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Employee Benefit Plans (Fair Value Pension Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 815.6 $ 808.6 $ 711.0
Percentage of fixed income securities in investment-grade corporate bonds 13.00% 44.00%  
Percentage of fixed income securities in government treasuries 50.00% 20.00%  
Percentage of fixed income securities in high-yield securities 8.00% 11.00%  
Percentage of fixed income securities in foreign securities 20.00% 10.00%  
Percentage of fixed income securities in asset-backed and mortgage-backed securities   6.00%  
Percentage of fixed income securities in other various fixed income securities 6.00% 9.00%  
Percentage of alternative investments in relative value funds 42.00% 42.00%  
Percentage of alternative investments in long-short equity funds 28.00% 25.00%  
Percentage of alternative investments in event-driven funds 14.00% 14.00%  
Percentage of alternative investments in credit funds 8.00% 14.00%  
Percentage of alternative investments in hedged and non-hedged funds 8.00% 5.00%  
Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 108.1 $ 314.3  
Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 102.5 235.3  
Pension plan | Non-U.S. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   4.7  
Pension plan | U.K. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   65.2  
Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 5.6 5.2  
Pension plan | U.S. small cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   3.9  
Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 615.9 412.4  
Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 615.9 162.9  
Pension plan | International fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   249.5  
Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 45.2 40.6  
Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.5 2.1  
Pension plan | Hedge funds measured at net asset value      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 41.7 38.5  
Pension plan | Miscellaneous funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 40.2 36.6  
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 6.2 4.7  
Total | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 815.6 808.6  
Level 1 | Pension plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 639.7 647.9  
Level 1 | Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 23.8 235.5  
Level 1 | Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 18.2 156.5  
Level 1 | Pension plan | Non-U.S. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   4.7  
Level 1 | Pension plan | U.K. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   65.2  
Level 1 | Pension plan | U.S. large cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 5.6 5.2  
Level 1 | Pension plan | U.S. small cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   3.9  
Level 1 | Pension plan | Total fixed income share      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 615.9 412.4  
Level 1 | Pension plan | Aggregate fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 615.9 162.9  
Level 1 | Pension plan | International fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   249.5  
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 84.3 78.8  
Level 2 | Pension plan | Total equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 84.3 78.8  
Level 2 | Pension plan | Global equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 84.3 78.8  
Level 2 | Pension plan | Non-U.S. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
Level 2 | Pension plan | U.K. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
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 | U.S. small cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   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 | International fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   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 43.7 38.7 33.1
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 | Non-U.S. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
Level 3 | Pension plan | U.K. equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   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 | U.S. small cap equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   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 | International fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
Level 3 | Pension plan | Total alternative investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.5 2.1 2.3
Level 3 | Pension plan | Private equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.5 2.1  
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 40.2 36.6 $ 30.8
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