STOCK-BASED COMPENSATION - Components of Stock Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 12.9	$ 16.5
Tax benefits on stock-based compensation expense	$ (0.4)	$ 1.6	3.5	4.7
To be settled with stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	3.1	5.1	7.7	10.3
Employee contributions for above stock plans	2.3	3.6	5.2	6.2
Total stock-based compensation	5.4	8.7	12.9	16.5
Tax benefits on stock-based compensation expense	0.7	1.2	1.8	2.4
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	(1.1)	0.4	1.7	2.3
To be settled with stock | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.3	0.9	0.0	1.5
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 (income)	0.4	0.5	0.9	1.1
To be settled with stock | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.2	0.3	0.4	0.5
To be settled with stock | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.2	0.3	0.5	0.6
To be settled with stock | 2018 and later PSU - TSR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.8	0.8	1.7	1.5
To be settled with stock | 2018 and later PSU - E B I T C A G R based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.2	1.1	(1.9)	2.7
To be settled with stock | 2017 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.0	0.4	0.0	0.9
To be settled with stock | Restricted Stock Unit (RSU) awards 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.7	0.5	5.4	1.0
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 (income)	0.3	0.3	0.7	0.5
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.5	0.3	(3.9)	3.6
To be settled in cash | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.1	0.2	0.2	0.3
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 (income)	0.0	0.0	0.0	0.0
To be settled in cash | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	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 (income)	0.0	0.0	0.0	0.0
To be settled in cash | 2018 and later PSU - TSR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.0	(0.1)	(1.8)	0.7
To be settled in cash | 2018 and later PSU - E B I T C A G R based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.4	0.8	(2.4)	2.8
To be settled in cash | 2017 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.0	(0.6)	0.1	(0.2)
To be settled in cash | Restricted Stock Unit (RSU) awards 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	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 (income)	$ 0.0	$ 0.0	$ 0.0	$ 0.0