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Summary of Significant Accounting Policies (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Jan. 01, 2019
USD ($)
Operating Lease, Right-of-Use Asset $ 1,379.3 $ 1,574.4   $ 1,421.1
Operating Lease, Liability 1,709.5     $ 1,544.4
Revenue, remaining performance obligation, amount $ 654.0      
Retirement of treasury stock, amount     $ 0.0  
ERP Systems, Useful Life 10      
Minimum Remaining Lease Term 1 year      
Maximum Remaining Lease Term 19 years      
Leasehold Improvements, Useful Life the shorter of the useful life or the remaining lease term      
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test 12      
Foreign Currency Transaction pre-tax Gain (Loss) $ (1.2) $ 5.3 $ (5.6)  
Minimum        
Furniture and Equipment, Useful Life 3 years      
Buildings, Useful Life 10 years      
Other Internal Use Software, Useful Life 3      
Identifiable Intangible Assets, Useful Life 7 years      
Maximum        
Furniture and Equipment, Useful Life 7 years      
Buildings, Useful Life 35 years      
Other Internal Use Software, Useful Life 7      
Identifiable Intangible Assets, Useful Life 15 years      
Common Stock [Member]        
Retirement of treasury stock, shares | shares     8.1  
Retirement of treasury stock, amount     $ (0.8)  
Treasury Stock [Member]        
Retirement of treasury stock, amount     176.1  
Additional Paid-in Capital [Member]        
Retirement of treasury stock, amount     $ (175.3)