XML 106 R90.htm IDEA: XBRL DOCUMENT v3.22.0.1
Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 1,834.4 $ 2,036.8  
Funded status of plan (129.3) (59.3)  
Employer contributions 4.0 2.9  
Settlement loss 11.4 $ 10.5 $ 9.5
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement 4.0    
Expected contribution $ 2.8    
Expected return on plan assets 5.20% 5.70% 6.10%
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Funded status of plan $ 262.5 $ 304.4  
Employer contributions 19.8 21.6  
Settlement loss 0.0 $ 1.5 $ 0.0
Expected contribution $ 21.5    
Expected return on plan assets 5.50% 5.67% 5.83%