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Pension and Savings Plans - Change in Benefit Obligation, Plan Assets and Funded Status of Pension Plans (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 580.9 $ 751.7  
Service cost 0.1 0.1 $ 0.2
Interest cost 20.1 21.4 20.4
Benefits Paid and Administrative Fees (36.1) (55.1)  
Actuarial loss (gain) 3.4 (137.2)  
Settlement (443.2) 0.0  
Projected benefit obligation at end of period 125.2 580.9 751.7
Change in plan assets:      
Fair value of plan assets at beginning of period 583.3 772.4  
Actual return on plan assets 23.1 (134.0)  
Employer contributions (11.1) 0.0  
Benefits paid (36.1) (55.1)  
Settlement (443.2) 0.0  
Fair value of plan assets at end of period 116.0 583.3 $ 772.4
Funded status at end of period (9.2) 2.4  
Amounts recognized in the consolidated balance sheets:      
Noncurrent asset (included in “Investments and other assets”) 0.0 9.9  
Noncurrent obligation (included in “Other noncurrent liabilities”) (9.2) (7.5)  
Net amount recognized $ (9.2) $ 2.4