STOCK-BASED COMPENSATION - Components of Stock Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 16.5	$ 20.7
Tax benefits on stock-based compensation expense	$ 1.0	$ 1.1	3.3	4.3
To be settled with stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	4.3	4.8	12.5	15.2
Employee contributions for above stock plans	2.5	3.0	4.0	5.5
Total stock-based compensation	6.8	7.8	16.5	20.7
Tax benefits on stock-based compensation expense	1.0	1.1	3.0	3.7
To be settled with stock | Tax benefits on stock-based compensation payments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits on stock-based compensation expense	0.0	0.0	0.3	0.6
To be settled with stock | Executive Stock Unit (ESU) program contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	1.1	1.0	1.8	2.2
To be settled with stock | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.5	0.4	0.8	0.8
To be settled with stock | ESU program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.4	0.3	0.6	0.7
To be settled with stock | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.2	0.2	0.4	0.4
To be settled with stock | 2023 PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.2	0.0	0.6	0.0
To be settled with stock | 2022 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.6	1.5	1.3	2.5
To be settled with stock | Restricted Stock Unit (RSU) awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.8	0.9	6.1	7.6
To be settled with stock | Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.5	0.5	0.9	1.0
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.3	1.2	1.1	1.2
To be settled in cash | Executive Stock Unit (ESU) program contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.2	0.2	0.3	0.4
To be settled in cash | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | ESU program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | 2023 PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.2	0.0	0.6	0.0
To be settled in cash | 2022 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	(0.1)	1.0	0.2	0.8
To be settled in cash | Restricted Stock Unit (RSU) awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense	$ 0.0	$ 0.0	$ 0.0	$ 0.0