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Restructuring - Restructuring Related Costs Included in Selling, General & Administrative expenses on Consolidated Statements of Income (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 0us-gaap_RestructuringCharges $ 17.4us-gaap_RestructuringCharges
Severance and related costs    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= pnr_SeveranceAndRelatedCostsMember
13.4us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= pnr_SeveranceAndRelatedCostsMember
Other    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
$ 4.0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember