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Financing Obligations - Narrative (Details)
$ in Millions
12 Months Ended
Oct. 10, 2017
property
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Leases [Abstract]        
Sale leaseback transaction, number of properties | property 42 2    
Sale Leaseback Transaction, Gross Proceeds   $ 6.4 $ 119.5 $ 0.0
Sale leaseback transaction, lease term, period (in years) 20 years      
Sale leaseback transaction, renewal term, number of additional terms   5    
Sale leaseback transaction, length of each additional period (in years)   5 years    
Deferred finance costs, issuance costs   $ 2.7    
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization Expense, Period Increase (Decrease)   $ 0.2 $ 0.1