Description of the Business and Significant Accounting Policies (Senior Credit Facility) (Details) - Revolving Credit Facility - Unsecured Loans - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Jul. 19, 2023
Senior Credit Facility
Maximum borrowing capacity of credit facility		$ 1,200.0
Additional amount by which facility size can be increased	$ 500.0
Minimum
Senior Credit Facility
Unused commitment fee (as a percent)	0.11%
Minimum | Secured Overnight Financing Rate ("SOFR")
Senior Credit Facility
Interest rate added to the base rate (as a percent)	1.00%
Maximum
Senior Credit Facility
Unused commitment fee (as a percent)	0.275%
Maximum | Secured Overnight Financing Rate ("SOFR")
Senior Credit Facility
Interest rate added to the base rate (as a percent)	1.75%