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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases, Operating [Abstract]      
2015 $ 148.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 132.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 125.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 115.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 99.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 274.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total minimum payments required 896.1us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Lease expense $ 192.5us-gaap_LeaseAndRentalExpense $ 185.9us-gaap_LeaseAndRentalExpense $ 153.3us-gaap_LeaseAndRentalExpense