SHARE-BASED AWARDS - SUMMARY (Details) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) plan shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Share-based expense (net of estimated forfeitures)
Share-based compensation expense	$ 23.8	$ 18.3	$ 19.3
Tax benefit realized upon stock vesting	6.1	10.6	8.0
Fair value of stock vested	27.8	$ 44.0	$ 33.5
Non-vested restricted stock units and performance-based equity awards
Share-based expense (net of estimated forfeitures)
Unrecognized compensation cost	$ 24.8
Unrecognized compensation cost, weighted average period for recognition	1 year 8 months 12 days
2016 Plan
SHARE-BASED AWARDS
Common stock initially available for future issuance (in shares) | shares	4,350
Additional shares authorized for issuance | shares	0
Number of separate incentive compensation programs | plan	4
Number of share based compensation plans within the entity's incentive compensation programs | plan	3
2016 Plan | Discretionary Grant Program
SHARE-BASED AWARDS
Minimum exercise price as a percentage of fair market value of common stock	100.00%
2016 Plan | Time Based Restricted Stock Units | Stock Issuance Program
SHARE-BASED AWARDS
Vesting period of awards granted	3 years
2016 Plan | Time Based Restricted Stock Units | Automatic Grant Program
SHARE-BASED AWARDS
Vesting period of awards granted	1 year
2016 Plan | Performance Based Restricted Stock Units | Stock Issuance Program
SHARE-BASED AWARDS
Vesting period of awards granted	3 years
2016 Plan | Restricted Stock Units
Activity in the entity's stock option plans
Added by performance factor (in shares) | shares	167