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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of net periodic benefit cost:      
Service cost $ 11.3 $ 10.0 $ 12.3
Interest cost 37.6 48.0 43.4
Amortization of net loss 10.7 9.9 10.0
Amortization of prior service credit 0.1 0.1 0.4
Total benefit cost (income) 10.2 16.2 17.0
Other Post-Employment Benefits and Other Employee Benefit Plans [Member]      
Components of net periodic benefit cost:      
Service cost 0.9 0.8 0.9
Interest cost 3.0 3.2 3.0
Amortization of net loss 0.4 0.1 0.4
Amortization of prior service credit (0.8) (0.7) (0.7)
Total benefit cost (income) $ 3.5 $ 3.4 $ 3.6