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PENSION AND POST-RETIREMENT PLANS - AMOUNTS INCLUDED IN FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee benefit plans |  |  |
Current liabilities | $ (3.1) | $ (3.0) |
Non-current liabilities, net | (73.4) | (79.4) |
Pension Benefits |  |  |
Employee benefit plans |  |  |
Benefit obligation | 239.9 | 217.4 | $ 232.1
Fair value of plan assets at end of year | 194.8 | 162.2 | 186.7
Pension Benefits | Qualified Plan |  |  |
Employee benefit plans |  |  |
Non-current assets | 1.0 | 0.8 |
Non-current liabilities, net | (46.1) | (56.0) |
Total | (45.1) | (55.2) |
Net loss, net of taxes | (56.2) | (61.8) |
Prior service credit, net of taxes | 4.3 | 6.0 |
Total | (51.9) | (55.8) |
Benefit obligation | 238.3 | 215.9 |
Accumulated benefit obligation | 237.9 | 215.6 |
Fair value of plan assets at end of year | 192.2 | 159.9 |
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2020 | 1.5 |  |
Pension Benefits | Nonqualified Plan |  |  |
Employee benefit plans |  |  |
Current liabilities | (2.1) | (1.8) |
Non-current liabilities, net | (2.3) | (2.4) |
Total | (4.4) | (4.2) |
Net loss, net of taxes | (0.6) | (0.4) |
Prior service credit, net of taxes | 0.2 | 0.3 |
Total | (0.4) | (0.1) |
Post-retirement Benefits |  |  |
Employee benefit plans |  |  |
Benefit obligation | 26.0 | 22.2 | $ 27.7
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2020 | $ 2.3 |  |
Amortization period of unrecognized gains and losses | 5 years |  |
Post-retirement Benefits | Qualified Plan |  |  |
Employee benefit plans |  |  |
Current liabilities | $ (1.0) | (1.2) |
Non-current liabilities, net | (25.0) | (21.0) |
Total | (26.0) | (22.2) |
Net loss, net of taxes | (2.8) | (0.1) |
Prior service credit, net of taxes | 19.1 | 21.8 |
Total | $ 16.3 | $ 21.7 |

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