EMPLOYEE BENEFIT PLANS - Schedule of Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 304.1	$ 271.5
NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.9	3.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	51.5	57.4
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	243.1	200.5
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	9.9
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.4	13.2
Equity | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.4	13.2
Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.3	17.5
Debt Securities and other | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities and other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.5	4.5
Debt Securities and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.8	13.0
Debt Securities and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.5	1.3
Cash and cash equivalents | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.5	1.3
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	70.8	95.1
Equity | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.9	3.7
Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19.9	34.8
Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.0	56.5
Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	182.4	125.6
Debt Securities and other | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities and other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.1	0.0
Debt Securities and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179.2	125.6
Debt Securities and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.9	15.3
Insurance Contracts | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Insurance Contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Insurance Contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.3	5.4
Insurance Contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	9.9
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.8	3.5
Cash and cash equivalents | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.0	3.5
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.7	0.0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.0	$ 0.0