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Pro Forma Consolidated FInancial Results of Operations (Detail) (Business Acquisition Pro Forma Information, USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Business Acquisition Pro Forma Information
Business Acquisition [Line Items]
Pro forma net sales	$ 1,857
Pro forma net income attributable to Pentair Ltd.	$ 107
Diluted earnings per common share attributable to Pentair Ltd.	$ 0.51

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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