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Lease Obligations (Schedule of Future Minimum Capital Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2015 $ 4.6us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent  
2016 4.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
2017 3.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
2018 1.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
2019 0.6us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears  
2020 and thereafter 0.9us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter  
Total minimum payments 14.8us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Less: amounts representing interest (0.9)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments  
Present value of minimum payments 13.9us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments  
Less: current portion (4.2)us-gaap_CapitalLeaseObligationsCurrent (7.0)us-gaap_CapitalLeaseObligationsCurrent
Long-term capital lease obligations $ 9.7us-gaap_CapitalLeaseObligationsNoncurrent $ 6.5us-gaap_CapitalLeaseObligationsNoncurrent