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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.1 $ 0.1 $ 0.2 $ 0.2
Interest cost 6.4 6.0 12.7 12.0
Expected return on plan assets (8.9) (8.8) (17.7) (17.5)
Net periodic benefit income $ (2.4) $ (2.7) $ (4.8) $ (5.3)