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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 4,411.3 $ 4,685.8
Q4 2016 0.0  
2017 0.0  
2018 500.0  
2019 2,230.6  
2020 400.0  
2021 500.0  
Thereafter 800.0  
Total debt, excluding unamortized issuance costs and discounts 4,430.6  
Senior Notes 1.875% Due 2017 | Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 350.0 $ 350.0