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Leases Balance Sheet Lease Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets    
Right-of-use assets $ 161.7 $ 0.0
Property and equipment, net(a) 33.0  
Total leased assets 194.7  
Current    
Current maturities of operating lease liabilities 26.1 0.0
Current maturities of long-term debt and financing obligations 19.6  
Non-current    
Operating lease liabilities 138.1 $ 0.0
Long-term debt, net 14.0  
Total lease liabilities $ 197.8  
Weighted average remaining lease term    
Operating leases 7 years 8 months  
Finance leases 3 years 3 months  
Weighted Average Discount Rate [Abstract]    
Operating leases 4.25%  
Finance leases 3.81%  
FinanceLeaseAsset [Member]    
Weighted Average Discount Rate [Abstract]    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 53.1