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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Future minimum payments under operating leases      
2015 $ 16.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 16.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 14.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 12.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 11.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and beyond 25.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Future minimum rentals to be received under operating subleases      
2015 0.1us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent    
2016 0.1us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears    
2017 0.1us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears    
2018 0.2us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears    
2019 0.1us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears    
Rent expense 17.4us-gaap_OperatingLeasesRentExpenseNet 15.2us-gaap_OperatingLeasesRentExpenseNet 19.5us-gaap_OperatingLeasesRentExpenseNet
Future minimum payments under capital leases net of leasehold improvement allowances      
2015 0.6us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
2016 2.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
2017 3.5us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
2018 3.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
2019 2.9us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and beyond 18.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Capital lease obligations imputed interest $ 6.5mgln_CapitalLeaseObligationsImputedInterest