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Lease Obligations (Schedule of Future Minimum Operating Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 $ 41.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 34.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 27.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 21.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 15.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and thereafter 34.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 173.7us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Rent Expense, Net [Abstract]      
Rent expense under operating leases $ 39.6us-gaap_LeaseAndRentalExpense $ 36.9us-gaap_LeaseAndRentalExpense $ 33.2us-gaap_LeaseAndRentalExpense