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BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	$ 185.1	$ 173.1	$ 185.7
Mutual funds | Equity
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of investments	50.00%
Mutual funds | Fixed Income Investments
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of investments	50.00%
Common trusts | Equity
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of investments	65.00%
Common trusts | Fixed Income Investments
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Percentage of investments	35.00%
Cash and cash equivalents
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	$ 12.9	12.4
Equity Securities | International
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	55.1	47.2
Fixed Income Securities | Fixed rate bonds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	55.1	49.2
Other Investments | Mutual funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	18.3	17.4
Other Investments | Common trusts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	4.3	11.8
Other Investments | Insurance contracts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	30.1	27.7
Other Investments | Hedge funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	8.9	7.1
Other Investments | Real estate
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.4	0.3
Level 1
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	141.4	126.2
Level 1 | Cash and cash equivalents
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	12.9	12.4
Level 1 | Equity Securities | International
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	55.1	47.2
Level 1 | Fixed Income Securities | Fixed rate bonds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	55.1	49.2
Level 1 | Other Investments | Mutual funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	18.3	17.4
Level 1 | Other Investments | Common trusts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 1 | Other Investments | Insurance contracts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 1 | Other Investments | Hedge funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 1 | Other Investments | Real estate
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	4.3	11.8
Level 2 | Cash and cash equivalents
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Equity Securities | International
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Fixed Income Securities | Fixed rate bonds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Other Investments | Mutual funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Other Investments | Common trusts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	4.3	11.8
Level 2 | Other Investments | Insurance contracts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Other Investments | Hedge funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 2 | Other Investments | Real estate
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	39.4	35.1	$ 36.4
Level 3 | Cash and cash equivalents
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3 | Equity Securities | International
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3 | Fixed Income Securities | Fixed rate bonds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3 | Other Investments | Mutual funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3 | Other Investments | Common trusts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	0.0	0.0
Level 3 | Other Investments | Insurance contracts
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	30.1	27.7
Level 3 | Other Investments | Hedge funds
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	8.9	7.1
Level 3 | Other Investments | Real estate
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Plan assets	$ 0.4	$ 0.3

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