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Other Post-Employment Benefits and Other Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net periodic benefit cost:      
Service cost $ 10.6 $ 11.3  
Interest cost 33.3 37.6  
Other Post-Employment Benefits and Other Employee Benefit Plans [Member]      
Components of net periodic benefit cost:      
Service cost 0.2 0.9 $ 0.8
Interest cost 1.9 3.0 3.2
Amortization of net loss   0.4 0.1
Amortization of prior service credit (1.6) (0.8) (0.7)
Net periodic benefit cost $ 0.6 $ 3.5 $ 3.4