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Components of Net Periodic Pension Cost (Detail) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost, net of employee contributions $ 6.6 $ 7.3
Interest cost 4.8 4.7
Expected return on plan assets (8.3) (8.1)
Amortization 3.3 2.6
Net periodic pension cost $ 6.4 $ 6.5