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Pension and Postretirement Benefit Plans (Fair Value of Pension Assets) (Details) - Pension plan - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets $ 572.0 $ 528.7 $ 815.6
Government treasuries      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 67.00% 57.00%  
Foreign      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 27.00% 21.00%  
Investment grade corporate bonds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 4.00% 14.00%  
High-yield      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 2.00% 7.00%  
Other      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage   1.00%  
Relative value funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 53.00% 51.00%  
Long-short equity funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 24.00% 23.00%  
Event-driven funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 8.00% 11.00%  
Credit funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 9.00% 9.00%  
Hedged and non-hedged funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Investment within plan asset category, percentage 6.00% 6.00%  
Total of Level 1, Level 2, and Level 3 | Total equity securities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets $ 55.8 $ 53.0  
Total of Level 1, Level 2, and Level 3 | Global equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 55.8 50.1  
Total of Level 1, Level 2, and Level 3 | U.S. large cap equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets   2.9  
Total of Level 1, Level 2, and Level 3 | Total fixed income share      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 437.1 394.1  
Total of Level 1, Level 2, and Level 3 | Aggregate fixed income      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 437.1 394.1  
Total of Level 1, Level 2, and Level 3 | Total alternative investments      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 35.4 34.6  
Total of Level 1, Level 2, and Level 3 | Private equity fund      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 2.2 2.4  
Total of Level 1, Level 2, and Level 3 | Miscellaneous funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 38.8 37.8  
Level 1      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 437.1 405.7  
Level 1 | Total equity securities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 11.6  
Level 1 | Global equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 8.7  
Level 1 | U.S. large cap equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets   2.9  
Level 1 | Total fixed income share      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 437.1 394.1  
Level 1 | Aggregate fixed income      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 437.1 394.1  
Level 1 | Total alternative investments      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 1 | Private equity fund      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0  
Level 1 | Miscellaneous funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 2      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 55.8 41.4  
Level 2 | Total equity securities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 55.8 41.4  
Level 2 | Global equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 55.8 41.4  
Level 2 | U.S. large cap equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets   0.0  
Level 2 | Total fixed income share      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 2 | Aggregate fixed income      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 2 | Total alternative investments      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 2 | Private equity fund      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 2 | Miscellaneous funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 3      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 41.0 40.2 43.7
Level 3 | Total equity securities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 3 | Global equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 3 | U.S. large cap equities      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets   0.0  
Level 3 | Total fixed income share      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 3 | Aggregate fixed income      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 0.0 0.0  
Level 3 | Total alternative investments      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 2.2 2.4 3.5
Level 3 | Private equity fund      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 2.2 2.4  
Level 3 | Miscellaneous funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 38.8 37.8 $ 40.2
Measured at net asset value per share | Hedge funds      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets 33.2 32.2  
Measured at net asset value per share | Cash and cash equivalents      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Total assets $ 4.9 $ 9.2