Revenue from Contracts with Customers - Contract Balances (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) item
Revenue from Contracts with Customers
Signing bonuses received from vendors, in prior years | item					2
Contract liabilities	$ 2.1		$ 2.1		$ 2.7
Increase in recognized revenues and contract liabilities	0.2	$ 0.2	0.6	$ 0.7
Change in contract liabilities due to changes in transaction price estimates	$ 0.0	$ 0.0	$ 0.0	$ 0.0