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Defined Benefit Plans - Components of Net Periodic Benefit Income for Pension Benefits (Detail) - Net Periodic Benefit Cost [Member] - Pension Benefits [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.1 $ 0.1
Interest cost 6.3 6.0
Expected return on plan assets (8.8) (8.7)
Net periodic benefit income $ (2.4) $ (2.6)