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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Rent Expense [Abstract]      
Rent expense, net $ 355.1 $ 354.1 $ 389.8
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]      
Operating Leases, Minimum lease payments, 2017 299.5    
Operating Leases, Minimum lease payments, 2018 232.1    
Operating Leases, Minimum lease payments, 2019 197.4    
Operating Leases, Minimum lease payments, 2020 157.5    
Operating Leases, Minimum lease payments, 2021 131.0    
Operating Leases, Minimum lease payments, Thereafter 550.9    
Operating Leases, Minimum lease payments 1,568.4    
Operating Leases, Minimum lease payments, Sublease rent (7.8)    
Operating Leases, Minimum lease payments, Net rent 1,560.6    
Future Minimum Lease Payments Under Non-Cancelable Capital Leases [Abstract]      
Capital Leases, Minimum lease payments, 2017 26.2    
Capital Leases, Minimum lease payments, 2018 19.3    
Capital Leases, Minimum lease payments, 2019 14.8    
Capital Leases, Minimum lease payments, 2020 11.1    
Capital Leases, Minimum lease payments, 2021 5.7    
Capital Leases, Minimum lease payments, Thereafter 1.3    
Capital Leases, Minimum lease payments 78.4    
Capital Leases, Minimum lease payments, Interest component (4.4)    
Capital Leases, Minimum lease payments, Present value of minimum lease payments 74.0    
Property Under Capital Lease and Capital Lease Obligations [Abstract]      
Property under capital lease, Cost 184.8 154.6  
Property under capital lease, Accumulated depreciation (110.2) (100.4)  
Property under capital lease 74.6 54.2  
Capital lease obligations, Current 24.2 22.8  
Capital lease obligations, Long-term 49.8 35.2  
Capital lease obligations 74.0 58.0  
Property under capital lease, Depreciation expense 27.2 26.5 26.1
Office [Member]      
Rent Expense [Abstract]      
Office base rent 339.7 342.5 373.1
Third party sublease rent (5.6) (11.0) (11.2)
Rent expense, net 334.1 331.5 361.9
Equipment [Member]      
Rent Expense [Abstract]      
Rent expense, net $ 21.0 $ 22.6 $ 27.9