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Defined Benefit Plans - Components of Net Periodic Benefit Income for Pension Benefits (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Recognition of actuarial losses     $ 0.4 $ 1.1
Net Periodic Benefit Cost [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.0 $ 0.1 0.2 0.3
Interest cost 6.4 6.0 19.1 18.0
Expected return on plan assets (8.9) (8.7) (26.6) (26.2)
Recognition of actuarial losses 0.4 1.1 0.4 1.1
Net periodic benefit income $ (2.1) $ (1.5) $ (6.9) $ (6.8)