
Changes in cumulative translation adjustment	(27.9		)	(27.9		)	(27.9		)	55.8			(27.9		)
Changes in market value of derivative financial instruments	0.2			0.2			0.2			(0.4		)	0.2
Comprehensive income (loss)	$	90.9		$	95.2		$	95.1		$	(190.3	)	$	90.9
Consolidating Balance Sheet
December 31, 2014
In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
	Company						Issuer			Subsidiaries
	Guarantor
Assets
Current assets
Cash and cash equivalents	$	—		$	—		$	0.1		$	110.3		$	—		$	110.4
Accounts and notes receivable, net	—			—			—			1,206.80			(0.9		)	1,205.90
Inventories	—			—			—			1,130.40			—			1,130.40
Other current assets	—			17.6			2			367.6			(20.4		)	366.8
Current assets held for sale	—			—			—			80.6			—			80.6
Total current assets	—			17.6			2.1			2,895.70			(21.3		)	2,894.10
Property, plant and equipment, net	—			—			—			950			—			950
Other assets
Investments in subsidiaries	4,733.00			4,893.80			7,612.20			—			(17,239.0		)	—
Goodwill	—			—			—			4,741.90			—			4,741.90
Intangibles, net	—			—			—			1,608.10			—			1,608.10
Other non-current assets	80.2			—			1,381.80			345			(1,370.8		)	436.2
Non-current assets held for sale	—			—			—			24.9			—			24.9
Total other assets	4,813.20			4,893.80			8,994.00			6,719.90			(18,609.8		)	6,811.10
Total assets	$	4,813.20		$	4,911.40		$	8,996.10		$	10,565.60		$	(18,631.1	)	$	10,655.20
Liabilities and Equity
Current liabilities
Current maturities of long-term debt and short-term borrowings	$	—		$	—		$	—		$	6.7		$	—		$	6.7
Accounts payable	0.9			—			—			583.1			(0.9		)	583.1
Employee compensation and benefits	0.2			0.6			—			304.7			—			305.5
Other current liabilities	120.6			2.2			10.9			595.8			(20.4		)	709.1
Current liabilities held for sale	—			—			—			35.1			—			35.1
Total current liabilities	121.7			2.8			10.9			1,525.40			(21.3		)	1,639.50
Other liabilities
Long-term debt	11.4			175.6			2,860.60			1,320.60			(1,370.8		)	2,997.40
Pension and other post-retirement compensation and benefits	—			—			—			322			—			322
Deferred tax liabilities	—			—			2.9			525.4			—			528.3
Other non-current liabilities	16.3			—			—			481.4			—			497.7
Non-current liabilities held for sale	—			—			—			6.5			—			6.5
Total liabilities	149.4			178.4			2,874.40			4,181.30			(1,392.1		)	5,991.40
Equity	4,663.80			4,733.00			6,121.70			6,384.30			(17,239.0		)	4,663.80
Total liabilities and equity	$	4,813.20		$	4,911.40		$	8,996.10		$	10,565.60		$	(18,631.1	)	$	10,655.20
Consolidating Statement of Cash Flows
Three months ended March 29, 2014
In millions	Parent			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
	Company			Issuer			Subsidiaries
	Guarantor
Operating activities
Net cash provided by (used for) operating activities	$	118		$	125.6		$	4.6		$	(245.7	)	$	2.5
Investing activities
Capital expenditures	—			—			(27.2		)	—			(27.2		)
Proceeds from sale of property and equipment	—			—			0.4			—			0.4
Other	—			—			(0.5		)	—			(0.5		)
Net cash provided by (used for) investing activities	—			—			(27.3		)	—			(27.3		)
Financing activities
Net receipts of short-term borrowings	—			—			0.3			—			0.3
Net receipts of commercial paper and revolving long-term debt	—			367.4			14.5			—			381.9
Repayments of long-term debt	—			—			(0.9		)	—			(0.9		)
Excess tax benefits from share-based compensation	—			—			6.1			—			6.1
Net change in advances to subsidiaries	(69.1		)	(539.6		)	363			245.7			—
Shares issued to employees, net of shares withheld	—			—			24			—			24
Repurchases of ordinary shares	—			—			(252.2		)	—			(252.2		)
Dividends paid	(49.2		)	—			—			—			(49.2		)
Purchase of noncontrolling interest	—			—			(134.7		)	—			(134.7		)
Net cash provided by (used for) financing activities	(118.3		)	(172.2		)	20.1			245.7			(24.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(2.6		)	—			(2.6		)
Change in cash and cash equivalents	(0.3		)	(46.6		)	(5.2		)	—			(52.1		)
Cash and cash equivalents, beginning of period	0.5			47			208.5			—			256
Cash and cash equivalents, end of period	$	0.2		$	0.4		$	203.3		$	—		$	203.9

Discontinued_Operations_and_Di1

Discontinued Operations and Divestitures (Tables)	3 Months Ended
	Mar. 28, 2015
Business Combinations [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Net sales	$	18.6		$	82.6
	Cost of goods sold	18.1			68.4
	Gross profit	$	0.5		$	14.2
	Loss from discontinued operations before income taxes	$	(5.6	)	$	(1.7	)
	Income tax benefit	1.3			0.4
	Loss from discontinued operations, net of tax	$	(4.3	)	$	(1.3	)
	Loss from sale / impairment of discontinued operations before income taxes	$	—		$	(8.0	)
	Income tax benefit	—			2.4
	Loss from sale / impairment of discontinued operations, net of tax	$	—		$	(5.6	)
	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	March 28,			December 31,
		2015			2014
	Cash and cash equivalents	$	0.2		$	7
	Accounts and notes receivable, net	1.6			28.8
	Inventories	—			30.1
	Other current assets	7			14.7
	Current assets held for sale	$	8.8		$	80.6
	Property, plant and equipment, net	$	18		$	18.5
	Other non-current assets	7.9			6.4
	Non-current assets held for sale	$	25.9		$	24.9
	Accounts payable	2.1			12.2
	Employee compensation and benefits	4.1			11.3
	Other current liabilities	5.3			11.6
	Current liabilities held for sale	$	11.5		$	35.1
	Long-term debt	$	3.9		$	4
	Pension and other post-retirement compensation and benefits	0.1			2.5
	Non-current liabilities held for sale	$	4		$	6.5

Share_Plans_Tables

Share Plans (Tables)	3 Months Ended
	Mar. 28, 2015
Share-based Compensation Expense	Total share-based compensation expense for the three months ended March 28, 2015 and March 29, 2014 was as follows:
		Three months ended
	In millions	March 28,		March 29,
		2015		2014
	Restricted stock units	$	6.2	$	4.9
	Stock options	3.5		2.5
	Total share-based compensation expense	$	9.7	$	7.4
Assumptions Used in Calculating Estimated Fair Value of Stock Option Award	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:
		2015
		Annual Grant
	Risk-free interest rate	1.61	%
	Expected dividend yield	1.96	%
	Expected share price volatility	30.4	%
	Expected term (years)	6

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Mar. 28, 2015
Restructuring Related Costs	Restructuring related costs included in Selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) included costs for severance and other restructuring costs as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Severance and related costs	$	—		$	13.4
	Other	—			4
	Total restructuring costs	$	—		$	17.4
Restructuring Costs By Segment [Table Text Block]	Restructuring costs by reportable segment for the three months ended March 28, 2015 and March 29, 2014 were as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Valves & Controls	$	—		$	9.8
	Flow & Filtration Solutions	—			4.7
	Water Quality Systems	—			0.3
	Technical Solutions	—			2.6
	Consolidated	$	—		$	17.4
Restructuring Accrual Activity Recorded on Consolidated Balance Sheets	Activity in the restructuring accrual recorded in Other current liabilities and Employee compensation and benefits in the Condensed Consolidated Balance Sheets is summarized as follows for the three months ended March 28, 2015:
	In millions	March 28,
		2015
	Beginning balance	$	73.4
	Cash payments and other	(12.5		)
	Ending balance	$	60.9

