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Employee Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6.0 $ 5.8 $ 11.8 $ 11.6
Interest cost 11.5 11.5 23.0 22.9
Expected return on plan assets (13.3) (12.7) (26.6) (25.4)
Net amortization of unrecognized amounts, Prior service cost 1.4 1.6 2.8 3.3
Net amortization of unrecognized amounts, Actuarial loss 2.2 0.2 4.3 0.3
Net periodic benefit cost 7.8 6.4 15.3 12.7
Pension Contributions [Abstract]        
Contributions to pension plans in 2015     0.8  
Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 0.4 0.8 0.8
Interest cost 0.3 0.3 0.6 0.6
Net amortization of unrecognized amounts, Prior service cost 0.0 0.0 0.0 (0.1)
Net amortization of unrecognized amounts, Actuarial loss 0.0 0.0 0.1 0.1
Net periodic benefit cost $ 0.7 $ 0.7 $ 1.5 $ 1.4