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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating Lease, Expense $ 40.7 $ 80.9  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability   80.6  
Finance Lease, Liability 11.0 11.0  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 79.5 79.5  
Lessee, Operating Lease, Liability, Payments, Due Year Two 152.6 152.6  
Lessee, Operating Lease, Liability, Payments, Due Year Three 132.8 132.8  
Lessee, Operating Lease, Liability, Payments, Due Year Four 100.9 100.9  
Lessee, Operating Lease, Liability, Payments, Due Year Five 80.9 80.9  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 236.3 236.3  
Lessee, Operating Lease, Liability, Payments, Due 783.0 783.0  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 97.0 97.0  
Operating Lease, Liability $ 686.0 $ 686.0  
Operating Lease, Weighted Average Remaining Lease Term 6 years 9 months 18 days 6 years 9 months 18 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.90% 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