Customer Liabilities - Schedule of Customer Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Accrued service costs, current	$ 32.3	$ 12.2
Collections payable to clients, current	3.0	4.6
Refund liabilities, current	3.8	2.9
Deferred revenue (contract liabilities), current	10.3	12.3
Current portion of customer liabilities	49.4	32.0
Deferred revenue (contract liabilities), non-current	18.7	16.3
Non-current portion of customer liabilities	18.7	16.3
Total customer liabilities	$ 68.1	$ 48.3