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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rent Expense [Abstract]      
Rent expense, net $ 350.5 $ 355.1 $ 354.1
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]      
Operating Leases, Minimum lease payments, 2018 317.8    
Operating Leases, Minimum lease payments, 2019 249.7    
Operating Leases, Minimum lease payments, 2020 198.3    
Operating Leases, Minimum lease payments, 2021 169.4    
Operating Leases, Minimum lease payments, 2022 144.2    
Operating Leases, Minimum lease payments, Thereafter 627.2    
Operating Leases, Total 1,706.6    
Operating Leases, Minimum lease payments, Sublease rent (19.0)    
Operating Leases, Minimum lease payments, Net operating lease payments 1,687.6    
Future Minimum Lease Payments Under Non-Cancelable Capital Leases [Abstract]      
Capital Leases, Minimum lease payments, 2018 34.5    
Capital Leases, Minimum lease payments, 2019 30.0    
Capital Leases, Minimum lease payments, 2020 26.4    
Capital Leases, Minimum lease payments, 2021 17.1    
Capital Leases, Minimum lease payments, 2022 6.4    
Capital Leases, Minimum lease payments, Thereafter 3.1    
Capital Leases, Total 117.5    
Capital Leases, Minimum lease payments, Interest component (7.0)    
Capital Leases, Minimum lease payments, Present value of minimum capital lease payments 110.5    
Property Under Capital Lease and Capital Lease Obligations [Abstract]      
Property under capital lease, Cost 229.3 184.8  
Property under capital lease, Accumulated depreciation (121.0) (110.2)  
Property under capital lease 108.3 74.6  
Capital lease obligations, Current 31.6 24.2  
Capital lease obligations, Long-term 78.9 49.8  
Capital lease obligations 110.5 74.0  
Property under capital lease, Depreciation expense 31.1 27.2 26.5
Office [Member]      
Rent Expense [Abstract]      
Office base rent 336.7 339.7 342.5
Third party sublease rent (6.3) (5.6) (11.0)
Rent expense, net 330.4 334.1 331.5
Equipment [Member]      
Rent Expense [Abstract]      
Rent expense, net $ 20.1 $ 21.0 $ 22.6