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Pension and Savings Plans - Change in Benefit Obligation, Plan Assets and Funded Status of Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized in the consolidated balance sheets:      
Noncurrent asset (included in “Investments and other assets”) $ 9.9 $ 28.5  
Pension Plan      
Change in benefit obligation:      
Accumulated postretirement benefit obligation at beginning of period 751.7 816.4  
Service cost 0.1 0.2 $ 0.3
Interest cost 21.4 20.4 28.0
Benefits paid (55.1) (55.9)  
Actuarial gain (137.2) (29.4)  
Accumulated postretirement benefit obligation at end of period 580.9 751.7 816.4
Funded status at end of period 2.4 20.7  
Change in plan assets:      
Fair value of plan assets at beginning of period 772.4 847.5  
Actual return on plan assets (134.0) (19.2)  
Benefits paid (55.1) (55.9)  
Fair value of plan assets at end of period 583.3 772.4 $ 847.5
Amounts recognized in the consolidated balance sheets:      
Noncurrent obligation (included in Other noncurrent liabilities) (7.5) (7.8)  
Net amount recognized $ 2.4 $ 20.7