Stock-Based Compensation - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options
Outstanding at beginning of period (in shares)	155,591
Granted (in shares)	0	0	0
Exercised (in shares)	(58,863)
Forfeited or expired (in shares)	0
Outstanding at end of period (in shares)	96,728	155,591
Expected to vest at end of period (in shares)	0
Exercisable at end of period (in shares)	96,728
Weighted Average Exercise Price
Outstanding at the beginning of the period (in USD per share)	$ 41.38
Granted (in USD per share)	0
Exercised (in USD per share)	37.86
Forfeited or expired (in USD per share)	0
Outstanding at the end of the period (in USD per share)	43.48	$ 41.38
Expected to Vest at end of period (in USD per share)	0
Exercisable at end of period (in USD per share)	$ 43.48
Weighted-average remaining contractual term, exercisable at end of period	1 year 2 months 12 days
Aggregate intrinsic value, exercisable at end of period	$ 10.9

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.