XML 107 R83.htm IDEA: XBRL DOCUMENT v3.22.0.1
Pensions and Postretirement Benefits - Schedule of Change in Projected Benefit Obligations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Change in Projected Benefit Obligations      
Projected benefit obligations at beginning of year $ 350.7 $ 329.5  
Service cost 1.5 4.5 $ 4.4
Interest cost 9.0 10.4 12.2
Actuarial loss (gain) (10.7) 30.5  
Settlements 0.0 0.0  
Benefits paid (14.4) (13.0)  
Curtailments 0.0 (5.1)  
Plan combination (acquisitions/divestitures) 0.0 (6.8)  
Other (0.4) 0.7  
Projected benefit obligations at end of year 335.7 350.7 329.5
Other Benefits      
Change in Projected Benefit Obligations      
Projected benefit obligations at beginning of year 3.8 4.0  
Service cost 0.0 0.0 0.1
Interest cost 0.1 0.1 0.1
Actuarial loss (gain) (0.6) 0.4  
Settlements (0.1) (0.6)  
Benefits paid (0.3) (0.5)  
Curtailments 0.0 0.0  
Plan combination (acquisitions/divestitures) 0.0 0.0  
Other 0.2 0.4  
Projected benefit obligations at end of year $ 3.1 $ 3.8 $ 4.0