Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income taxes
Federal, state and local tax provision	$ 2.5	$ 0.1	$ 5.2	$ 2.2