XML 69 R59.htm IDEA: XBRL DOCUMENT v3.20.2
Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension (Detail) - Net Periodic Benefit Cost - Pension Benefits - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.1 $ 0.1 $ 0.2 $ 0.2
Interest cost 7.1 8.2 14.2 16.4
Expected return on plan assets (8.2) (8.8) (16.4) (17.6)
Net periodic benefit income $ (1.0) $ (0.5) $ (2.0) $ (1.0)