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Stock-based Compensation - Restricted Stock Units (Details) - RSUs - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period for vesting	4 years
Vesting percentage	25.00%
Total RSUs
Outstanding at the beginning of the period (in shares)	1,737
Granted (in shares)	1,276
Forfeited / Canceled (in shares)	(243)
Vested (in shares)	(683)
Outstanding at the end of the period (in shares)	2,087	1,737
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 10.13
Weighted-average fair value per option granted (in dollars per share)	21.10	$ 8.88	$ 10.66
Forfeited (in dollars per share)	12.74
Vested (in dollars per share)	10.68
Outstanding at the end of the period (in dollars per share)	$ 16.35	$ 10.13
Aggregate intrinsic value, vested	$ 7.3	$ 6.1	$ 7.3
New Century Health
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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