Fair Value (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measurements [Line Items]
Transfer between Level 2 and Level 3	$ 0	$ 0
Maximum [Member]
Fair Value Measurements [Line Items]
Investments measured at net asset value based on an ownership interest in partners'	2.00%	2.00%
Fair Value Measured Using NAV [Member]
Fair Value Measurements [Line Items]
Investments measured at fair value using net asset value	$ 114,600,000	$ 128,200,000
Investment, Type [Extensible Enumeration]	Partnership Interest [Member]	Partnership Interest [Member]
Level 3 [Member]
Fair Value Measurements [Line Items]
Investments measured at fair value using net asset value	$ 3,800,000	$ 3,600,000
Liabilities held	$ 0	$ 0