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Employee Benefit Plans (Fair Value Pension Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   $ 711.0  
Percentage of Fixed Income Securities Consisting of Asset-Backed and Mortgage-Backed Securities 6.00%    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 808.6 $ 711.0 $ 617.1
Percentage of Fixed Income Securities Consisting of Investment-grade Corporate Bonds 44.00% 43.00%  
Percentage of Fixed Income Securities Consisting of Government Treasuries 20.00% 18.00%  
Percentage of fixed income securities consisting of high-yield securities 11.00% 14.00%  
Percentage of Fixed Income Securities Consisting of Foreign Securities 10.00% 10.00%  
Percentage of Fixed Income Securities Consisting of Asset-Backed and Mortgage-Backed Securities   9.00%  
Percentage of Fixed Income Securities Consisting of Other Various Fixed Income Securities 9.00% 6.00%  
Percentage of Alternative Investments Consisting of Relative Value Funds 42.00% 42.00%  
Percentage of Alternative Investments Consisting of Long-short Equity Funds 25.00% 24.00%  
Percentage of Alternative Investments Consisting of Event-driven Funds 14.00% 21.00%  
Percentage of Alternative Investments Consisting of Credit Funds 14.00% 6.00%  
Percentage of Alternative Investments Consisting of Hedged and Non-hedged Funds 5.00% 7.00%  
Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 314.3 $ 261.7  
Pension Benefits | Global Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 235.3 183.4  
Pension Benefits | Non-U.S. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.7 3.8  
Pension Benefits | U.K. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 65.2 65.2  
Pension Benefits | U.S. Large Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 5.2 5.9  
Pension Benefits | U.S. Small Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.9 3.4  
Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 412.4 370.1  
Pension Benefits | Aggregate Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 162.9 150.1  
Pension Benefits | International Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 249.5 220.0  
Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 40.6 35.6  
Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.1 2.3  
Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 38.5 33.3  
Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 36.6 30.8  
Pension Benefits | Cash and cash equivalents measured at net asset value [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.7 12.8  
Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 808.6    
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   564.9  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 647.9    
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 235.5 194.8  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Global Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 156.5 116.5  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.7 3.8  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.K. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 65.2 65.2  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 5.2 5.9  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.9 3.4  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 412.4 370.1  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 162.9 150.1  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | International Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 249.5 220.0  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Cash [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   66.9  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 78.8    
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 78.8 66.9  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Global Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 78.8 66.9  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.K. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | International Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Cash [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   33.1  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 38.7 33.1 30.5
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Global Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.K. Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | International Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.1 2.3 2.3
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.1 2.3  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 36.6 30.8 $ 28.2
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Cash [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 0.0 $ 0.0