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Pensions and Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Defined Benefit Plan Disclosure      
Service cost $ 1.5 $ 4.5 $ 4.4
Interest cost 9.0 10.4 12.2
Expected return on plan assets (18.3) (18.9) (15.7)
Amortization of prior service cost 0.1 0.1 0.2
Amortization of net loss 0.7 5.2 6.6
Settlements 0.0 0.0 0.0
Curtailments 0.0 0.3 0.0
Net periodic benefit cost (7.0) 1.6 7.7
Other Benefits      
Defined Benefit Plan Disclosure      
Service cost 0.0 0.0 0.1
Interest cost 0.1 0.1 0.1
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost 0.0 0.0 0.2
Amortization of net loss 0.1 0.2 0.0
Settlements 0.0 (1.1) 0.0
Curtailments 0.0 0.0 0.0
Net periodic benefit cost $ 0.2 $ (0.8) $ 0.4