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EMPLOYEE BENEFIT PLANS - Schedule of Target Weighted-Average Asset Allocations and Fair Value (Details) - Defined benefit pension plans - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocations (as a percent) | 100.00% |  |
Plan assets at fair value | $ 60.4 | $ 71.2 | $ 78.6
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 46.4 | 50.9 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 6.3 | 7.7 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1.0 | 2.7 |
Total plan assets measured at fair value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 53.7 | 61.3 |
Alternative investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 6.7 | 9.9 |
Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 7.0 | 1.3 |
Cash | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 7.0 | 1.3 |
Cash | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Cash | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 0.0 | 0.0 |
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocations (as a percent) | 22.50% |  |
United States equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 0.5 | 4.5 |
United States equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.5 | 4.5 |
United States equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
United States equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
International equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 9.3 | 17.2 |
International equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 9.3 | 17.2 |
International equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
International equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 0.0 | 0.0 |
Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocations (as a percent) | 49.70% |  |
United States government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 6.4 | 3.3 |
United States government bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 6.4 | 3.3 |
United States government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
United States government bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
International government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 23.2 | 24.6 |
International government bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 23.2 | 24.6 |
International government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
International government bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 0.0 | 0.0 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocations (as a percent) | 6.80% |  |
Plan assets at fair value | $ 4.1 | 4.3 |
Real estate | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Real estate | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 4.1 | 4.3 |
Real estate | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Mortgages |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 2.2 | 3.4 |
Mortgages | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Mortgages | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 2.2 | 3.4 |
Mortgages | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 1.0 | 2.7 |
Insurance contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Insurance contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 0.0 | 0.0 |
Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 1.0 | $ 2.7 | $ 58.5
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocations (as a percent) | 21.00% |  |

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