Revenue From Contracts With Customers - Contract Balances (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 Contract with Customer [Abstract]
Contract assets	$ 0.7		$ 0.7		$ 0.6
Credit losses on contract assets	0.0	$ 0.0	0.0	$ 0.0
Contract liabilities	20.8		20.8		8.7
Revenue recognized	2.7	4.0	7.0	6.7
Deferred contract costs	18.5		18.5		$ 3.3
Amortization of deferred contract costs	$ 8.5	$ 11.7	$ 19.7	$ 31.6