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Retirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Pension Plans    
Defined Benefit Plans, Net Periodic Benefit Cost [Abstract]    
Service cost $ 1.6 $ 1.8
Interest cost 3.0 2.7
Expected return on assets (2.9) (2.8)
Other 0.3 1.1
Total benefit cost 2.0 2.8
Contributions to pension plans 1.1  
Estimated employer contribution to pension plans during current fiscal year 11.6  
Retiree Health Care Plan    
Defined Benefit Plans, Net Periodic Benefit Cost [Abstract]    
Service cost 0.0 0.0
Interest cost 0.2 0.2
Expected return on assets 0.0 0.0
Other (0.2) (0.2)
Total benefit cost 0.0 $ 0.0
Contributions to retiree health care plan $ 0.3