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Employee Benefits (Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets $ 899.3 $ 808.4 $ 867.1 $ 899.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 899.3 808.4    
Fair value of plan assets at year end 867.1 899.3    
Fair Value, Measurements, Recurring [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 899.3 899.3 867.1 899.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 899.3      
Fair value of plan assets at year end 867.1 899.3    
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 241.6 241.6 187.6 241.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 241.6      
Fair value of plan assets at year end 187.6 241.6    
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 422.9 422.9 360.4 422.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 422.9      
Fair value of plan assets at year end 360.4 422.9    
Fair Value, Measurements, Recurring [Member] | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension assets at fair value     274.9 197.8
Fair value of plan assets 234.8 171.7 319.1 234.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 234.8 171.7    
Purchases 42.2 37.8    
Sales (12.1) (5.3)    
Unrealized gain (loss) 54.2 30.6    
Fair value of plan assets at year end 319.1 234.8    
Fair Value, Measurements, Recurring [Member] | Equities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 224.1 224.1 186.6 224.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 224.1      
Fair value of plan assets at year end 186.6 224.1    
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 112.2 112.2 83.2 112.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 112.2      
Fair value of plan assets at year end 83.2 112.2    
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 111.9 111.9 103.4 111.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 111.9      
Fair value of plan assets at year end 103.4 111.9    
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]        
Fair value of plan assets 104.7 104.7 131.1 104.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 104.7      
Fair value of plan assets at year end 131.1 104.7    
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]        
Pension assets at fair value     91.1 67.7
Unfunded Commitments     11.3 18.2
Fair value of plan assets 104.7 60.3 131.1 104.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 104.7 60.3    
Purchases 11.3 32.8    
Sales (1.8) (1.0)    
Unrealized gain (loss) 16.9 12.6    
Fair value of plan assets at year end 131.1 104.7    
Fair Value, Measurements, Recurring [Member] | Corporate        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 171.0 171.0 229.0 171.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 171.0      
Fair value of plan assets at year end 229.0 171.0    
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 7.9 7.9 16.0 7.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 7.9      
Fair value of plan assets at year end 16.0 7.9    
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 33.0 33.0 25.0 33.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 33.0      
Fair value of plan assets at year end 25.0 33.0    
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 130.1 130.1 188.0 130.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 130.1      
Fair value of plan assets at year end 188.0 130.1    
Fair Value, Measurements, Recurring [Member] | Government        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 264.3 264.3 194.5 264.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 264.3      
Fair value of plan assets at year end 194.5 264.3    
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 106.9 106.9 73.0 106.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 106.9      
Fair value of plan assets at year end 73.0 106.9    
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 157.4 157.4 121.5 157.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 157.4      
Fair value of plan assets at year end 121.5 157.4    
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] | Absolute Return        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 120.6 120.6 110.5 120.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 120.6      
Fair value of plan assets at year end 110.5 120.6    
Fair Value, Measurements, Recurring [Member] | Absolute Return | 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] | Absolute Return | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fair value of plan assets 120.6 120.6 110.5 120.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 120.6      
Fair value of plan assets at year end 110.5 120.6    
Fair Value, Measurements, Recurring [Member] | Absolute Return | 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 14.6 14.6 15.4 14.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 14.6      
Fair value of plan assets at year end 15.4 14.6    
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 14.6 14.6 15.4 14.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 14.6      
Fair value of plan assets at year end 15.4 14.6    
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 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 | 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 | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension assets at fair value     183.8 130.1
Unfunded Commitments     4.0 12.6
Fair value of plan assets 130.1 111.4 $ 188.0 $ 130.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets beginning of year 130.1 111.4    
Purchases 30.9 5.0    
Sales (10.3) (4.3)    
Unrealized gain (loss) 37.3 18.0    
Fair value of plan assets at year end $ 188.0 $ 130.1    
Minimum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Redemption notice period for assets with fair value estimated using NAV per share 1 day      
Maximum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Redemption notice period for assets with fair value estimated using NAV per share 90 days