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 28, 2015
Basic and Diluted Earnings Per Share	Basic and diluted earnings per share were calculated as follows:
		Three months ended
	In millions, except per-share data	March 28,			March 29,
		2015			2014
	Net income	$	113.9		$	118.6
	Net income from continuing operations	$	118.2		$	125.5
	Weighted average ordinary shares outstanding
	Basic	180.1			196.2
	Dilutive impact of stock options and restricted stock units	2.6			3.5
	Diluted	182.7			199.7
	Earnings (loss) per ordinary share
	Basic
	Continuing operations	$	0.66		$	0.64
	Discontinued operations	(0.03		)	(0.04		)
	Basic earnings per ordinary share	$	0.63		$	0.6
	Diluted
	Continuing operations	$	0.65		$	0.63
	Discontinued operations	(0.03		)	(0.04		)
	Diluted earnings per ordinary share	$	0.62		$	0.59
	Anti-dilutive stock options excluded from the calculation of diluted earnings per share	1.2			0.5

Supplemental_Balance_Sheet_Inf1

Supplemental Balance Sheet Information (Tables)	3 Months Ended
	Mar. 28, 2015
Supplemental Balance Sheet Information
	In millions	March 28,		December 31,
		2015		2014
	Inventories
	Raw materials and supplies	$	447.6	$	460.1
	Work-in-process	244.5		229
	Finished goods	484.9		441.3
	Total inventories	$	1,177.00	$	1,130.40
	Other current assets
	Cost in excess of billings	$	108.9	$	103.5
	Prepaid expenses	149.6		109.6
	Deferred income taxes	132.3		139.4
	Other current assets	21.7		14.3
	Total other current assets	$	412.5	$	366.8
	Property, plant and equipment, net
	Land and land improvements	$	157.3	$	165.1
	Buildings and leasehold improvements	476.1		493.5
	Machinery and equipment	1,164.00		1,169.10
	Construction in progress	69.4		71
	Total property, plant and equipment	1,866.80		1,898.70
	Accumulated depreciation and amortization	951.4		948.7
	Total property, plant and equipment, net	$	915.4	$	950
	Other non-current assets
	Asbestos-related insurance receivable	$	112.9	$	115.8
	Deferred income taxes	87.3		87.9
	Other non-current assets	220.1		232.5
	Total other non-current assets	$	420.3	$	436.2
	Other current liabilities
	Deferred revenue and customer deposits	$	124.9	$	112.7
	Dividends payable	57.5		116.8
	Billings in excess of cost	36.9		41.4
	Accrued warranty	65.2		66.4
	Other current liabilities	369.7		371.8
	Total other current liabilities	$	654.2	$	709.1
	Other non-current liabilities
	Asbestos-related liabilities	$	247.5	$	249.1
	Taxes payable	61		61.6
	Other non-current liabilities	181.9		187
	Total other non-current liabilities	$	490.4	$	497.7

Goodwill_and_Other_Identifiabl1

Goodwill and Other Identifiable Intangible Assets (Tables)	3 Months Ended
	Mar. 28, 2015
Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by segment were as follows:
	In millions	December 31, 2014		Acquisitions/			Foreign currency			March 28, 2015
				divestitures			translation/other
	Valves & Controls	$	1,511.60	$	—		$	—		$	1,511.60
	Flow & Filtration Solutions	942.4		—			(55.2		)	887.2
	Water Quality Systems	1,137.60		—			(14.9		)	1,122.70
	Technical Solutions	1,150.30		6.3			(6.3		)	1,150.30
	Total goodwill	$	4,741.90	$	6.3		$	(76.4	)	$	4,671.80
Detail of Identifiable Intangible Assets	Identifiable intangible assets consisted of the following:
		March 28, 2015									December 31, 2014
	In millions	Cost		Accumulated			Net				Cost			Accumulated			Net
				amortization										amortization
	Finite-life intangibles
	Customer relationships	$	1,229.20	$	(338.9	)	$	890.3			$	1,247.80		$	(325.2	)	$	922.6
	Trade names	1.9		(1.1		)	0.8				2			(1.1		)	0.9
	Proprietary technology and patents	249.6		(98.8		)	150.8				255.7			(96.7		)	159
	Total finite-life intangibles	$	1,480.70	$	(438.8	)	$	1,041.90			$	1,505.50		$	(423.0	)	$	1,082.50
	Indefinite-life intangibles
	Trade names	517.2		—			517.2				525.6			—			525.6
	Total intangibles, net	$	1,997.90	$	(438.8	)	$	1,559.10			$	2,031.10		$	(423.0	)	$	1,608.10
Estimated Future Amortization Expense for Identifiable Intangible Assets	Estimated future amortization expense for identifiable intangible assets during the remainder of 2015 and the next five years is as follows:
		Q2 - Q4
	In millions	2015		2016			2017			2018			2019			2020
	Estimated amortization expense	$	87	$	108.3		$	106.7		$	103.4		$	96.3		$	91.5

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 28, 2015
Debt and Average Interest Rates on Debt Outstanding	Debt and the average interest rates on debt outstanding were as follows:
	In millions	Average	Maturity	March 28,			December 31,
		interest rate at	Year	2015			2014
		28-Mar-15
	Commercial paper	0.89%	2019	$	1,394.10		$	987.6
	Revolving credit facilities	1.43%	2019	9.3			9.8
	Senior notes - fixed rate	1.35%	2015	350			350
	Senior notes - fixed rate	1.88%	2017	350			350
	Senior notes - fixed rate	2.65%	2019	250			250
	Senior notes - fixed rate	5.00%	2021	500			500
	Senior notes - fixed rate	3.15%	2022	550			550
	Capital lease obligations	6.09%	2015	5.6			6.7
	Total debt			3,409.00			3,004.10
	Less: Current maturities and short-term borrowings			(5.6		)	(6.7		)
	Long-term debt			$	3,403.40		$	2,997.40
Debt Outstanding Matures on Calendar Year Basis	Debt outstanding at March 28, 2015 matures on a calendar year basis as follows:
		Q2-Q4
	In millions	2015			2016			2017		2018		2019		2020		Thereafter		Total
	Contractual debt obligation maturities	$	—		$	—		$	350	$	—	$	2,003.40	$	—	$	1,050.00	$	3,403.40
	Capital lease obligations	5.6			—			—		—		—		—		—		5.6
	Total maturities	$	5.6		$	—		$	350	$	—	$	2,003.40	$	—	$	1,050.00	$	3,409.00

Derivatives_and_Financial_Inst1

Derivatives and Financial Instruments (Tables)	3 Months Ended
	Mar. 28, 2015
Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments	The recorded amounts and estimated fair values of total debt were as follows:
		March 28, 2015						December 31, 2014
	In millions	Recorded		Fair				Recorded			Fair
		Amount		Value				Amount			Value
	Variable rate debt	$	1,403.40	$	1,403.40			$	997.4		$	997.4
	Fixed rate debt	2,005.60		2,090.70				2,006.70			2,070.40
	Total debt	$	3,409.00	$	3,494.10			$	3,004.10		$	3,067.80
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:
		March 28, 2015
	In millions	Level 1		Level 2			Level 3			Total
	Recurring fair value measurements
	Foreign currency contract liabilities	$	—	$	(6.7	)	$	—		$	(6.7	)
	Deferred compensation plans (1)	45.1		7.4			—			52.5
	Total recurring fair value measurements	$	45.1	$	0.7		$	—		$	45.8
		December 31, 2014
	In millions	Level 1		Level 2			Level 3			Total
	Recurring fair value measurements
	Foreign currency contract assets	$	—	$	0.9		$	—		$	0.9
	Foreign currency contract liabilities	—		(6.6		)	—			(6.6		)
	Deferred compensation plan (1)	47.9		7.4			—			55.3
	Total recurring fair value measurements	$	47.9	$	1.7		$	—		$	49.6
	Nonrecurring fair value measurements (2)
	-1	Deferred compensation plan assets include mutual funds, common/collective trusts and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees. The fair value of mutual funds and cash equivalents were based on quoted market prices in active markets. The underlying investments in the common/collective trusts primarily include intermediate and long-term debt securities, corporate debt securities, equity securities and fixed income securities. The overall fair value of the common/collective trusts are based on observable inputs.
	-2	During the third quarter of 2014, we recognized an impairment charge related to allocated amounts of goodwill, intangible assets, property, plant & equipment and other non-current assets totaling $380.1 million, net of a $12.3 million tax benefit, representing our estimated loss on disposal of the Water Transport business. The impairment charge was determined using significant unobservable inputs (Level 3 fair value measurements).

