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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2.8 $ 3.0
Interest cost 3.5 3.6
Expected return on plan assets (3.2) (3.4)
Amortization of prior service cost 0.1 0.1
Recognized actuarial losses 3.4 3.5
Total $ 6.6 $ 6.8