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Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension Benefits (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Recognition of actuarial losses     $ 2.1 $ 0.3
Net Periodic Benefit Cost        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.1 $ 0.1 0.3 0.4
Interest cost 8.3 7.7 24.7 23.0
Expected return on plan assets (8.8) (10.3) (26.4) (30.8)
Recognition of actuarial losses 2.1 0.3 2.1 0.3
Net periodic benefit loss (income) $ 1.7 $ (2.2) $ 0.7 $ (7.1)