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, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 12.7	$ 10.0	$ 9.0
Stock-based compensation expense after tax			$ 9.6	$ 7.6	$ 6.7
Granted (in shares) | shares			0	0	0
Aggregate intrinsic value of options exercised			$ 0.8	$ 0.5	$ 0.8
Total unrecognized compensation cost of nonvested stock options			$ 0.1
Expected weighted-average period (in years)			3 months 10 days
Non-Vested Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized			$ 0.2	0.3	0.7
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period (in years)			3 years
Performance achievement period (in years)			3 years
Stock-based compensation expense recognized			$ 3.4	$ 1.6	$ 0.9
Weighted average fair value, granted (in dollars per share) | $ / shares			$ 42.39	$ 49.69	$ 49.76
Total compensation cost to be recognized			$ 10.7
Weighted average remaining contractual term (in years)			1 year 8 months 23 days
Granted (in shares) | shares			129,802
Performance Stock Units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)			25.00%
Performance Stock Units | Share-Based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)			50.00%
Performance Stock Units | Share-Based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)			75.00%
Performance Stock Units | Share-Based Payment Arrangement, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)			100.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Stock-based compensation expense recognized			$ 8.2	$ 6.3	$ 7.5
Weighted average fair value, granted (in dollars per share) | $ / shares			$ 44.93	$ 47.68	$ 49.24
Total compensation cost to be recognized			$ 11.8
Weighted average remaining contractual term (in years)			1 year 10 months 20 days
Total fair value, vested			$ 7.0	$ 5.1	$ 4.5
Granted (in shares) | shares			214,816
Executive Officers | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		5 years
Performance achievement period (in years)		3 years
Stock-based compensation expense recognized			$ 0.1	$ 0.1
Number of goals | goal		3
Stock options granted, vest in percentage per annum increments (as percent)		20.00%
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			6,261,709
Shares reserved for future issuance (in shares) | shares			2,321,904
Executive Leadership Team Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			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 (in years)			3 years
Award requisite service period (in years)			3 years
Performance achievement period (in years)			3 years
Beneficial Acquisition Success Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Beneficial Acquisition Success Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	66,703
BMBC | Stock Incentive 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares added to plan due to business acquisition (in shares) | shares			261,709