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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Operating Lease, Expense $ 170.5    
Variable and Short-Term Operating Lease, Expense 33.3    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 310.7    
Finance Lease, Liability $ 11.8    
Operating Lease, Weighted Average Remaining Lease Term 7 years 4 months 24 days    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 181.6    
Minimum future lease payments due [Abstract]      
2019   $ 167.8  
2020   153.1  
2021   132.3  
2022   99.4  
2023   81.0  
Thereafter   257.3  
Minimum lease payments   890.9  
Total rent expense including office space and other rentals   $ 195.3 $ 197.3
Lessee, Operating Lease, Liability, Payments, Due Year Two 169.5    
Lessee, Operating Lease, Liability, Payments, Due Year Three 137.8    
Lessee, Operating Lease, Liability, Payments, Due Year Four 113.8    
Lessee, Operating Lease, Liability, Payments, Due Year Five 91.7    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 342.2    
Lessee, Operating Lease, Liability, Payments, Due 1,036.6    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 132.0    
Operating Lease, Liability $ 904.6    
Operating Lease, Weighted Average Discount Rate, Percent 3.60%