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Employee Benefits (Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets $ 998.3 $ 878.7 $ 874.9 $ 998.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 998.3 878.7    
Fair value of plan assets at year end 874.9 998.3    
Fair Value, Measurements, Recurring [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investments measured at net asset value     536.8 562.6
Fair value of plan assets 998.3 998.3 874.9 998.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 998.3      
Fair value of plan assets at year end 874.9 998.3    
Fair Value, Measurements, Recurring [Member] | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 170.3 170.3 129.9 170.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 170.3      
Fair value of plan assets at year end 129.9 170.3    
Fair Value, Measurements, Recurring [Member] | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 212.8 212.8 163.9 212.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 212.8      
Fair value of plan assets at year end 163.9 212.8    
Fair Value, Measurements, Recurring [Member] | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 52.6 41.8 44.3 52.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 52.6 41.8    
Purchases 0.6 3.9    
Sales (0.3) (1.1)    
Unrealized gain (loss) (8.6) 8.0    
Fair value of plan assets at year end 44.3 52.6    
Fair Value, Measurements, Recurring [Member] | Equities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 104.1 104.1 67.7 104.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 104.1      
Fair value of plan assets at year end 67.7 104.1    
Fair Value, Measurements, Recurring [Member] | Equities | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 101.5 101.5 65.5 101.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 101.5      
Fair value of plan assets at year end 65.5 101.5    
Fair Value, Measurements, Recurring [Member] | Equities | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 2.6 2.6 2.2 2.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 2.6      
Fair value of plan assets at year end 2.2 2.6    
Fair Value, Measurements, Recurring [Member] | Equities | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 0.0 0.0 0.0 0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 0.0      
Fair value of plan assets at year end 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Private equities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investments measured at net asset value     155.2 143.9
Unfunded Commitments     2.8 8.2
Fair value of plan assets 46.6 46.6 43.4 46.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 46.6      
Fair value of plan assets at year end 43.4 46.6    
Fair Value, Measurements, Recurring [Member] | Private equities | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 0.0 0.0 0.0 0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 0.0      
Fair value of plan assets at year end 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Private equities | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 0.0 0.0 0.0 0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 0.0      
Fair value of plan assets at year end 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Private equities | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 46.6 38.3 43.4 46.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 46.6 38.3    
Purchases 0.0 1.9    
Sales (0.3) (1.1)    
Unrealized gain (loss) (2.9) 7.5    
Fair value of plan assets at year end 43.4 46.6    
Fair Value, Measurements, Recurring [Member] | Corporate        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 34.2 34.2 24.8 34.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 34.2      
Fair value of plan assets at year end 24.8 34.2    
Fair Value, Measurements, Recurring [Member] | Corporate | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 9.6 9.6 7.7 9.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 9.6      
Fair value of plan assets at year end 7.7 9.6    
Fair Value, Measurements, Recurring [Member] | Corporate | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 18.6 18.6 16.2 18.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 18.6      
Fair value of plan assets at year end 16.2 18.6    
Fair Value, Measurements, Recurring [Member] | Corporate | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 6.0 6.0 0.9 6.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 6.0      
Fair value of plan assets at year end 0.9 6.0    
Fair Value, Measurements, Recurring [Member] | Government        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 210.3 210.3 177.1 210.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 210.3      
Fair value of plan assets at year end 177.1 210.3    
Fair Value, Measurements, Recurring [Member] | Government | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 54.2 54.2 67.2 54.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 54.2      
Fair value of plan assets at year end 67.2 54.2    
Fair Value, Measurements, Recurring [Member] | Government | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 156.1 156.1 109.9 156.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 156.1      
Fair value of plan assets at year end 109.9 156.1    
Fair Value, Measurements, Recurring [Member] | Government | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 0.0 0.0 0.0 0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 0.0      
Fair value of plan assets at year end 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Interest bearing        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 40.5 40.5 25.1 40.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 40.5      
Fair value of plan assets at year end 25.1 40.5    
Fair Value, Measurements, Recurring [Member] | Interest bearing | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 5.0 5.0 (10.5) 5.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 5.0      
Fair value of plan assets at year end (10.5) 5.0    
Fair Value, Measurements, Recurring [Member] | Interest bearing | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 35.5 35.5 35.6 35.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 35.5      
Fair value of plan assets at year end 35.6 35.5    
Fair Value, Measurements, Recurring [Member] | Interest bearing | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 0.0 0.0 0.0 0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 0.0      
Fair value of plan assets at year end 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Fixed income        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investments measured at net asset value     189.2 181.0
Unfunded Commitments     0.5 0.5
Fair Value, Measurements, Recurring [Member] | Fixed income | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 6.0 3.5 0.9 6.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 6.0 3.5    
Purchases 0.6 2.0    
Sales 0.0 0.0    
Unrealized gain (loss) (5.7) 0.5    
Fair value of plan assets at year end $ 0.9 $ 6.0    
Fair Value, Measurements, Recurring [Member] | Equity Funds [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investments measured at net asset value     84.0 112.7
Fair Value, Measurements, Recurring [Member] | Absolute Return        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investments measured at net asset value     $ 108.4 $ 125.0
Minimum | Fair Value, Measurements, Recurring [Member] | Equity Funds [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment redemption, notice period 3 days 3 days    
Minimum | Fair Value, Measurements, Recurring [Member] | Absolute Return        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment redemption, notice period 2 days 2 days    
Maximum | Fair Value, Measurements, Recurring [Member] | Equity Funds [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment redemption, notice period 30 days 30 days    
Maximum | Fair Value, Measurements, Recurring [Member] | Absolute Return        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Investment redemption, notice period 45 days 45 days