STOCK-BASED COMPENSATION - Components of Stock Based Compensation (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 stock-based_retirement_plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 23.9	$ 26.6
Tax benefits on stock-based compensation expense	$ 2.2	$ 3.4	6.9	7.3
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	4.2	3.7	14.5	16.4
Employee contributions for above stock plans	3.2	3.7	9.4	10.2
Total stock-based compensation	7.4	7.4	23.9	26.6
Tax benefits on stock-based compensation expense	1.0	0.9	3.4	3.9
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	1.2	2.5	3.5	3.4
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	1.1	(0.4)	2.6	3.7
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	0.5	1.6	1.4
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	0.4	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-based compensation expense	0.2	0.2	0.8	0.8
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	0.9	1.3	2.8
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	0.7	0.3	2.2	0.9
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	0.0	0.8	2.7	2.3
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	0.6	1.5	1.6
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	0.2	0.0	1.4
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	0.4	0.2	0.9	0.6
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.7	0.8	5.3	4.7
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	0.4	0.5	0.9
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	0.4	(0.9)	0.2	(0.9)
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	0.8	0.2	1.5	0.8
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	0.3	0.9	3.1	2.5
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	0.2	0.0	1.4
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