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Acquisitions and Divestitures - Pro Forma Consolidated Financial Results of Operations (Detail) (Pro Forma Information, USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Pro Forma Information
Business Acquisition [Line Items]
Pro forma net sales	$ 1,924.8	$ 3,781.3
Pro forma net income attributable to Pentair Ltd.	$ 108.7	$ 215.9
Diluted earnings per common share attributable to Pentair Ltd.	$ 0.51	$ 1.02

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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