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Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension Benefits (Detail) - Net Periodic Benefit Cost - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.1 $ 0.1 $ 0.2 $ 0.3
Interest cost 8.2 7.7 16.4 15.3
Expected return on plan assets (8.8) (10.2) (17.6) (20.5)
Net periodic benefit income $ (0.5) $ (2.4) $ (1.0) $ (4.9)