Variable Interest Entities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Affordable housing tax credits and other tax benefits	$ 28,300,000	$ 25,700,000	$ 56,600,000	$ 48,400,000
Investment company, voluntary fee waived	2,300,000	$ 8,600,000	4,300,000	$ 59,300,000
Contractual obligation to provide financial support	0		0
Fair value investments, seed capital investments					$ 19,900,000
Unfunded commitments	$ 0		$ 0		$ 0