Stock Compensation - PBRSUs (Details) - PBRSUs - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021
Stock compensation
Performance period		2 years
Stock-based compensation expense	$ 0.1	$ 0.1
Number of PBRSUs
Outstanding at the beginning of period (in shares)		0
Granted (in shares)		64,200
Forfeited (in shares)		(18,900)
Outstanding and unvested at the ending of period (in shares)	45,300	45,300
Weighted-Average Fair Value Per Share
Outstanding and at the beginning of period (in dollars per share)		$ 0
Granted (in dollars per share)		22.52
Forfeited (in dollars per share)		22.52
Outstanding and unvested at the at the end of the period (in dollars per share)	$ 22.52	$ 22.52

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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