STOCK-BASED COMPENSATION - Components of Stock Based Compensation (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 stock-based_retirement_plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 16.5	$ 19.2
Tax benefits on stock-based compensation expense	$ 1.6	$ 1.9	4.7	3.9
Number of stock-based retirement plans | stock-based_retirement_plan					2
To be settled with stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	5.1	6.7	10.3	12.7
Employee contributions for above stock plans	3.6	3.8	6.2	6.5
Total stock-based compensation	8.7	10.5	16.5	19.2
Tax benefits on stock-based compensation expense	1.2	1.6	2.4	3.0
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	0.4	0.3	2.3	0.9
To be settled with stock | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.9	2.2	1.5	4.1
To be settled with stock | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.5	0.4	1.1	0.9
To be settled with stock | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.3	0.3	0.5	0.5
To be settled with stock | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.3	0.3	0.6	0.6
To be settled with stock | Performance Stock Unit (PSU) awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.4	1.0	0.9	1.9
To be settled with stock | Performance Stock Unit (PSU) awards | 2018 PSU - TSR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.8	0.3	1.5	0.6
To be settled with stock | Performance Stock Unit (PSU) awards | 2018 PSU - EBIT CAGR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.1	0.9	2.7	1.5
To be settled with stock | Restricted Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.5	0.5	1.0	1.0
To be settled with stock | Profitable Growth Incentive awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.7	0.0	1.2
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-based compensation expense	0.3	0.1	0.5	0.4
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.3	2.3	3.6	3.9
To be settled in cash | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.2	0.3	0.3	0.5
To be settled in cash | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	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-based 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-based compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | Performance Stock Unit (PSU) awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	(0.6)	0.1	(0.2)	0.0
To be settled in cash | Performance Stock Unit (PSU) awards | 2018 PSU - TSR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	(0.1)	0.3	0.7	0.6
To be settled in cash | Performance Stock Unit (PSU) awards | 2018 PSU - EBIT CAGR based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.8	0.9	2.8	1.6
To be settled in cash | Restricted Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0	0.0
To be settled in cash | Profitable Growth Incentive awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.7	0.0	1.2
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-based compensation expense	$ 0.0	$ 0.0	$ 0.0	$ 0.0