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Leases (Details)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
USD ($)
Leases [Abstract]    
Finance Lease, Liability   $ 568.0
Finance Lease, Right-of-Use Asset   $ 448.2
Operating Lease, Weighted Average Remaining Lease Term 19  
Lessee, Operating Lease, Renewal Term 5  
Lessee, Operating Lease, Option to Terminate 12  
Lessee, Operating Lease, Term of Contract 12  
Finance Lease, Weighted Average Remaining Lease Term 144  
Lessee, Finance Lease, Discount Rate 3.51%  
Lease Term Recognition-Balance Sheet 12