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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   $ 691.8  
Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   617.6  
Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   27.8  
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 617.1 $ 691.8 $ 601.7
Percentage of Fixed Income Securities Consisting of Foreign Securities 17.00% 15.00%  
Percentage of fixed income securities consisting of investment-grade corporate bonds 36.00% 30.00%  
Percentage of fixed income securities consisting of high-yield securities 13.00% 13.00%  
Percentage of fixed income securities consisting of government treasuries 27.00% 29.00%  
Percentage of fixed income securities consisting of other various fixed income securities 7.00% 13.00%  
Percentage of alternative investments consisting of long-short equity funds 22.00% 26.00%  
Percentage of alternative investments consisting of event-driven funds 22.00% 21.00%  
Percentage of alternative investments consisting of relative value funds 44.00% 39.00%  
Percentage of alternative investments consisting of credit funds 5.00% 6.00%  
Percentage of alternative investments consisting of hedged and non-hedged funds 7.00% 8.00%  
Pension Benefits | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 547.7    
Pension Benefits | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0    
Pension Benefits | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 30.5 $ 27.8 23.8
Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 226.9 267.2  
Pension Benefits | Equity Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 226.9 267.2  
Pension Benefits | Equity Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Equity Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Global Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 104.4 121.7  
Pension Benefits | Global Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 104.4 121.7  
Pension Benefits | Global Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Global Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Non-U.S. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.0 4.3  
Pension Benefits | Non-U.S. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.0 4.3  
Pension Benefits | Non-U.S. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Non-U.S. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.K. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 112.4 129.9  
Pension Benefits | U.K. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 112.4 129.9  
Pension Benefits | U.K. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.K. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Large Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.5 6.9  
Pension Benefits | U.S. Large Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.5 6.9  
Pension Benefits | U.S. Large Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Large Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Small Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 4.4  
Pension Benefits | U.S. Small Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 4.4  
Pension Benefits | U.S. Small Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Small Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 320.8 350.4  
Pension Benefits | Fixed Income Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 320.8 350.4  
Pension Benefits | Fixed Income Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Fixed Income Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.3 2.4  
Pension Benefits | Private Equity Funds [Member] | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member] | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member] | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.3 2.4  
Pension Benefits | Aggregate Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 131.5 136.0  
Pension Benefits | Aggregate Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 131.5 136.0  
Pension Benefits | Aggregate Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Aggregate Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | International Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 189.3 214.4  
Pension Benefits | International Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 189.3 214.4  
Pension Benefits | International Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | International Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 31.8 34.8  
Pension Benefits | Cash and Cash Equivalents | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 34.1 37.2  
Pension Benefits | Alternative Investments | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.3 2.4 2.4
Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 28.2 25.4  
Pension Benefits | Miscellaneous Funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Miscellaneous Funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Miscellaneous Funds | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 28.2 25.4 $ 21.4
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 7.1 11.6  
Pension Benefits | Cash [Member] | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash [Member] | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash [Member] | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 $ 0.0  
Preferred Stock [Member] | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.2    
Preferred Stock [Member] | Pension Benefits | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 0.2