Equity Incentive Awards - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Options forfeited (in shares)		0	0	0
Options expired (in shares)		0	0	0
Shares Subject To Options
Beginning balance (in shares)		57,590	41,500	47,100
Options exercised (in shares)		0	0	(5,600)
Options issued (in shares)	16,185	16,185	16,090
Ending balance (in shares)		73,775	57,590	41,500	47,100
Exercisable at December 31, 2021 (in shares)		57,450
Weighted Average Exercise Price Per Share
Beginning balance (in usd per share)		$ 47.96	$ 40.65	$ 36.95
Options exercised (in usd per share)				9.43
Options issued (in usd per share)	$ 68.74	68.74	66.81
Ending balance (in usd per share)		52.52	$ 47.96	$ 40.65	$ 36.95
Exercisable at December 31, 2021 (in usd per share)		$ 48.08
Weighted Average Outstanding Contractual Life (in years)
Balance outstanding, Weighted Average Outstanding Contractual Life (in years)		6 years 10 months 24 days	7 years 2 months 12 days	7 years 3 months 18 days	7 years 3 months 18 days
Exercisable at December 31, 2021 (in years)		6 years 3 months 18 days
Average Intrinsic Value (in millions)
Beginning balance		$ 0.9	$ 1.2	$ 0.5
Options exercised				0.2
Ending balance		2.6	$ 0.9	$ 1.2	$ 0.5
Exercisable at December 31, 2021		$ 2.3