Summary of Significant Accounting Policies - Basis of Presentation to Real Estate Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Maximum exposure to losses	$ 25.9
Depreciation expense from operation	45.6	$ 35.7
Real estate cost capitalized excluding interest cost	5.5	4.5
Real estate interest cost capitalized incurred	$ (7.0)	(8.1)
Real Property
Summary Of Significant Accounting Policies [Line Items]
Useful life of property	40 years
Real Property | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property	20 years
Real Property | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property	40 years
Leasehold Improvements | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of property	20 years
Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation	$ 42.7	32.3
Non-Real Estate Assets
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense from operation	$ 2.9	$ 3.4