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Commitments and Contingencies (Lease Commitments) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating and Capital Leased Assets [Line Items] [Line Items]      
Expenses under real property, equipment, and sofware leases $ 49.0us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 47.6us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 47.6us-gaap_OperatingLeasesRentExpenseMinimumRentals
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Noncancelable Lease Commitments, Operating, 2015 43.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent [1],[2]    
Noncancelable Lease Commitments, Operating, 2016 41.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears [1],[2]    
Noncancelable Lease Commitments, Operating, 2017 37.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears [1],[2]    
Noncancelable Lease Commitments, Operating, 2018 34.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears [1],[2]    
Noncancelable Lease Commitments, Operating, 2019 30.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears [1],[2]    
Noncancelable Lease Commitments, Operating, Thereafter 225.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter [1],[2]    
Noncancelable Lease Commitments, Operating, Total minimum payments 412.9us-gaap_OperatingLeasesFutureMinimumPaymentsDue [1],[2]    
Other operating expenses excluded from future minimum lease obligations 24an_OperatingLeasesMaintenanceExpenseInsuranceAndRealEstateTaxes    
Minimum sublease income 3.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Noncancelable Lease Commitments, Capital, 2015 18.6us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent [1]    
Noncancelable Lease Commitments, Capital, 2016 5.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears [1]    
Noncancelable Lease Commitments, Capital, 2017 12.2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears [1]    
Noncancelable Lease Commitments, Capital, 2018 4.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears [1]    
Noncancelable Lease Commitments, Capital, 2019 28.8us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears [1]    
Noncancelable Lease Commitments, Capital, Thereafter 20.8us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter [1]    
Noncancelable Lease Commitments, Capital, Total minimum payments 90.5us-gaap_CapitalLeasesFutureMinimumPaymentsDue [1]    
Noncancelable Lease Commitments, Capital, Amounts representing interest (21.9)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments [1]    
Noncancelable Lease Commitments, Capital, Total $ 68.6us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments [1]    
[1] Amounts for capital and operating lease commitments do not include certain operating expenses such as maintenance, insurance, and real estate taxes. In 2014, these charges totaled approximately $24 million.
[2] Future minimum operating lease payments do not reflect future minimum sublease income of $3.0 million.