Other Investments (Net Lease Venture II) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity interest	51.90%	51.90%
Net Lease Venture II | Office laboratory property
Schedule of Equity Method Investments [Line Items]
Payments to acquire property	$ 0.6
Net Lease Venture II | Office laboratory property | Liabilities associated with real estate held for sale and classified as discontinued operations
Schedule of Equity Method Investments [Line Items]
Mortgage liability assumed	$ 44.4
Net Lease Venture II
Schedule of Equity Method Investments [Line Items]
Equity interest	51.90%	51.90%
Net Lease Venture II | Net income from discontinued operations
Schedule of Equity Method Investments [Line Items]
Management fee revenue from related party		$ 1.7	$ 1.5	$ 1.5