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Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Pension Expense     $ 5.0 $ 3.5
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 1.0 $ 0.9 2.0 1.9
Interest cost 3.4 3.6 6.8 7.3
Expected return on plan assets (3.8) (4.2) (7.6) (8.5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.1 0.0 0.2 0.0
Defined Benefit Plan, Amortization of Gains (Losses) 1.8 1.4 3.6 2.8
Net periodic pension cost $ 2.5 $ 1.7 5.0 $ 3.5
Pension Contributions     1.4  
Maximum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year     5.0  
Minimum [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year     $ 2.0