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Secured Borrowings - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2017
USD ($)
SpecialPurposeEntity
Dec. 31, 2016
USD ($)
SpecialPurposeEntity
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Number of special purpose entities formed to hold assets and issue secured borrowings | SpecialPurposeEntity 3 2      
Principal outstanding     $ 513.2   $ 515.1
Total deferred finance costs, net     $ 8.4   $ 9.0
Debt instrument, interest rate terms description     If the Company does not meet these repayment schedules, the base interest rates on the notes increase by the greater of (i) 5.00% and (ii) the amount by which the sum of the following exceeds the base interest rates on the notes: (a) the yield to maturity of 10-year U.S. treasury securities in November 2021, plus (b) 5.00%, plus (c) 2.73% for the Series A Notes or 3.70% for the Class B Notes. Additionally, in this event, the full amount of any tenant rental payments received on the assets transferred to the securitization would be used to repay principal.    
Percentage of increase in base interest rate upon non repayment of schedules     5.00%    
Debt instrument, base interest rates     5.00%    
Interest expense     $ 5.6 $ 5.7  
U.S. Treasury Securities          
Debt Instrument [Line Items]          
Debt instrument maturity term upon exceeding base interest rate     10 years    
Eldridge Industries, LLC          
Debt Instrument [Line Items]          
Notes issued $ 75.1        
Series 2016-1 Class A Notes          
Debt Instrument [Line Items]          
Debt instrument, frequency of periodic payment     monthly through November 2021    
Debt instrument, base interest rates     2.73%    
Series 2016-1 Class A Notes | Eldridge Industries, LLC          
Debt Instrument [Line Items]          
Notes issued   $ 263.5      
Series 2016-1 Class B Notes          
Debt Instrument [Line Items]          
Debt instrument, base interest rates     3.70%    
Series 2016-1 Class B Notes | Eldridge Industries, LLC          
Debt Instrument [Line Items]          
Notes issued   $ 17.3      
Series 2017-1 Class A Notes          
Debt Instrument [Line Items]          
Notes issued 232.4        
Series 2017-1 Class B Notes          
Debt Instrument [Line Items]          
Notes issued $ 15.7        
Series 2016-1 Notes          
Debt Instrument [Line Items]          
Debt instrument, payment terms description     The Series 2016-1 Notes mature in November 2046, but the terms of the Class A Notes require principal to be paid monthly through November 2021, with a balloon repayment at that time, and the terms of the Class B Notes require no monthly principal payments but require the full principal balance to be paid in November 2021.    
Debt instrument maturity month year     2046-11    
Weighted-average interest rate     4.51%    
Series 2017-1 Notes          
Debt Instrument [Line Items]          
Debt instrument maturity month year     2047-06    
Weighted-average interest rate     4.16%