Benefit_Plans_Tables

Benefit Plans (Tables)	3 Months Ended
	Mar. 28, 2015
Schedule of Net Benefit Costs
		U.S. pension plans
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Service cost	$	3.5		$	3.3
	Interest cost	3.7			3.8
	Expected return on plan assets	(2.5		)	(2.6		)
	Net periodic benefit cost	$	4.7		$	4.5
		Non-U.S. pension plans
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Service cost	$	2.6		$	2
	Interest cost	3.8			4.7
	Expected return on plan assets	(4.1		)	(4.2		)
	Net periodic benefit cost	$	2.3		$	2.5

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 28, 2015
Financial Information by Reportable Segment	Financial information by reportable segment is as follows:
		Three months ended
	In millions	March 28,			March 29,
		2015			2014
	Net sales
	Valves & Controls	$	429.2		$	531
	Flow & Filtration Solutions	350.1			401.1
	Water Quality Systems	306.9			304
	Technical Solutions	395.8			415.3
	Other	(7.0		)	(7.4		)
	Consolidated	$	1,475.00		$	1,644.00
	Segment income (loss)
	Valves & Controls	$	42		$	60.9
	Flow & Filtration Solutions	29.1			34.7
	Water Quality Systems	49.3			47.7
	Technical Solutions	72.7			79
	Other	(21.9		)	(21.7		)
	Consolidated	$	171.2		$	200.6
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	The following table presents a reconciliation of consolidated segment income to consolidated operating income:
	In millions	March 28,			March 29,
		2015			2014
	Segment income	$	171.2		$	200.6
	Restructuring and other	—			(17.0		)
	Redomicile related expenses	—			(1.5		)
	Operating income	$	171.2		$	182.1

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 28, 2015
Changes in Carrying Amount of Service and Product Warranties	The changes in the carrying amount of service and product warranties for the three months ended March 28, 2015 were as follows:
	In millions	March 28,
		2015
	Beginning balance	$	66.4
	Service and product warranty provision	13.8
	Payments	(13.2		)
	Foreign currency translation	(1.8		)
	Ending balance	$	65.2

