Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income taxes
Federal, state and local tax provision	$ 2.0	$ 1.4	$ 2.3	$ 2.7