Condensed Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Ordinary shares	Treasury shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Total Pentair plc	Noncontrolling interest
Beginning Balance at Dec. 31, 2013	$ 6,217.7	$ 113.5	$ (875.1)	$ 5,071.4	$ 1,829.1	$ (43.6)	$ 6,095.3	$ 122.4
Beginning Balance (in shares) at Dec. 31, 2013		(213.0)	(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	(2.0)	(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	5,936.3	113.5	(1,105.1)	5,051.5	1,947.7	(71.3)	5,936.3	0
Ending Balance (in shares) at Mar. 29, 2014		(213.0)	(18.3)
Beginning Balance at Dec. 31, 2014	4,663.8	2.0	(1,251.9)	4,250.0	2,044.0	(380.3)	4,663.8	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)		0	(200.0)			(200.0)
Share repurchase (in shares)	(3.1)	(3.1)	0
Exercise of options, net of shares tendered for payment	12.2		16.0	(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	$ 4,423.3	$ 2.0	$ (1,230.8)	$ 4,048.8	$ 2,157.9	$ (554.6)	$ 4,423.3	$ 0
Ending Balance (in shares) at Mar. 28, 2015		(199.3)	19.5