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EMPLOYEE BENEFIT PLANS - Schedule of Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 340.7	$ 304.1
NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	4.9
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60.7	51.5
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	264.0	243.1
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.0	4.6
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18.6	16.4
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	18.6	16.4
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	15.8	16.3
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	6.2	3.5
Debt Securities and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.6	12.8
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	1.5
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	1.5	1.5
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	75.0	70.8
Equity | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	4.9
Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22.1	19.9
Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.9	46.0
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	198.1	182.4
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	3.2	3.1
Debt Securities and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	194.9	179.2
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	14.8	8.9
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	4.8	4.3
Insurance Contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.0	4.6
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.8	7.8
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	9.0	7.0
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.8	0.7
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.0	$ 0.0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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