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Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension (Detail) - 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]        
Recognition of actuarial losses     $ 0.6 $ 2.1
Net Periodic Benefit Cost | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.1 $ 0.1 0.3 0.3
Interest cost 7.0 8.3 21.2 24.7
Expected return on plan assets (8.1) (8.8) (24.5) (26.4)
Recognition of actuarial losses 0.6 2.1 0.6 2.1
Net periodic benefit (income) expense $ (0.4) $ 1.7 $ (2.4) $ 0.7