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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3.5 $ 2.7 $ 9.9 $ 8.3
Interest cost 2.7 3.5 7.9 10.5
Expected return on plan assets (2.4) (3.1) (7.0) (9.3)
Amortization of prior service cost 0.1 0.1 0.2 0.2
Recognized actuarial losses 4.6 3.3 13.3 10.0
Total $ 8.5 $ 6.5 $ 24.3 $ 19.7