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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating Lease, Expense $ 40.2  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 25.7  
Finance Lease, Liability 11.5  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 116.9  
Lessee, Operating Lease, Liability, Payments, Due Year Two 140.4  
Lessee, Operating Lease, Liability, Payments, Due Year Three 120.9  
Lessee, Operating Lease, Liability, Payments, Due Year Four 88.5  
Lessee, Operating Lease, Liability, Payments, Due Year Five 71.6  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 223.9  
Lessee, Operating Lease, Liability, Payments, Due 762.2  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 94.3  
Operating Lease, Liability $ 667.9  
Operating Lease, Weighted Average Remaining Lease Term 6 years 9 months 18 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.90%  
Operating Leases, Future Minimum Payments Due, Next Twelve Months   $ 167.8
Operating Leases, Future Minimum Payments, Due in Two Years   153.1
Operating Leases, Future Minimum Payments, Due in Three Years   132.3
Operating Leases, Future Minimum Payments, Due in Four Years   99.4
Operating Leases, Future Minimum Payments, Due in Five Years   81.0
Operating Leases, Future Minimum Payments, Due Thereafter   257.3
Operating Leases, Future Minimum Payments Due   $ 890.9