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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating Lease, Expense $ 44.0 $ 124.9  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability   135.6  
Finance Lease, Liability 11.7 11.7  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 44.1 44.1  
Lessee, Operating Lease, Liability, Payments, Due Year Two 175.7 175.7  
Lessee, Operating Lease, Liability, Payments, Due Year Three 156.2 156.2  
Lessee, Operating Lease, Liability, Payments, Due Year Four 120.0 120.0  
Lessee, Operating Lease, Liability, Payments, Due Year Five 95.0 95.0  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 272.1 272.1  
Lessee, Operating Lease, Liability, Payments, Due 863.1 863.1  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 104.8 104.8  
Operating Lease, Liability $ 758.3 $ 758.3  
Operating Lease, Weighted Average Remaining Lease Term 6 years 6 months 6 years 6 months  
Operating Lease, Weighted Average Discount Rate, Percent 3.80% 3.80%  
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