Related Party Transactions and Arrangements - Related Party Agreements (Details) - Spirit MTA REIT - Affiliated entity - USD ($)
$ in Millions
2 Months Ended
May 31, 2018
Jul. 30, 2018
Jun. 30, 2018
Related Party Transaction [Line Items]      
Loan receivable to related party $ 3.0    
Loan receivable maturity 60 days    
Due from related parties     $ 3.2
Due to related parties     $ 1.5
Subsequent Event      
Related Party Transaction [Line Items]      
Payment of receivable within 60 days   $ 2.0