Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Dec. 10, 2020 shares	Feb. 28, 2019 goal	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 6.3	$ 3.1	$ 4.5
Stock-based compensation expense after tax			$ 4.8	$ 2.5	$ 3.4
Weighted-average fair value of options granted (in dollars per share) | $ / shares			$ 10.44	$ 7.19	$ 10.26
Aggregate intrinsic value of options exercised			$ 1.9	$ 1.8	$ 12.3
Total unrecognized compensation cost of nonvested stock options			$ 1.4
Expected weighted-average period			2 years 6 months 25 days
Non-Vested Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 1.1
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 5.3
Vesting period			4 years
Weighted average fair value, granted (in dollars per share) | $ / shares			$ 45.64	$ 37.52	$ 43.28
Total compensation cost to be recognized			$ 7.1
Weighted average remaining contractual term			2 years 4 months 24 days
Total fair value, vested			$ 1.9	$ 1.9	$ 1.5
Granted (in shares) | shares			119,714
Executive Officers | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 0.3
Vesting period		5 years
Number of goals | goal		3
Performance achievement period		3 years
Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vest in percentage per annum increments (as percent)			25.00%	25.00%	25.00%
Share-based Compensation Award, Tranche One | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period			5 years
Share-based Compensation Award, Tranche One | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period			7 years
Stock Incentive 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants under 2018 Plan (in shares) | shares			3,000,000
Shares reserved for future issuance (in shares) | shares			1,584,835
Beneficial Acquisition Success Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Beneficial Acquisition Success Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 1.1
Granted (in shares) | shares	66,703