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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 [Abstract]      
Rental expense attributed to operating leases $ 34.8us-gaap_LeaseAndRentalExpense $ 34.3us-gaap_LeaseAndRentalExpense $ 38.1us-gaap_LeaseAndRentalExpense
Future minimum rental obligations under non-cancelable operating leases      
2014 42.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2015 33.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2016 23.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2017 17.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2018 14.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 23.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 154.4us-gaap_OperatingLeasesFutureMinimumPaymentsDue