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Leases Components of Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating Lease Cost $ 81.7 $ 98.4  
Finance Lease, Right-of-Use Asset, Amortization 37.7 28.3  
Finance Lease, Interest Expense 13.3 15.2  
Short-term Lease Cost 3.1 10.5  
Variable Lease Cost 21.8 21.5  
Total Lease Cost 157.6 173.9  
Operating Leases, Rent Expense 226.9 249.1 $ 270.3
Operating Lease, Payments 96.6 107.9  
Finance Lease, Interest Payment on Liability 8.4 10.7  
Finance Lease, Principal Payments 46.9 41.3  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 22.4 56.0  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 36.4 $ 88.2  
Operating Lease, Weighted Average Remaining Lease Term 4 years 4 months 24 days    
Finance Lease, Weighted Average Remaining Lease Term 3 years 9 months 18 days    
Operating Lease, Weighted Average Discount Rate, Percent 4.80%    
Finance Lease, Weighted Average Discount Rate, Percent 3.80%