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PENSION AND POST-RETIREMENT PLANS - FAIR VALUE (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pension and Post-retirement Plans |  |  |
Total | $ 162.2 | $ 186.7 | $ 178.8
Significant Unobservable Inputs (Level 3) | Private equity partnership interests |  |  |
Pension and Post-retirement Plans |  |  |
Total |  | 0.1 | $ 0.1
Fair Value Measurement |  |  |
Pension and Post-retirement Plans |  |  |
Total | 162.3 | 186.7 |
Fair Value Measurement | Cash |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.2 | 6.6 |
Fair Value Measurement | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 50.6 | 66.0 |
Fair Value Measurement | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 38.4 | 42.6 |
Fair Value Measurement | International large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 18.0 | 21.6 |
Fair Value Measurement | International small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 8.1 | 9.5 |
Fair Value Measurement | U.S. Treasuries |  |  |
Pension and Post-retirement Plans |  |  |
Total | 8.0 | 8.0 |
Fair Value Measurement | Municipal bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.1 | 0.1 |
Fair Value Measurement | Investment grade U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 20.8 | 17.5 |
Fair Value Measurement | High-yield U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.5 | 3.6 |
Fair Value Measurement | Real estate partnerships interests |  |  |
Pension and Post-retirement Plans |  |  |
Total | 11.6 | 11.1 |
Fair Value Measurement | Private equity partnership interests |  |  |
Pension and Post-retirement Plans |  |  |
Total |  | 0.1 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) |  |  |
Pension and Post-retirement Plans |  |  |
Total | 56.9 | 63.0 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Cash |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.2 | 6.6 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 24.9 | 28.1 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 25.8 | 28.3 |
Fair Value Measurement | Significant Observable Inputs (Level 2) |  |  |
Pension and Post-retirement Plans |  |  |
Total | 93.8 | 112.5 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 25.7 | 37.9 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 12.6 | 14.3 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | International large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 18.0 | 21.6 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | International small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 8.1 | 9.5 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. Treasuries |  |  |
Pension and Post-retirement Plans |  |  |
Total | 8.0 | 8.0 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | Municipal bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.1 | 0.1 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | Investment grade U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 20.8 | 17.5 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | High-yield U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.5 | 3.6 |
Fair Value Measurement | Significant Unobservable Inputs (Level 3) |  |  |
Pension and Post-retirement Plans |  |  |
Total | 11.6 | 11.2 |
Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Real estate partnerships interests |  |  |
Pension and Post-retirement Plans |  |  |
Total | $ 11.6 | 11.1 |
Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Private equity partnership interests |  |  |
Pension and Post-retirement Plans |  |  |
Total |  | $ 0.1 |

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