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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2014 $ 44.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2015 36.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2016 30.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2017 25.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2018 18.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
2019 and thereafter 44.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 200.4us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Rent Expense, Net [Abstract]      
Rent expense under operating leases $ 36.9us-gaap_LeaseAndRentalExpense $ 33.2us-gaap_LeaseAndRentalExpense $ 22.8us-gaap_LeaseAndRentalExpense