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Summary of Significant Accounting Policies (Net Lease Sale) (Details) $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Mar. 31, 2022 USD ($) item lease property	Jun. 30, 2021 lease	Mar. 31, 2022 USD ($) property	Jun. 30, 2022 USD ($) property
Discontinued operations
Number of ground leases entered into | lease		2
Third Party Buyer - Net Lease Properties
Discontinued operations
Number of properties sold | property	3
Consideration for sale of properties	$ 122.0
Number of ground leases entered into | lease	3
Net Lease Venture
Discontinued operations
Equity interest in joint ventures	51.90%		51.90%
Net Lease Venture II
Discontinued operations
Equity interest in joint ventures	51.90%		51.90%
Discontinued Operations, Disposed of by Sale | Net Lease Sale
Discontinued operations
Aggregate sales price	$ 3,070.0		$ 3,070.0
Recognized gain on disposal	$ 663.7
Aggregate square footage of net lease assets	18.3		18.3
Number of joint ventures with properties included in Net Lease Sale | item	2
Mortgage indebtedness on lease assets	$ 702.0		$ 702.0
Amount of net cash consideration retained after settlement of obligations	$ 1,200.0		1,200.0
Discontinued Operations, Disposed of by Sale | Two Net Lease Properties
Discontinued operations
Aggregate sales price				$ 33.9
Recognized gain on disposal			$ 23.9
Number of properties sold | property			2	2

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