STOCK-BASED COMPENSATION - Components of Stock Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 20.6	$ 23.9
Tax benefits on stock-based compensation expense	$ 1.7	$ 2.2	5.2	6.9
To be settled with stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	5.0	4.2	12.7	14.5
Employee contributions for above stock plans	2.7	3.2	7.9	9.4
Total stock-based compensation	7.7	7.4	20.6	23.9
Tax benefits on stock-based compensation expense	1.2	1.0	3.0	3.4
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	0.5	1.2	2.2	3.5
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)	1.9	1.1	1.9	2.6
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)	0.7	0.5	1.6	1.6
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)	0.5	0.4	0.9	0.9
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	0.2	0.7	0.8
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)	0.7	0.7	2.4	2.2
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)	0.1	0.0	(1.8)	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	1.3
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 (income)	0.7	0.5	6.1	1.5
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)	0.2	0.4	0.9	0.9
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	2.1	1.7	(1.8)	5.3
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)	0.3	0.2	0.5	0.5
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)	1.3	0.8	(0.5)	1.5
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)	0.5	0.3	(1.9)	3.1
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	0.4	0.1	0.2
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 (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