Consolidated Statements Of Operations And Comprehensive Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net sales	$ 7,479.7		$ 4,416.1		$ 3,456.7
Cost of goods sold	5,006.8		3,146.5		2,383.0
Gross profit	2,472.9		1,269.6		1,073.7
Selling, general and administrative	1,562.1		1,158.4		694.8
Research and development	125.8		93.6		78.2
Impairment of trade names and goodwill	11.0		60.7		200.5
Operating income (loss)	774.0		(43.1)		100.2
Other (income) expense
Gain on sale of businesses, net	(19.7)		0		0
Loss on early extinguishment of debt	0		75.4		0
Equity income of unconsolidated subsidiaries	(1.8)		(2.1)		(1.9)
Interest income	(7.6)		(2.9)		(1.4)
Interest expense	76.7		70.5		60.3
Income (loss) before income taxes and noncontrolling interest	726.4		(184.0)		43.2
Provision (benefit) for income taxes	183.8		(79.4)		46.4
Net income (loss) before noncontrolling interest	542.6		(104.6)		(3.2)
Noncontrolling interest	5.8		2.6		4.3
Net income (loss) attributable to Pentair Ltd.	536.8		(107.2)		(7.5)
Comprehensive income (loss), net of tax
Net income (loss) before noncontrolling interest	542.6		(104.6)		(3.2)
Changes in cumulative translation adjustment	(29.1)		31.4		(93.7)
Amortization of pension and other post-retirement prior service cost, net of $0.2, $0.2 and $0 tax, respectively	(0.4)		(0.3)		0
Changes in market value of derivative financial instruments, net of $0.7, $3.7 and $2.9 tax, respectively	(0.3)		(3.6)		4.4
Total comprehensive income (loss)	512.8		(77.1)		(92.5)
Less: Comprehensive income (loss) attributable to noncontrolling interest	8.0		4.0		2.2
Comprehensive income (loss) attributable to Pentair Ltd.	$ 504.8		$ (81.1)		$ (94.7)
Earnings (loss) per common share attributable to Pentair Ltd.
Basic	$ 2.67	[1]	$ (0.84)	[1]	$ (0.08)
Diluted	$ 2.62	[1]	$ (0.84)	[1]	$ (0.08)
Weighted average common shares outstanding
Basic (shares)	201.1		127.4		98.2
Diluted (shares)	204.6		127.4		98.2

[1] Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average common shares outstanding during that period