Condensed Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Common shares	Treasury shares	Capital contribution reserve	Retained earnings	Accumulated other comprehensive income (loss)	Total Pentair Ltd.	Noncontrolling interest
Beginning Balance at Dec. 31, 2011	$ 2,047.4	$ 47.5		$ 457.7	$ 1,465.8	$ (37.7)	$ 1,933.3	$ 114.1
Beginning Balance (in shares) at Dec. 31, 2011		98.6
Net income	137.5				134.5		134.5	3.0
Changes in cumulative translation adjustment	(45.0)					(44.0)	(44.0)	(1.0)
Changes in market value of derivative financial instruments, net of $0.1 and $1.2 tax for the six months ended June 29, 2013 and June 30, 2012, respectively	3.1					3.1	3.1
Dividends declared	(44.1)				(44.1)		(44.1)
Exercise of options, net of shares tendered for payment	15.1	0.2		14.9			15.1
Exercise of options, net of shares tendered for payment (in shares)		0.5
Issuance of restricted shares, net of cancellations	3.7	0.1		3.6			3.7
Issuance of restricted shares, net of cancellations (in shares)		0.2
Shares surrendered by employees to pay taxes	(2.5)	0		(2.5)			(2.5)
Shares surrendered by employees to pay taxes (in shares)		(0.1)
Share-based compensation	4.6			4.6			4.6
Ending Balance at Jun. 30, 2012	2,119.8	47.8		478.3	1,556.2	(78.6)	2,003.7	116.1
Ending Balance (in shares) at Jun. 30, 2012		99.2
Beginning Balance at Dec. 31, 2012	6,479.2	113.5	(315.5)	5,283.8	1,292.5	(11.6)	6,362.7	116.5
Beginning Balance (in shares) at Dec. 31, 2012		213.0	(6.9)
Net income	208.7				205.8		205.8	2.9
Changes in cumulative translation adjustment	(118.2)					(117.7)	(117.7)	(0.5)
Changes in market value of derivative financial instruments, net of $0.1 and $1.2 tax for the six months ended June 29, 2013 and June 30, 2012, respectively	0.3					0.3	0.3
Tax benefits of share-based compensation	6.2			6.2			6.2
Dividends declared	(199.2)			(199.2)			(199.2)
Distribution to noncontrolling interest	(2.0)							(2.0)
Share repurchase	(490.3)		(490.3)				(490.3)
Share repurchase (in shares)			(9.0)
Exercise of options, net of shares tendered for payment	50.7		68.6	(17.9)			50.7
Exercise of options, net of shares tendered for payment (in shares)			1.6
Issuance of restricted shares, net of cancellations			24.8	(24.8)
Issuance of restricted shares, net of cancellations (in shares)			0.7
Shares surrendered by employees to pay taxes	(10.6)		(8.7)	(1.9)			(10.6)
Shares surrendered by employees to pay taxes (in shares)			(0.2)
Share-based compensation	18.1			18.1			18.1
Ending Balance at Jun. 29, 2013	$ 5,942.9	$ 113.5	$ (721.1)	$ 5,064.3	$ 1,498.3	$ (129.0)	$ 5,826.0	$ 116.9
Ending Balance (in shares) at Jun. 29, 2013		213.0	(13.8)