Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Components of Accumulated Other Comprehensive Income (Loss) (Detail)

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Basis of Presentation - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]        
Foreign currency translation adjustment, net of tax $ (183.0) $ (96.4) $ (25.6)  
Unrealized gain on derivatives, net of tax 17.4 18.0 5.7  
Unrealized gain on available-for-sale investments, net of tax 0.1 0.2 0.1  
Total accumulated other comprehensive loss $ (165.5) $ (78.2) $ (19.8) $ (31.7)