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Stock Based Compensation - Restricted stock units (Details) - Restricted stock units $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Stock-based compensation
Beginning balance | shares	358,825	90,006
Granted | shares	670,700	348,288
Vested | shares	(151,555)	(62,355)
Forfeited | shares	(51,822)	(17,114)
Ending balance | shares	826,148	358,825
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 33.04	$ 34.66
Weighted Average Grant Date Fair Value, Granted | $ / shares	39.11	32.51
Weighted Average Grant Date Fair Value, Vested | $ / shares	32.76	32.61
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	36.68	32.33
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 37.79	$ 33.04
Compensation expense
Unamortized compensation expense related to unvested restricted stock units | $	$ 24.8	$ 8.5
Period to recognize unamortized compensation expense	1 year 11 months 12 days

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