Financial_Statements_of_Parent1

Financial Statements of Parent Company Guarantor (Tables)	3 Months Ended
	Mar. 28, 2015
Schedule of Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)	Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
	Three months ended March 28, 2015
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Net sales	$	—		$	—		$	—		$	1,475.00		$	—		$	1,475.00
	Cost of goods sold	—			—			—			964.8			—			964.8
	Gross profit	—			—			—			510.2			—			510.2
	Selling, general and administrative	3.1			0.1			1.1			304.9			—			309.2
	Research and development	—			—			—			29.8			—			29.8
	Operating income (loss)	(3.1		)	(0.1		)	(1.1		)	175.5			—			171.2
	Loss (earnings) from continuing operations of investment in subsidiaries	(120.7		)	(121.7		)	(118.5		)	—			360.9			—
	Other (income) expense:
	Equity income of unconsolidated subsidiaries	—			—			—			(0.5		)	—			(0.5		)
	Net interest expense	—			0.9			3.5			13.8			—			18.2
	Income (loss) from continuing operations before income taxes	117.6			120.7			113.9			162.2			(360.9		)	153.5
	Provision (benefit) for income taxes	(0.6		)	—			—			35.9			—			35.3
	Net income (loss) from continuing operations	118.2			120.7			113.9			126.3			(360.9		)	118.2
	Loss from discontinued operations, net of tax	—			—			—			(4.3		)	—			(4.3		)
	Earnings (loss) from discontinued operations of investment in subsidiaries	(4.3		)	(4.3		)	(4.3		)	—			12.9			—
	Net income (loss)	$	113.9		$	116.4		$	109.6		$	122		$	(348.0	)	$	113.9
	Comprehensive income (loss), net of tax
	Net income (loss)	$	113.9		$	116.4		$	109.6		$	122		$	(348.0	)	$	113.9
	Changes in cumulative translation adjustment	(174.2		)	(174.2		)	(174.2		)	(174.2		)	522.6			(174.2		)
	Changes in market value of derivative financial instruments	(0.1		)	(0.1		)	(0.1		)	(0.1		)	0.3			(0.1		)
	Comprehensive income (loss)	$	(60.4	)	$	(57.9	)	$	(64.7	)	$	(52.3	)	$	174.9		$	(60.4	)
	Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
	Three months ended March 29, 2014
	In millions	Parent			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company			Issuer			Subsidiaries
		Guarantor
	Net sales	$	—		$	—		$	1,644.00		$	—		$	1,644.00
	Cost of goods sold	—			—			1,079.90			—			1,079.90
	Gross profit	—			—			564.1			—			564.1
	Selling, general and administrative	(0.3		)	3.3			349.5			—			352.5
	Research and development	—			—			29.5			—			29.5
	Operating income (loss)	0.3			(3.3		)	185.1			—			182.1
	Loss (earnings) from continuing operations of investment in subsidiaries	(125.5		)	(134.0		)	—			259.5			—
	Other (income) expense:
	Equity income of unconsolidated subsidiaries	—			—			(0.3		)	—			(0.3		)
	Net interest expense	0.3			0.9			14.9			—			16.1
	Income (loss) from continuing operations before income taxes	125.5			129.8			170.5			(259.5		)	166.3
	Provision for income taxes	—			—			40.8			—			40.8
	Net income (loss) from continuing operations	125.5			129.8			129.7			(259.5		)	125.5
	Loss from discontinued operations, net of tax	—			—			(1.3		)	—			(1.3		)
	Loss from sale of discontinued operations, net of tax	—			—			(5.6		)	—			(5.6		)
	Earnings (loss) from discontinued operations of investment in subsidiaries	(6.9		)	(6.9		)	—			13.8			—
	Net income (loss)	$	118.6		$	122.9		$	122.8		$	(245.7	)	$	118.6
	Comprehensive income (loss), net of tax
	Net income (loss)	$	118.6		$	122.9		$	122.8		$	(245.7	)	$	118.6
	Changes in cumulative translation adjustment	(27.9		)	(27.9		)	(27.9		)	55.8			(27.9		)
	Changes in market value of derivative financial instruments	0.2			0.2			0.2			(0.4		)	0.2
	Comprehensive income (loss)	$	90.9		$	95.2		$	95.1		$	(190.3	)	$	90.9
Schedule of Condensed Consolidating Balance Sheet	Consolidating Balance Sheet
	March 28, 2015
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	—		$	0.2		$	130.9		$	—		$	131.1
	Accounts and notes receivable, net	—			—			—			1,247.50			—			1,247.50
	Inventories	—			—			—			1,177.00			—			1,177.00
	Other current assets	1.5			15.7			6.5			416.5			(27.7		)	412.5
	Current assets held for sale	—			—			—			8.8			—			8.8
	Total current assets	1.5			15.7			6.7			2,980.70			(27.7		)	2,976.90
	Property, plant and equipment, net	—			—			—			915.4			—			915.4
	Other assets
	Investments in subsidiaries	4,663.30			4,825.10			7,448.90			—			(16,937.3		)	—
	Goodwill	—			—			—			4,671.80			—			4,671.80
	Intangibles, net	—			—			—			1,559.10			—			1,559.10
	Other non-current assets	115.2			—			2,008.60			294.7			(1,998.2		)	420.3
	Non-current assets held for sale	—			—			—			25.9			—			25.9
	Total other assets	4,778.50			4,825.10			9,457.50			6,551.50			(18,935.5		)	6,677.10
	Total assets	$	4,780.00		$	4,840.80		$	9,464.20		$	10,447.60		$	(18,963.2	)	$	10,569.40
	Liabilities and Equity
	Current liabilities
	Current maturities of long-term debt and short-term borrowings	$	—		$	—		$	—		$	5.6		$	—		$	5.6
	Accounts payable	0.3			—			—			504.6			—			504.9
	Employee compensation and benefits	0.5			0.1			—			254.3			—			254.9
	Other current liabilities	64.5			1.6			13.3			602.5			(27.7		)	654.2
	Current liabilities held for sale	—			—			—			11.5			—			11.5
	Total current liabilities	65.3			1.7			13.3			1,378.50			(27.7		)	1,431.10
	Other liabilities
	Long-term debt	276.4			175.8			3,267.10			1,682.30			(1,998.2		)	3,403.40
	Pension and other post-retirement compensation and benefits	—			—			—			300.9			—			300.9
	Deferred tax liabilities	—			—			2.9			513.4			—			516.3
	Other non-current liabilities	15			—			—			475.4			—			490.4
	Non-current liabilities held for sale	—			—			—			4			—			4
	Total liabilities	356.7			177.5			3,283.30			4,354.50			(2,025.9		)	6,146.10
	Equity	4,423.30			4,663.30			6,180.90			6,093.10			(16,937.3		)	4,423.30
	Total liabilities and equity	$	4,780.00		$	4,840.80		$	9,464.20		$	10,447.60		$	(18,963.2	)	$	10,569.40
	Consolidating Balance Sheet
	December 31, 2014
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	—		$	0.1		$	110.3		$	—		$	110.4
	Accounts and notes receivable, net	—			—			—			1,206.80			(0.9		)	1,205.90
	Inventories	—			—			—			1,130.40			—			1,130.40
	Other current assets	—			17.6			2			367.6			(20.4		)	366.8
	Current assets held for sale	—			—			—			80.6			—			80.6
	Total current assets	—			17.6			2.1			2,895.70			(21.3		)	2,894.10
	Property, plant and equipment, net	—			—			—			950			—			950
	Other assets
	Investments in subsidiaries	4,733.00			4,893.80			7,612.20			—			(17,239.0		)	—
	Goodwill	—			—			—			4,741.90			—			4,741.90
	Intangibles, net	—			—			—			1,608.10			—			1,608.10
	Other non-current assets	80.2			—			1,381.80			345			(1,370.8		)	436.2
	Non-current assets held for sale	—			—			—			24.9			—			24.9
	Total other assets	4,813.20			4,893.80			8,994.00			6,719.90			(18,609.8		)	6,811.10
	Total assets	$	4,813.20		$	4,911.40		$	8,996.10		$	10,565.60		$	(18,631.1	)	$	10,655.20
	Liabilities and Equity
	Current liabilities
	Current maturities of long-term debt and short-term borrowings	$	—		$	—		$	—		$	6.7		$	—		$	6.7
Accounts payable	0.9			—			—			583.1			(0.9		)	583.1
Employee compensation and benefits	0.2			0.6			—			304.7			—			305.5
Other current liabilities	120.6			2.2			10.9			595.8			(20.4		)	709.1
Current liabilities held for sale	—			—			—			35.1			—			35.1
Total current liabilities	121.7			2.8			10.9			1,525.40			(21.3		)	1,639.50
Other liabilities
Long-term debt	11.4			175.6			2,860.60			1,320.60			(1,370.8		)	2,997.40
Pension and other post-retirement compensation and benefits	—			—			—			322			—			322
Deferred tax liabilities	—			—			2.9			525.4			—			528.3
Other non-current liabilities	16.3			—			—			481.4			—			497.7
Non-current liabilities held for sale	—			—			—			6.5			—			6.5
Total liabilities	149.4			178.4			2,874.40			4,181.30			(1,392.1		)	5,991.40
Equity	4,663.80			4,733.00			6,121.70			6,384.30			(17,239.0		)	4,663.80
Total liabilities and equity	$	4,813.20		$	4,911.40		$	8,996.10		$	10,565.60		$	(18,631.1	)	$	10,655.20
Schedule of Condensed Consolidating Statement of Cash Flows	Consolidating Statement of Cash Flows
	Three months ended March 28, 2015
	In millions	Parent			Subsidiary Guarantor			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company						Issuer			Subsidiaries
		Guarantor
	Operating activities
	Net cash provided by (used for) operating activities	$	79.5		$	102.4		$	107.9		$	(75.0	)	$	(348.0	)	$	(133.2	)
	Investing activities
	Capital expenditures	—			—			—			(34.8		)	—			(34.8		)
	Proceeds from sale of property and equipment	—			—			—			2.3			—			2.3
	Acquisitions, net of cash acquired	—			—			—			(3.0		)	—			(3.0		)
	Net intercompany loan activity	—			—			(468.5		)	163.4			305.1			—
	Net cash provided by (used for) investing activities of continuing operations	—			—			(468.5		)	127.9			305.1			(35.5		)
	Net cash provided by (used for) investing activities of discontinued operations	—			—			—			54.9			—			54.9
	Net cash provided by (used for) investing activities	—			—			(468.5		)	182.8			305.1			19.4
	Financing activities
	Net receipts (repayments) of commercial paper and revolving long-term debt	—			—			406.5			(0.5		)	—			406
	Repayments of long-term debt	—			—			—			(0.4		)	—			(0.4		)
	Net change in advances to subsidiaries	178			(102.4		)	(45.8		)	(72.7		)	42.9			—
	Excess tax benefits from share-based compensation	—			—			—			2.8			—			2.8
	Shares issued to employees, net of shares withheld	—			—			—			8.7			—			8.7
	Repurchases of ordinary shares	(200.0		)	—			—			—			—			(200.0		)
	Dividends paid	(57.5		)	—			—			—			—			(57.5		)
	Net cash provided by (used for) financing activities	(79.5		)	(102.4		)	360.7			(62.1		)	42.9			159.6
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(25.1		)	—			(25.1		)
	Change in cash and cash equivalents	—			—			0.1			20.6			—			20.7
	Cash and cash equivalents, beginning of period	—			—			0.1			110.3			—			110.4
	Cash and cash equivalents, end of period	$	—		$	—		$	0.2		$	130.9		$	—		$	131.1
	Consolidating Statement of Cash Flows
	Three months ended March 29, 2014
	In millions	Parent			Subsidiary			Non-guarantor			Eliminations			Consolidated Total
		Company			Issuer			Subsidiaries
		Guarantor
	Operating activities
	Net cash provided by (used for) operating activities	$	118		$	125.6		$	4.6		$	(245.7	)	$	2.5
	Investing activities
	Capital expenditures	—			—			(27.2		)	—			(27.2		)
	Proceeds from sale of property and equipment	—			—			0.4			—			0.4
	Other	—			—			(0.5		)	—			(0.5		)
	Net cash provided by (used for) investing activities	—			—			(27.3		)	—			(27.3		)
	Financing activities
	Net receipts of short-term borrowings	—			—			0.3			—			0.3
	Net receipts of commercial paper and revolving long-term debt	—			367.4			14.5			—			381.9
	Repayments of long-term debt	—			—			(0.9		)	—			(0.9		)
	Excess tax benefits from share-based compensation	—			—			6.1			—			6.1
	Net change in advances to subsidiaries	(69.1		)	(539.6		)	363			245.7			—
	Shares issued to employees, net of shares withheld	—			—			24			—			24
	Repurchases of ordinary shares	—			—			(252.2		)	—			(252.2		)
	Dividends paid	(49.2		)	—			—			—			(49.2		)
	Purchase of noncontrolling interest	—			—			(134.7		)	—			(134.7		)
	Net cash provided by (used for) financing activities	(118.3		)	(172.2		)	20.1			245.7			(24.7		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			(2.6		)	—			(2.6		)
	Change in cash and cash equivalents	(0.3		)	(46.6		)	(5.2		)	—			(52.1		)
	Cash and cash equivalents, beginning of period	0.5			47			208.5			—			256
	Cash and cash equivalents, end of period	$	0.2		$	0.4		$	203.3		$	—		$	203.9

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Jun. 27, 2015	Mar. 29, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			19.90%
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		($134.70)
Noncontrolling Interest, Ownership Percentage by Parent			80.10%
Payments to Acquire Businesses, Gross	96.4
Pentair Residential Filtration [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		$134.30

Discontinued_Operations_and_Di2

Discontinued Operations and Divestitures - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Business Acquisition [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		($5.60)
Cash sales price of business	54.9
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation		$2.40

