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PENSION AND POST-RETIREMENT PLANS - FAIR VALUE (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension and Post-retirement Plans |  |  |
Total | $ 194.8 | $ 162.2 | $ 186.7
Fair Value Measurement |  |  |
Pension and Post-retirement Plans |  |  |
Total | 157.3 | 130.1 |
Total plan assets | 194.8 | 162.3 |
Fair Value Measurement | Cash |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.3 | 6.2 |
Fair Value Measurement | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 62.4 | 50.6 |
Fair Value Measurement | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 49.6 | 38.4 |
Fair Value Measurement | International large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.6 | 5.5 |
Fair Value Measurement | U.S. Treasuries |  |  |
Pension and Post-retirement Plans |  |  |
Total | 14.1 | 8.0 |
Fair Value Measurement | Municipal bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total |  | 0.1 |
Fair Value Measurement | Investment grade U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 18.2 | 20.8 |
Fair Value Measurement | High-yield U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.1 | 0.5 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) |  |  |
Pension and Post-retirement Plans |  |  |
Total | 63.9 | 56.9 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Cash |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.3 | 6.2 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 23.7 | 24.9 |
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 33.9 | 25.8 |
Fair Value Measurement | Significant Observable Inputs (Level 2) |  |  |
Pension and Post-retirement Plans |  |  |
Total | 93.4 | 73.2 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 38.7 | 25.7 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. mid- and small-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 15.7 | 12.6 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | International large-cap |  |  |
Pension and Post-retirement Plans |  |  |
Total | 6.6 | 5.5 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | U.S. Treasuries |  |  |
Pension and Post-retirement Plans |  |  |
Total | 14.1 | 8.0 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | Municipal bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total |  | 0.1 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | Investment grade U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 18.2 | 20.8 |
Fair Value Measurement | Significant Observable Inputs (Level 2) | High-yield U.S. corporate bonds |  |  |
Pension and Post-retirement Plans |  |  |
Total | 0.1 | 0.5 |
Fair Value Measurement | Investment measured at NAV |  |  |
Pension and Post-retirement Plans |  |  |
Total | $ 37.5 | $ 32.2 |

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