Revenue from Contracts with Customers - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue from Contracts with Customers
Contract liability, Beginning of period	$ 2.9	$ 3.3	$ 3.3	$ 2.9
Deferral	2.9	3.3	9.1	9.1
Revenue recognized	(3.0)	(3.2)	(9.6)	(8.6)
Contract liability, End of period	2.8	3.4	2.8	3.4
Current contract liabilities	2.5		2.5		$ 2.9
Non-current contract liabilities	0.3		0.3		0.4
Total contract liabilities	$ 2.8	$ 3.4	$ 2.8	$ 3.4	$ 3.3