Discontinued_Operations_and_Di3

Discontinued Operations and Divestitures - Components of Discontinued Operations (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Sep. 27, 2014	Mar. 29, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$18.60		$82.60
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	18.1		68.4
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)	0.5		14.2
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	-5.6		-1.7
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period	1.3		0.4
Income (Loss) from Discontinued Operations, Net of Tax	-4.3		-1.3
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax	0		-8
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal	0	12.3	2.4
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	0	-380.1	-5.6
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	0.2			7
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	1.6			28.8
Disposal Group, Including Discontinued Operation, Inventory	0			30.1
Disposal Group, Including Discontinued Operation, Other Current Assets	7			14.7
Assets of Disposal Group, Including Discontinued Operation, Current	8.8			80.6
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	18			18.5
Disposal Group, Including Discontinued Operation, Other Noncurrent Assets	7.9			6.4
Disposal Group, Including Discontinued Operation, Accounts Payable, Current	2.1			12.2
Disposal Group, Including Discontinued Operations, Employee Compensation and Benefits	4.1			11.3
Disposal Group, Including Discontinued Operation, Other Current Liabilities	5.3			11.6
Liabilities of Disposal Group, Including Discontinued Operation, Current	11.5			35.1
Disposal Group, Including Discontinued Operations, Long Term Debt	3.9			4
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation	0.1			2.5
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	4			6.5
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	$25.90			$24.90

Share_Plans_Additional_Informa

Share Plans - Additional Information (Detail) (2012 Stock and Incentive Plan, USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options and restricted stock units issued under stock and incentive plan	0.8
Number of stock option issued under stock and incentive plan	0.6
Weighted-average fair value of options granted	$16.73
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued under stock and incentive plan	0.2
Weighted-average fair value of restricted stock units granted	$66.44

Share_Plans_Assumptions_Used_i

Share Plans - Assumptions Used in Calculating Estimated Fair Value of Stock Option Award in Annual Grant (Detail)	3 Months Ended
	Mar. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.61%
Expected dividend yield	1.96%
Expected share price volatility	30.40%
Expected term (years)	6 years

Share_Plans_Sharebased_Compens

Share Plans - Share-based Compensation Cost by Award Type (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	$6.20	$4.90
Stock options	3.5	2.5
Total share-based compensation expense	$9.70	$7.40

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Dec. 31, 2014
			Person
Restructuring Cost and Reserve [Line Items]
Number of employees			1,150
Total restructuring costs	$0	$17.40
Valves & Controls
Restructuring Cost and Reserve [Line Items]
Number of employees			600
Total restructuring costs	0	9.8
Flow & Filtration Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees			350
Total restructuring costs	0	4.7
Water Quality Systems [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees			50
Total restructuring costs	0	0.3
Technical Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees			150
Total restructuring costs	$0	$2.60

Restructuring_Restructuring_Re

Restructuring - Restructuring Related Costs Included in Selling, General & Administrative expenses on Consolidated Statements of Income (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$0	$17.40
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	13.4
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$0	$4

Restructuring_Restructuring_Ac

Restructuring - Restructuring Accrual Activity recorded on Condensed Consolidated Balance Sheets (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$73.40
Cash payments and other	-12.5
Ending balance	$60.90

Earnings_Per_Share_Basic_and_D

Earnings Per Share - Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Computation Of Earnings Per Share Line Items
Net income	$113.90	$118.60
Income (Loss) from Continuing Operations Attributable to Parent	$118.20	$125.50
Weighted average common shares outstanding
Basic (shares)	180.1	196.2
Dilutive impact of stock options and restricted stock units (shares)	2.6	3.5
Diluted (shares)	182.7	199.7
Earnings per common share attributable to Pentair Ltd.
Income (Loss) from Continuing Operations, Per Basic Share	$0.66	$0.64
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	($0.03)	($0.04)
Basic (USD per share)	$0.63	$0.60
Income (Loss) from Continuing Operations, Per Diluted Share	$0.65	$0.63
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	($0.03)	($0.04)
Diluted (USD per share)	$0.62	$0.59
Anti-dilutive stock options excluded from the calculation of diluted earnings per share	1.2	0.5

Supplemental_Balance_Sheet_Inf2

Supplemental Balance Sheet Information (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventories
Raw materials and supplies	$447.60	$460.10
Work-in-process	244.5	229
Finished goods	484.9	441.3
Total inventories	1,177	1,130.40
Other current assets
Cost in excess of billings	108.9	103.5
Prepaid expenses	149.6	109.6
Deferred income taxes	132.3	139.4
Other current assets	21.7	14.3
Total other current assets	412.5	366.8
Property, plant and equipment, net
Land and land improvements	157.3	165.1
Buildings and leasehold improvements	476.1	493.5
Machinery and equipment	1,164	1,169.10
Construction in progress	69.4	71
Total property, plant and equipment	1,866.80	1,898.70
Accumulated depreciation and amortization	951.4	948.7
Total property, plant and equipment, net	915.4	950
Other non-current assets
Asbestos-related insurance receivable	112.9	115.8
Deferred income taxes	87.3	87.9
Other non-current assets	220.1	232.5
Total other non-current assets	420.3	436.2
Other current liabilities
Deferred revenue and customer deposits	124.9	112.7
Dividends payable	57.5	116.8
Billings in excess of cost	36.9	41.4
Accrued warranty	65.2	66.4
Other current liabilities	369.7	371.8
Total other current liabilities	654.2	709.1
Other non-current liabilities
Asbestos-related liabilities	247.5	249.1
Taxes payable	61	61.6
Other non-current liabilities	181.9	187
Total other non-current liabilities	$490.40	$497.70

Goodwill_and_Other_Identifiabl2

Goodwill and Other Identifiable Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015
Goodwill [Roll Forward]
Beginning Balance	$4,741.90
Acquisitions/ divestitures	6.3
Foreign currency translation/other	-76.4
Ending Balance	4,671.80
Valves & Controls
Goodwill [Roll Forward]
Beginning Balance	1,511.60
Acquisitions/ divestitures	0
Foreign currency translation/other	0
Ending Balance	1,511.60
Flow & Filtration Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	942.4
Acquisitions/ divestitures	0
Foreign currency translation/other	-55.2
Ending Balance	887.2
Water Quality Systems [Member]
Goodwill [Roll Forward]
Beginning Balance	1,137.60
Acquisitions/ divestitures	0
Foreign currency translation/other	-14.9
Ending Balance	1,122.70
Technical Solutions
Goodwill [Roll Forward]
Beginning Balance	1,150.30
Acquisitions/ divestitures	6.3
Foreign currency translation/other	-6.3
Ending Balance	$1,150.30

Goodwill_and_Other_Identifiabl3

Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Acquired Intangible Assets By Major Class [Line Items]
Cost	$1,997.90	$2,031.10
Accumulated amortization	-438.8	-423
Net	1,559.10	1,608.10
Net, indefinite-life intangibles	517.2	525.6
Finite-life intangibles
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,480.70	1,505.50
Accumulated amortization	-438.8	-423
Net	1,041.90	1,082.50
Finite-life intangibles | Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,229.20	1,247.80
Accumulated amortization	-338.9	-325.2
Net	890.3	922.6
Finite-life intangibles | Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Cost	1.9	2
Accumulated amortization	-1.1	-1.1
Net	0.8	0.9
Finite-life intangibles | Proprietary technology
Acquired Intangible Assets By Major Class [Line Items]
Cost	249.6	255.7
Accumulated amortization	-98.8	-96.7
Net	$150.80	$159

Goodwill_and_Other_Identifiabl4

Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Goodwill And Other Intangible Assets [Line Items]
Intangible asset amortization expense	$27.60	$28.50

Goodwill_and_Other_Identifiabl5

Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail) (USD $)	Mar. 28, 2015
In Millions, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Q2-Q4 2015	$87
2016	108.3
2017	106.7
2018	103.4
2019	96.3
2020	$91.50

