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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating Lease, Expense $ 187.3 $ 170.5  
Variable and Short-Term Operating Lease, Expense 36.0 33.3  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 94.3 $ 310.7  
Finance Lease, Liability $ 13.7    
Operating Lease, Weighted Average Remaining Lease Term 7 years 1 month 6 days    
Total rent expense including office space and other rentals     $ 195.3
Lessee, Operating Lease, Liability, Payments, Due Year One $ 191.6    
Lessee, Operating Lease, Liability, Payments, Due Year Two 156.4    
Lessee, Operating Lease, Liability, Payments, Due Year Three 127.9    
Lessee, Operating Lease, Liability, Payments, Due Year Four 107.7    
Lessee, Operating Lease, Liability, Payments, Due Year Five 85.7    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 293.7    
Lessee, Operating Lease, Liability, Payments, Due 963.0    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 113.4    
Operating Lease, Liability $ 849.6    
Operating Lease, Weighted Average Discount Rate, Percent 3.50%