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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Pension Plans, Defined Benefit [Member]
Jun. 30, 2013
Pension Plans, Defined Benefit [Member]
Jun. 30, 2014
Pension Plans, Defined Benefit [Member]
Jun. 30, 2013
Pension Plans, Defined Benefit [Member]
Jun. 30, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2014
Scenario, Forecast [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Service cost $ 0.9 $ 0.9 $ 1.8 $ 1.8 $ 0.1 $ 0.1 $ 0.2 $ 0.2  
Interest cost 9.0 8.5 18.0 17.0 3.8 3.3 7.6 6.6  
Expected asset return (12.1) (11.5) (24.2) (23.0)          
Amortized loss 1.3 2.4 2.6 4.8 0.2 0.2 0.4 0.4  
Amortized prior service cost (credit) 0 0.3 0 0.6 (0.7) (0.5) (1.4) (0.9)  
Net periodic benefit cost (credit) (0.9) 0.6 (1.8) 1.2          
Other postretirement benefit cost (credit)         3.4 3.1 6.8 6.3  
Defined benefit plan, estimated future employer contributions in current fiscal year                 $ 17