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Leases Supplemental Balance Sheet Information-Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Finance Lease, Right-of-Use Asset $ 100.0 $ 448.2
Operating Lease, Right-of-Use Asset 420.3  
Operating Lease, Liability, Current 40.9  
Operating Lease, Liability, Noncurrent 509.4  
Operating Lease, Liability $ 550.3  
Operating Lease, Weighted Average Remaining Lease Term 149 months  
Operating Lease, Weighted Average Discount Rate, Percent 4.00%  
Finance Lease, Liability, Current $ 8.0  
Finance Lease, Liability, Noncurrent 93.4  
Finance Lease, Liability $ 101.4 $ 568.0
Finance Lease, Weighted Average Remaining Lease Term 138 months  
Finance Lease, Weighted Average Discount Rate, Percent 3.50%