INCOME TAXES - Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INCOME TAXES
Effective tax rate, including discontinued operations (as a percent)	24.40%	24.10%	23.00%
Effective tax rate from discontinued operations (as a percent)	25.50%	26.60%	24.70%
State tax, low end of range of rate (as a percent)	6.00%
State tax, high end of range of rate (as a percent)	6.50%
Income taxes paid, excluding income tax refunds	$ 115.7	$ 148.7	$ 77.5
Income tax refunds	$ 36.4	$ 42.3	$ 19.4