Debt_Debt_and_Average_Interest

Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Total debt	$3,409
Debt and Capital Lease Obligations	3,409	3,004.10
Current maturities and short-term borrowings	-5.6	-6.7
Long-term debt	3,403.40	2,997.40
Commercial Paper
Debt Instrument [Line Items]
Debt, average interest rate	0.89%
Total debt	1,394.10	987.6
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt, average interest rate	6.09%
Capital Lease Obligations	5.6	6.7
Total debt	5.6
Senior Notes 1.350% Due in 2015 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, average interest rate	1.35%
Total debt	350	350
Senior Notes 1.875% Due 2017 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, average interest rate	1.88%
Total debt	350	350
Senior Notes 2.650% Due 2019 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, average interest rate	2.65%
Total debt	250	250
Senior Notes 5.000% Due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, average interest rate	5.00%
Total debt	500	500
Senior Notes 3.150% Due 2022 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt, average interest rate	3.15%
Total debt	550	550
Subsidiary Issuer
Debt Instrument [Line Items]
Long-term debt	3,267.10	2,860.60
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, average interest rate	1.43%
Total debt	$9.30	$9.80

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Dec. 31, 2014	Oct. 03, 2014
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$3,409
Compliance with debt agreement financial covenants	we were in compliance with all financial covenants in our debt agreements
Future minimum lease payments	5.7
Imputed interest	0.1
Capital lease obligation cost	18	19.5
Accumulated amortization related to assets under capital lease	2.5	2.4
Subsidiary Issuer
Debt Instrument [Line Items]
Ownership percentage	100.00%
Subsidiary Issuer | Senior Notes 1.350% Due in 2015
Debt Instrument [Line Items]
Debt, interest rate	1.35%
Subsidiary Issuer | Senior Notes 1.875% Due 2017
Debt Instrument [Line Items]
Debt, interest rate	1.88%
Subsidiary Issuer | Senior Notes 2.650% Due 2019
Debt Instrument [Line Items]
Debt, interest rate	2.65%
Subsidiary Issuer | Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Debt, interest rate	5.00%
Subsidiary Issuer | Senior Notes 3.150% Due 2022
Debt Instrument [Line Items]
Debt, interest rate	3.15%
Pentair, Inc [Member] | Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount	127
Pentair Finance S.A. [Member] | Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount	373
Maximum
Debt Instrument [Line Items]
Costs and expenses incurred in connection with acquisition excluded from computation of Net Income figure used in our debt covenant calculation	25
Debt agreement financial covenant, leverage ratio	3
Minimum
Debt Instrument [Line Items]
Debt agreement financial covenant, leverage ratio	3.5
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	65.7
Line of credit facility, amount outstanding	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			2,100
Debt, Long-term and Short-term, Combined Amount	9.3	9.8
Remaining availability under Credit Facility	696.6
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$1,394.10	$987.60

Debt_Debt_Outstanding_Matures_

Debt - Debt Outstanding Matures on Calendar Year Basis (Detail) (USD $)	Mar. 28, 2015
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Q2-Q4 2015	$5.60
2016	0
2017	350
2018	0
2019	2,003.40
2020	0
Thereafter	1,050
Total debt	3,409
Contractual Maturity
Debt Instrument [Line Items]
Q2-Q4 2015	0
2016	0
2017	350
2018	0
2019	2,003.40
2020	0
Thereafter	1,050
Total debt	3,403.40
Capital Lease Obligations
Debt Instrument [Line Items]
Q2-Q4 2015	5.6
2016	0
2017	0
2018	0
2019	0
2020	0
Thereafter	0
Total debt	$5.60

Derivatives_and_Financial_Inst2

Derivatives and Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended			1 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Sep. 27, 2014	Mar. 29, 2014	Apr. 30, 2011	Dec. 31, 2014
Derivative [Line Items]
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	$0	$380.10	$5.60
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal	0	12.3	2.4
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	226.8				250.8
Interest Rate Swap [Member]
Derivative [Line Items]
Average swap interest rate				3.65%
Cost of expiration (termination)				11
Derivative instrument contractual life				10 years
Unrealized loss	6.7				7
Derivative, Notional Amount				$400

Derivatives_and_Financial_Inst3

Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Dec. 31, 2014
Derivative [Line Items]
Total debt	$3,409
Recorded Amount
Derivative [Line Items]
Variable rate debt	1,403.40	997.4
Fixed rate debt	2,005.60	2,006.70
Total debt	3,409	3,004.10
Fair Value
Derivative [Line Items]
Variable rate debt	1,403.40	997.4
Fixed rate debt	2,090.70	2,070.40
Total debt	3,494.10	3,067.80
Interest Rate Swap [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	($6.70)	($7)

Derivatives_and_Financial_Inst4

Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) (Fair Value, Measurements, Recurring, USD $)	Mar. 28, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets			$0.90
Foreign Currency Contracts, Liability, Fair Value Disclosure	6.7		6.6
Deferred compensation plan	52.5	[1]	55.3	[1]
Total recurring fair value measurements	45.8		49.6
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	45.1	[1]	47.9	[1]
Total recurring fair value measurements	45.1		47.9
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets			0.9
Foreign Currency Contracts, Liability, Fair Value Disclosure	6.7		6.6
Deferred compensation plan	7.4	[1]	7.4	[1]
Total recurring fair value measurements	$0.70		$1.70
[1]	Deferred compensation plan assets include mutual funds, common/collective trusts and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees. The fair value of mutual funds and cash equivalents were based on quoted market prices in active markets. The underlying investments in the common/collective trusts primarily include intermediate and long-term debt securities, corporate debt securities, equity securities and fixed income securities. The overall fair value of the common/collective trusts are based on observable inputs.

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Income Taxes [Line Items]
Total gross liability for unrecognized tax benefits	$60.40	$62.10

Benefit_Plans_Components_of_Ne

Benefit Plans - Components of Net Periodic Benefit Cost (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$3.50	$3.30
Interest cost	3.7	3.8
Expected return on plan assets	-2.5	-2.6
Net periodic benefit cost	4.7	4.5
Non U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.6	2
Interest cost	3.8	4.7
Expected return on plan assets	-4.1	-4.2
Net periodic benefit cost	$2.30	$2.50

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014	Dec. 31, 2014	Sep. 27, 2014	20-May-14	Jun. 27, 2015
Stockholders Equity Note Disclosure [Line Items]
Repurchase of shares of our common stock up to a maximum aggregate value	$1,000,000,000
Common stock authorized for repurchase, expiration date	31-Dec-19
Share repurchase program remaining available amount	800,000,000
Share repurchase (in shares)	3.1
Repurchase of common stock, value	200,000,000	269,600,000
Dividends payable amount (USD per share)	$0.32		$0.30	$0.30	$1.20
Dividends Payable, Amount Per Share, Quarterly Dividends Declared			$0.32		$0.30
Dividends Payable, Amount Per Share, Increase (Decrease) in Quarterly Dividends Declared			$0.02
Dividends payable	$57,500,000		$116,800,000
Scenario, Forecast [Member]
Stockholders Equity Note Disclosure [Line Items]
Dividends payable amount (USD per share)						$0.32

Segment_Information_Financial_

Segment Information - Financial Information by Reportable Segment (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Segment Reporting Information [Line Items]
Net sales	$1,475	$1,644
Segment Income (Loss)	171.2	200.6
Valves & Controls
Segment Reporting Information [Line Items]
Net sales	429.2	531
Segment Income (Loss)	42	60.9
Flow & Filtration Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	350.1	401.1
Segment Income (Loss)	29.1	34.7
Water Quality Systems [Member]
Segment Reporting Information [Line Items]
Net sales	306.9	304
Segment Income (Loss)	49.3	47.7
Technical Solutions
Segment Reporting Information [Line Items]
Net sales	395.8	415.3
Segment Income (Loss)	72.7	79
Other
Segment Reporting Information [Line Items]
Net sales	-7	-7.4
Segment Income (Loss)	($21.90)	($21.70)

Segment_Information_Reconcilia

Segment Information Reconciliation of Operating Profit (Losee) from Segments to Consolidated (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Income (Loss)	$171.20	$200.60
Restructuring and other	0	-17
Redomicile Expense	0	-1.5
Operating Income (Loss)	$171.20	$182.10

