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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Rent Expense [Abstract]      
Rent expense, net $ 354.1 $ 389.8 $ 402.4
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]      
Operating Leases, Minimum lease payments, 2016 305.0    
Operating Leases, Minimum lease payments, 2017 224.5    
Operating Leases, Minimum lease payments, 2018 176.0    
Operating Leases, Minimum lease payments, 2019 147.1    
Operating Leases, Minimum lease payments, 2020 122.7    
Operating Leases, Minimum lease payments, Thereafter 419.4    
Operating Leases, Minimum lease payments 1,394.7    
Operating Leases, Minimum lease payments, Sublease rent (10.4)    
Operating Leases, Minimum lease payments, Net rent 1,384.3    
Future Minimum Lease Payments Under Non-Cancelable Capital Leases [Abstract]      
Capital Leases, Minimum lease payments, 2016 23.7    
Capital Leases, Minimum lease payments, 2017 16.1    
Capital Leases, Minimum lease payments, 2018 9.1    
Capital Leases, Minimum lease payments, 2019 5.0    
Capital Leases, Minimum lease payments, 2020 3.3    
Capital Leases, Minimum lease payments, Thereafter 2.8    
Capital Leases, Minimum lease payments 60.0    
Capital Leases, Minimum lease payments, Interest component (2.0)    
Capital Leases, Minimum lease payments, Present value of minimum lease payments 58.0    
Property Under Capital Lease and Capital Lease Obligations [Abstract]      
Property under capital lease, Cost 154.6 146.3  
Property under capital lease, Accumulated depreciation (100.4) (90.6)  
Property under capital lease 54.2 55.7  
Capital lease obligations, Current 22.8 23.2  
Capital lease obligations, Long-term 35.2 34.0  
Capital lease obligations 58.0 57.2  
Property under capital lease, Depreciation expense 26.5 26.1 26.4
Office [Member]      
Rent Expense [Abstract]      
Office base rent 342.5 373.1 379.9
Third party sublease rent (11.0) (11.2) (10.6)
Rent expense, net 331.5 361.9 369.3
Equipment [Member]      
Rent Expense [Abstract]      
Rent expense, net $ 22.6 $ 27.9 $ 33.1