Financial Statements of Parent Company Guarantor - Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 265.1		$ 261.3		$ 50.1		$ 46.1
Accounts and notes receivable, net	1,334.3		1,274.6
Inventories	1,243.3		1,333.9
Other current assets	389.4		334.5
Total current assets	3,232.1		3,204.3
Property, plant and equipment, net	1,170.0		1,188.2		387.5
Other assets
Investments in subsidiaries	0		0
Goodwill	5,134.2		5,111.0		2,273.9
Intangibles, net	1,776.1		1,926.9
Other non-current assets	430.9		452.3
Total other assets	7,341.2		7,490.2
Total assets	11,743.3	[1]	11,882.7	[1]	4,586.3	[1]
Current liabilities
Current maturities of long-term debt and short-term borrowings	2.5		3.1
Accounts payable	596.6		567.0
Employee compensation and benefits	347.1		296.7
Other current liabilities	664.0		778.3
Total current liabilities	1,610.2		1,645.1
Other liabilities
Long-term debt	2,552.6		2,454.3
Pension and other post-retirement compensation and benefits	324.8		378.8
Deferred tax liabilities	580.6		421.9
Other non-current liabilities	457.4		495.1
Total liabilities	5,525.6		5,395.2
Equity
Shareholders' equity attributable to Pentair Ltd. and subsidiaries	6,095.3		6,371.1
Noncontrolling interest	122.4		116.4
Total equity	6,217.7		6,487.5		2,047.4		2,205.0
Total liabilities and equity	11,743.3		11,882.7
Pentair Ltd.
Current assets
Cash and cash equivalents	0.5		0		0
Accounts and notes receivable, net	2.9		20.2
Inventories	0		0
Other current assets	1.4		85.8
Total current assets	4.8		106.0
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	6,224.7		6,486.3
Goodwill	0		0
Intangibles, net	0		0
Other non-current assets	31.6		31.6
Total other assets	6,256.3		6,517.9
Total assets	6,261.1		6,623.9
Current liabilities
Current maturities of long-term debt and short-term borrowings	0		0
Accounts payable	48.1		54.3
Employee compensation and benefits	0.5		0
Other current liabilities	99.6		180.9
Total current liabilities	148.2		235.2
Other liabilities
Long-term debt	0		0
Pension and other post-retirement compensation and benefits	0		0
Deferred tax liabilities	0		0
Other non-current liabilities	17.6		17.6
Total liabilities	165.8		252.8
Equity
Shareholders' equity attributable to Pentair Ltd. and subsidiaries	6,095.3		6,371.1
Noncontrolling interest	0		0
Total equity	6,095.3		6,371.1
Total liabilities and equity	6,261.1		6,623.9
Subsidiary Issuer
Current assets
Cash and cash equivalents	47.0		0		0
Accounts and notes receivable, net	4.0		1,458.3
Inventories	0		0
Other current assets	0.6		0
Total current assets	51.6		1,458.3
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	8,066.6		7,464.6
Goodwill	0		0
Intangibles, net	0		0
Other non-current assets	1,302.7		6.9
Total other assets	9,369.3		7,471.5
Total assets	9,420.9		8,929.8
Current liabilities
Current maturities of long-term debt and short-term borrowings	0		0
Accounts payable	8.6		1.7
Employee compensation and benefits	0		0
Other current liabilities	11.7		11.5
Total current liabilities	20.3		13.2
Other liabilities
Long-term debt	2,401.9		2,297.7
Pension and other post-retirement compensation and benefits	0		0
Deferred tax liabilities	2.2		0
Other non-current liabilities	0		0
Total liabilities	2,424.4		2,310.9
Equity
Shareholders' equity attributable to Pentair Ltd. and subsidiaries	6,996.5		6,618.9
Noncontrolling interest	0		0
Total equity	6,996.5		6,618.9
Total liabilities and equity	9,420.9		8,929.8
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	217.6		261.3		50.1
Accounts and notes receivable, net	1,391.0		1,330.7
Inventories	1,243.3		1,333.9
Other current assets	387.4		333.1
Total current assets	3,239.3		3,259.0
Property, plant and equipment, net	1,170.0		1,188.2
Other assets
Investments in subsidiaries	0		0
Goodwill	5,134.2		5,111.0
Intangibles, net	1,776.1		1,926.9
Other non-current assets	393.3		413.8
Total other assets	7,303.6		7,451.7
Total assets	11,712.9		11,898.9
Current liabilities
Current maturities of long-term debt and short-term borrowings	2.5		3.1
Accounts payable	603.5		587.3
Employee compensation and benefits	346.6		296.7
Other current liabilities	552.7		670.3
Total current liabilities	1,505.3		1,557.4
Other liabilities
Long-term debt	1,447.4		1,614.9
Pension and other post-retirement compensation and benefits	324.8		378.8
Deferred tax liabilities	578.4		421.9
Other non-current liabilities	439.8		477.5
Total liabilities	4,295.7		4,450.5
Equity
Shareholders' equity attributable to Pentair Ltd. and subsidiaries	7,294.8		7,332.0
Noncontrolling interest	122.4		116.4
Total equity	7,417.2		7,448.4
Total liabilities and equity	11,712.9		11,898.9
Eliminations
Current assets
Cash and cash equivalents	0		0		0
Accounts and notes receivable, net	(63.6)		(1,534.6)
Inventories	0		0
Other current assets	0		(84.4)
Total current assets	(63.6)		(1,619.0)
Property, plant and equipment, net	0		0
Other assets
Investments in subsidiaries	(14,291.3)		(13,950.9)
Goodwill	0		0
Intangibles, net	0		0
Other non-current assets	(1,296.7)		0
Total other assets	(15,588.0)		(13,950.9)
Total assets	(15,651.6)		(15,569.9)
Current liabilities
Current maturities of long-term debt and short-term borrowings	0		0
Accounts payable	(63.6)		(76.3)
Employee compensation and benefits	0		0
Other current liabilities	0		(84.4)
Total current liabilities	(63.6)		(160.7)
Other liabilities
Long-term debt	(1,296.7)		(1,458.3)
Pension and other post-retirement compensation and benefits	0		0
Deferred tax liabilities	0		0
Other non-current liabilities	0		0
Total liabilities	(1,360.3)		(1,619.0)
Equity
Shareholders' equity attributable to Pentair Ltd. and subsidiaries	(14,291.3)		(13,950.9)
Noncontrolling interest	0		0
Total equity	(14,291.3)		(13,950.9)
Total liabilities and equity	$ (15,651.6)		$ (15,569.9)

[1] All cash and cash equivalents are included in “Other.”