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014
In Millions, unless otherwise specified	LegalMatter
Loss Contingencies [Line Items]
Number of asbestos-related claims outstanding	3,500
Estimated liability for asbestos-related claims	$247.50	$249.10
Estimated receivable for asbestos-related insurance recoveries	112.9	115.8
Environmental reserve	23.7	31.4
Letters of credit outstanding	386.1	370.1
Water Transport [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding	$26.20	$32.40

Commitments_and_Contingencies_2

Commitments and Contingencies - Changes in Carrying Amount of Service and Product Warranties (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$66.40
Product Warranty Accrual, Currency Translation, Increase (Decrease)	-1.8
Service and product warranty provision	13.8
Payments	-13.2
Ending balance	$65.20

Financial_Statements_of_Parent2

Financial Statements of Parent Company Guarantor - Additional Information (Detail) (Subsidiary Issuer)	3 Months Ended
	Mar. 28, 2015
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Ownership percentage	100.00%

Financial_Statements_of_Parent3

Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Sep. 27, 2014	Mar. 29, 2014
Condensed Financial Statements, Captions [Line Items]
Net sales	$1,475		$1,644
Cost of goods sold	964.8		1,079.90
Gross profit	510.2		564.1
Selling, general and administrative	309.2		352.5
Research and development	29.8		29.5
Operating Income (Loss)	171.2		182.1
Income (Loss) from Equity Method Investments	-0.5		-0.3
Other (income) expense:
Net interest expense	18.2		16.1
Income before income taxes and noncontrolling interest	153.5		166.3
Provision for income taxes	35.3		40.8
Net Income (Loss) from Continuing Operations	118.2		125.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	4.3		1.3
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	0	-380.1	-5.6
Net income (loss) attributable to Pentair plc	113.9		118.6
Income (Loss) from Continuing Operations Attributable to Parent	118.2		125.5
Comprehensive income (loss), net of tax
Net income	113.9		118.6
Changes in cumulative translation adjustment	174.2		27.9
Changes in market value of derivative financial instruments	-0.1		0.2
Comprehensive income (loss) attributable to Pentair plc	-60.4		90.9
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative	3.1		-0.3
Operating Income (Loss)	-3.1		0.3
Other (income) expense:
Net interest expense	0		0.3
Income before income taxes and noncontrolling interest	117.6		125.5
Provision for income taxes	-0.6		0
Net Income (Loss) from Continuing Operations	118.2		125.5
Net income (loss) attributable to Pentair plc	113.9		118.6
Comprehensive income (loss), net of tax
Net income	113.9		118.6
Changes in cumulative translation adjustment	174.2		27.9
Changes in market value of derivative financial instruments	-0.1		0.2
Comprehensive income (loss) attributable to Pentair plc	-60.4		90.9
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative	0.1
Operating Income (Loss)	-0.1
Other (income) expense:
Net interest expense	0.9
Income before income taxes and noncontrolling interest	120.7
Provision for income taxes	0
Net Income (Loss) from Continuing Operations	120.7
Net income (loss) attributable to Pentair plc	116.4
Comprehensive income (loss), net of tax
Net income	116.4
Changes in cumulative translation adjustment	174.2
Changes in market value of derivative financial instruments	-0.1
Comprehensive income (loss) attributable to Pentair plc	-57.9
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative	1.1		3.3
Operating Income (Loss)	-1.1		-3.3
Other (income) expense:
Net interest expense	3.5		0.9
Income before income taxes and noncontrolling interest	113.9		129.8
Provision for income taxes	0		0
Net Income (Loss) from Continuing Operations	113.9		129.8
Net income (loss) attributable to Pentair plc	109.6		122.9
Comprehensive income (loss), net of tax
Net income	109.6		122.9
Changes in cumulative translation adjustment	174.2		27.9
Changes in market value of derivative financial instruments	-0.1		0.2
Comprehensive income (loss) attributable to Pentair plc	-64.7		95.2
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	1,475		1,644
Cost of goods sold	964.8		1,079.90
Gross profit	510.2		564.1
Selling, general and administrative	304.9		349.5
Research and development	29.8		29.5
Operating Income (Loss)	175.5		185.1
Income (Loss) from Equity Method Investments	-0.5		-0.3
Other (income) expense:
Net interest expense	13.8		14.9
Income before income taxes and noncontrolling interest	162.2		170.5
Provision for income taxes	35.9		40.8
Net Income (Loss) from Continuing Operations	126.3		129.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	4.3		1.3
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax			5.6
Net income (loss) attributable to Pentair plc	122		122.8
Comprehensive income (loss), net of tax
Net income	122		122.8
Changes in cumulative translation adjustment	174.2		27.9
Changes in market value of derivative financial instruments	-0.1		0.2
Comprehensive income (loss) attributable to Pentair plc	-52.3		95.1
Eliminations
Other (income) expense:
Income before income taxes and noncontrolling interest	-360.9		259.5
Net Income (Loss) from Continuing Operations	-360.9		-259.5
Net income (loss) attributable to Pentair plc	-348		-245.7
Comprehensive income (loss), net of tax
Net income	-348		-245.7
Changes in cumulative translation adjustment	-522.6		-55.8
Changes in market value of derivative financial instruments	0.3		-0.4
Comprehensive income (loss) attributable to Pentair plc	174.9		-190.3
Continuing Operations [Member] | Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-120.7		-125.5
Continuing Operations [Member] | Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-121.7
Continuing Operations [Member] | Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-118.5		-134
Continuing Operations [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	360.9		259.5
Discontinued Operations [Member] | Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-4.3		-6.9
Discontinued Operations [Member] | Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-4.3
Discontinued Operations [Member] | Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	-4.3		-6.9
Discontinued Operations [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Loss (earnings) from investment in subsidiaries	$12.90		$13.80

