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Employee Benefit Plans (Fair Value Pension Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of fixed income securities in asset-backed and mortgage-backed securities   3.00%  
Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 528.7 $ 815.6 $ 808.6
Percentage of fixed income securities in investment-grade corporate bonds 14.00% 13.00%  
Percentage of fixed income securities in government treasuries 57.00% 50.00%  
Percentage of fixed income securities in high-yield securities 7.00% 8.00%  
Percentage of fixed income securities in foreign securities 21.00% 20.00%  
Percentage of fixed income securities in other various fixed income securities 1.00% 6.00%  
Percentage of alternative investments in relative value funds 51.00% 42.00%  
Percentage of alternative investments in long-short equity funds 23.00% 28.00%  
Percentage of alternative investments in event-driven funds 11.00% 14.00%  
Percentage of alternative investments in credit funds 9.00% 8.00%  
Percentage of alternative investments in hedged and non-hedged funds 6.00% 8.00%  
Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 53.0 $ 108.1  
Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 50.1 102.5  
Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.9 5.6  
Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 394.1 615.9  
Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 394.1 615.9  
Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 34.6 45.2  
Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 3.5  
Pension plan | Hedge funds measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 32.2 41.7  
Pension plan | Miscellaneous funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 37.8 40.2  
Pension plan | Cash and equivalents measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 9.2 6.2  
Total | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 528.7 815.6  
Level 1 | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 405.7 639.7  
Level 1 | Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 11.6 23.8  
Level 1 | Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 8.7 18.2  
Level 1 | Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.9 5.6  
Level 1 | Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 394.1 615.9  
Level 1 | Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 394.1 615.9  
Level 1 | Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 1 | Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 1 | Pension plan | Hedge funds measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 1 | Pension plan | Miscellaneous funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 1 | Pension plan | Cash and equivalents measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 41.4 84.3  
Level 2 | Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 41.4 84.3  
Level 2 | Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 41.4 84.3  
Level 2 | Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Hedge funds measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Miscellaneous funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 2 | Pension plan | Cash and equivalents measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 40.2 43.7 38.7
Level 3 | Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 3.5 2.1
Level 3 | Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 3.5  
Level 3 | Pension plan | Hedge funds measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Level 3 | Pension plan | Miscellaneous funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 37.8 40.2 $ 36.6
Level 3 | Pension plan | Cash and equivalents measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 0.0 $ 0.0