Federal Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Minimum distribution percentage of annual taxable income to qualify as REIT	90.00%
Maximum percentage of total assets consisting of securities of TRS	20.00%
Deferred tax assets, net	$ 0.0	$ 0.9
Deferred tax assets, applicable reserves	2.6	1.7
Deferred tax assets, capital loss carryforwards	0.1	0.1
Deferred tax assets, operating loss carryforwards	$ 2.5	$ 2.5
Minimum percentage of unrealized deferred tax asset required for qualification of valuation allowance	50.00%
Deferred tax assets valuation allowance	$ 0.9