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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Pension Plans, Defined Benefit [Member]
Mar. 31, 2013
Pension Plans, Defined Benefit [Member]
Mar. 31, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Mar. 31, 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 $ 0.1 $ 0.1  
Interest cost 9.0 8.5 3.8 3.3  
Expected asset return (12.1) (11.5)      
Amortized loss 1.3 2.4 0.2 0.2  
Amortized prior service cost (credit) 0 0.3 (0.7) (0.4)  
Net periodic benefit cost (credit) (0.9) 0.6      
Other postretirement benefit expense     3.4 3.2  
Defined benefit plan, estimated future employer contributions in current fiscal year         $ 17