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Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension (Detail) - Net Periodic Benefit Cost - Pension Benefits - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.1 $ 0.1
Interest cost 7.1 8.2
Expected return on plan assets (8.2) (8.8)
Net periodic benefit income $ (1.0) $ (0.5)