STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Dec. 10, 2020 shares	Feb. 28, 2019 goal	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 9.0	$ 6.3	$ 3.1
Stock-based compensation expense after tax			6.7	$ 4.8	$ 2.5
Weighted-average fair value of options granted (in dollars per share) | $ / shares				$ 10.44	$ 7.19
Aggregate intrinsic value of options exercised			0.8	$ 1.9	$ 1.8
Total unrecognized compensation cost of nonvested stock options			$ 0.7
Expected weighted-average period			1 year 10 months 6 days
Non-Vested Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 0.7
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 0.9
Weighted average fair value, granted (in dollars per share) | $ / shares			$ 49.76
Total compensation cost to be recognized			$ 2.1
Weighted average remaining contractual term			2 years
Granted (in shares) | shares			102,885
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Stock-based compensation expense recognized			$ 7.5
Weighted average fair value, granted (in dollars per share) | $ / shares			$ 49.24	$ 45.64	$ 37.52
Total compensation cost to be recognized			$ 11.5
Weighted average remaining contractual term			2 years 4 months 28 days
Total fair value, vested			$ 4.5	$ 1.9	$ 1.9
Granted (in shares) | shares			263,326
Executive Officers | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Performance achievement period		3 years
Stock options granted, vest in percentage per annum increments (as percent)		20.00%
Number of goals | goal		3
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%
Share-based Compensation Award, Tranche One | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			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
Share-Based Compensation Award, Tranche Two | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			50.00%
Share-Based Compensation Award, Tranche Three | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			75.00%
Share-Based Payment Arrangement, Tranche Four | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			100.00%
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			869,838
Stock Incentive 2018 Plan | BMBC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares added to plan due to business acquisition (in shares) | shares			261,709
Executive Leadership Team Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Executive Leadership Team Incentive Plan | Executive Officers | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Award requisite service period			3 years
Performance achievement period			3 years
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			$ 0.7
Granted (in shares) | shares	66,703