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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2009
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                        
Defined Benefit Plan, Amortization of Net Gains (Losses)         $ 6.8       $ 0.6      
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)         0.1       2.0      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year   8.50%                    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00%                      
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2019                      
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components     1.5                  
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components     1.7                  
Defined Benefit Plan, Service Cost           4.8 4.9 5.2   0.9 1.0 2.3
Defined Benefit Plan, Interest Cost           37.1 36.8 36.1   17.1 16.1 17.8
Defined Benefit Plan, Expected Return on Plan Assets           (31.9) (31.8) (30.4)   0 0 0
Defined Benefit Plan, Amortization of Gains (Losses)           4.5 2.5 1.3   0.4 (1.4) (1.7)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)           (0.1) 0 (0.1)   (3.2) (3.1) (5.4)
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period       1.8   0 0 2.5   0 0 (0.7)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments       69.5   0 0.2 (1.5)   0 0 (68.0)
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements           0.1 0 0.4   0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost           $ 14.5 $ 12.6 $ 13.5   $ 15.2 $ 12.6 $ (55.7)