Financial_Statements_of_Parent4

Financial Statements of Parent Company Guarantor - Condensed Consolidating Balance Sheet (Detail) (USD $)	Mar. 28, 2015	Dec. 31, 2014	Mar. 29, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current assets
Cash and cash equivalents	$131.10	$110.40	$203.90	$256
Accounts and notes receivable, net	1,247.50	1,205.90
Inventories	1,177	1,130.40
Other current assets	412.5	366.8
Assets of Disposal Group, Including Discontinued Operation, Current	8.8	80.6
Total current assets	2,976.90	2,894.10
Property, plant and equipment, net	915.4	950
Other assets
Investments in subsidiaries		4,893.80
Goodwill	4,671.80	4,741.90
Intangibles, net	1,559.10	1,608.10
Other non-current assets	420.3	436.2
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	25.9	24.9
Total other assets	6,677.10	6,811.10
Total assets	10,569.40	10,655.20
Current liabilities
Current maturities of long-term debt and short-term borrowings	5.6	6.7
Accounts payable	504.9	583.1
Employee compensation and benefits	254.9	305.5
Other current liabilities	654.2	709.1
Liabilities of Disposal Group, Including Discontinued Operation, Current	11.5	35.1
Total current liabilities	1,431.10	1,639.50
Other liabilities
Long-term debt	3,403.40	2,997.40
Pension and other post-retirement compensation and benefits	300.9	322
Deferred tax liabilities	516.3	528.3
Other non-current liabilities	490.4	497.7
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	4	6.5
Total liabilities	6,146.10	5,991.40
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	4,423.30	4,663.80
Total equity	4,423.30	4,663.80	5,936.30	6,217.70
Total liabilities and equity	10,569.40	10,655.20
Parent Company Guarantor
Current assets
Cash and cash equivalents	0	0	0.2	0.5
Accounts and notes receivable, net	0	0
Inventories		0
Other current assets	1.5	0
Total current assets	1.5	0
Property, plant and equipment, net		0
Other assets
Investments in subsidiaries	4,663.30	4,733
Other non-current assets	115.2	80.2
Total other assets	4,778.50	4,813.20
Total assets	4,780	4,813.20
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	0.3	0.9
Employee compensation and benefits	0.5	0.2
Other current liabilities	64.5	120.6
Total current liabilities	65.3	121.7
Other liabilities
Long-term debt	276.4	11.4
Other non-current liabilities	15	16.3
Total liabilities	356.7	149.4
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	4,423.30
Total equity		4,663.80
Total liabilities and equity	4,780	4,813.20
Guarantor Subsidiary [Member]
Current assets
Cash and cash equivalents	0
Accounts and notes receivable, net	0
Other current assets	15.7	17.6
Total current assets	15.7	17.6
Other assets
Investments in subsidiaries	4,825.10
Other non-current assets	0
Total other assets	4,825.10	4,893.80
Total assets	4,840.80	4,911.40
Current liabilities
Accounts payable	0
Employee compensation and benefits	0.1	0.6
Other current liabilities	1.6	2.2
Total current liabilities	1.7	2.8
Other liabilities
Long-term debt	175.8	175.6
Other non-current liabilities	0
Total liabilities	177.5	178.4
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	4,663.30
Total equity		4,733
Total liabilities and equity	4,840.80	4,911.40
Subsidiary Issuer
Current assets
Cash and cash equivalents	0.2	0.1	0.4	47
Accounts and notes receivable, net	0	0
Inventories		0
Other current assets	6.5	2
Total current assets	6.7	2.1
Property, plant and equipment, net		0
Other assets
Investments in subsidiaries	7,448.90	7,612.20
Other non-current assets	2,008.60	1,381.80
Total other assets	9,457.50	8,994
Total assets	9,464.20	8,996.10
Current liabilities
Current maturities of long-term debt and short-term borrowings		0
Accounts payable	0	0
Other current liabilities	13.3	10.9
Total current liabilities	13.3	10.9
Other liabilities
Long-term debt	3,267.10	2,860.60
Deferred tax liabilities	2.9	2.9
Total liabilities	3,283.30	2,874.40
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	6,180.90
Total equity		6,121.70
Total liabilities and equity	9,464.20	8,996.10
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	130.9	110.3	203.3	208.5
Accounts and notes receivable, net	1,247.50	1,206.80
Inventories	1,177	1,130.40
Other current assets	416.5	367.6
Assets of Disposal Group, Including Discontinued Operation, Current	8.8	80.6
Total current assets	2,980.70	2,895.70
Property, plant and equipment, net	915.4	950
Other assets
Goodwill	4,671.80	4,741.90
Intangibles, net	1,559.10	1,608.10
Other non-current assets	294.7	345
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	25.9	24.9
Total other assets	6,551.50	6,719.90
Total assets	10,447.60	10,565.60
Current liabilities
Current maturities of long-term debt and short-term borrowings	5.6	6.7
Accounts payable	504.6	583.1
Employee compensation and benefits	254.3	304.7
Other current liabilities	602.5	595.8
Liabilities of Disposal Group, Including Discontinued Operation, Current	11.5	35.1
Total current liabilities	1,378.50	1,525.40
Other liabilities
Long-term debt	1,682.30	1,320.60
Pension and other post-retirement compensation and benefits	300.9	322
Deferred tax liabilities	513.4	525.4
Other non-current liabilities	475.4	481.4
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	4	6.5
Total liabilities	4,354.50	4,181.30
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	6,093.10
Total equity		6,384.30
Total liabilities and equity	10,447.60	10,565.60
Eliminations
Current assets
Accounts and notes receivable, net	0	-0.9
Other current assets	-27.7	-20.4
Total current assets	-27.7	-21.3
Other assets
Investments in subsidiaries	-16,937.30	-17,239
Other non-current assets	-1,998.20	-1,370.80
Total other assets	-18,935.50	-18,609.80
Total assets	-18,963.20	-18,631.10
Current liabilities
Accounts payable	0	-0.9
Other current liabilities	-27.7	-20.4
Total current liabilities	-27.7	-21.3
Other liabilities
Long-term debt	-1,998.20	-1,370.80
Other non-current liabilities	0	0
Total liabilities	-2,025.90	-1,392.10
Equity
Shareholders' equity attributable to Pentair plc and subsidiaries	-16,937.30
Total equity		-17,239
Total liabilities and equity	($18,963.20)	($18,631.10)

Financial_Statements_of_Parent5

Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Operating activities
Net cash provided by (used for) operating activities	($133.20)	$2.50
Investing activities
Capital expenditures	-34.8	-27.2
Proceeds from sale of property and equipment	2.3	0.4
Payments to Acquire Businesses, Net of Cash Acquired	-3	0
Payments for (Proceeds from) Other Investing Activities	0	-0.5
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	-35.5	-27.3
Cash Provided by (Used in) Investing Activities, Discontinued Operations	54.9	0
Net cash provided by (used for) investing activities	19.4	-27.3
Financing activities
Net receipts (repayments) of short-term borrowings	0	0.3
Net receipts of commercial paper and revolving long-term debt	406	381.9
Repayments of long-term debt	-0.4	-0.9
Excess tax benefits from share-based compensation	2.8	6.1
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	8.7	24
Repurchases of ordinary shares	-200	-252.2
Dividends paid	-57.5	-49.2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	0	-134.7
Net cash provided by (used for) financing activities	159.6	-24.7
Effect of exchange rate changes on cash and cash equivalents	-25.1	-2.6
Change in cash and cash equivalents	20.7	-52.1
Cash and cash equivalents, beginning of period	110.4	256
Cash and cash equivalents, end of period	131.1	203.9
Parent Company Guarantor
Operating activities
Net cash provided by (used for) operating activities	79.5	118
Investing activities
Payments to Acquire Businesses, Net of Cash Acquired	0
Net cash provided by (used for) investing activities		0
Financing activities
Net change in advances to subsidiaries	178	-69.1
Repurchases of ordinary shares	200
Dividends paid	-57.5	-49.2
Net cash provided by (used for) financing activities	-79.5	-118.3
Change in cash and cash equivalents	0	-0.3
Cash and cash equivalents, beginning of period	0	0.5
Cash and cash equivalents, end of period	0	0.2
Guarantor Subsidiary [Member]
Operating activities
Net cash provided by (used for) operating activities	102.4
Financing activities
Net change in advances to subsidiaries	-102.4
Net cash provided by (used for) financing activities	-102.4
Cash and cash equivalents, end of period	0
Subsidiary Issuer
Operating activities
Net cash provided by (used for) operating activities	107.9	125.6
Investing activities
Intercompany Loan Activity, Net	-468.5
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	-468.5
Net cash provided by (used for) investing activities	-468.5
Financing activities
Net receipts of commercial paper and revolving long-term debt	406.5	367.4
Net change in advances to subsidiaries	-45.8	-539.6
Net cash provided by (used for) financing activities	360.7	-172.2
Change in cash and cash equivalents	0.1	-46.6
Cash and cash equivalents, beginning of period	0.1	47
Cash and cash equivalents, end of period	0.2	0.4
Non-Guarantor Subsidiaries
Operating activities
Net cash provided by (used for) operating activities	-75	4.6
Investing activities
Capital expenditures	-34.8	-27.2
Proceeds from sale of property and equipment	2.3	0.4
Payments to Acquire Businesses, Net of Cash Acquired	3
Intercompany Loan Activity, Net	163.4
Payments for (Proceeds from) Other Investing Activities		-0.5
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	127.9
Cash Provided by (Used in) Investing Activities, Discontinued Operations	54.9
Net cash provided by (used for) investing activities	182.8	-27.3
Financing activities
Net receipts (repayments) of short-term borrowings		0.3
Net receipts of commercial paper and revolving long-term debt	-0.5	14.5
Repayments of long-term debt	-0.4	-0.9
Excess tax benefits from share-based compensation	2.8	6.1
Net change in advances to subsidiaries	-72.7	363
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	8.7	24
Repurchases of ordinary shares	0	-252.2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		-134.7
Net cash provided by (used for) financing activities	-62.1	20.1
Effect of exchange rate changes on cash and cash equivalents	-25.1	-2.6
Change in cash and cash equivalents	20.6	-5.2
Cash and cash equivalents, beginning of period	110.3	208.5
Cash and cash equivalents, end of period	130.9	203.3
Eliminations
Operating activities
Net cash provided by (used for) operating activities	-348	-245.7
Investing activities
Intercompany Loan Activity, Net	305.1
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	305.1
Net cash provided by (used for) investing activities	305.1
Financing activities
Net change in advances to subsidiaries	42.9	245.7
Net cash provided by (used for) financing activities	$42.90	$245.70