Real Estate, net and Real Estate Held for Sale - Depreciation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Real Estate [Abstract]
Depreciation expense on real estate	$ 10.6	$ 18.1	$ 32.0	$ 58.7