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PENSION AND POST-RETIREMENT PLANS - AMOUNTS INCLUDED IN FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee benefit plans |  |  |
Non-current liabilities, net | $ (43.3) | $ (82.0) |
Pension Benefits |  |  |
Employee benefit plans |  |  |
Projected benefit obligations | 249.5 | 263.1 | $ 239.9
Fair value of plan assets at end of year | 238.9 | 212.8 | 194.8
Pension Benefits | Qualified Plan |  |  |
Employee benefit plans |  |  |
Non-current assets | 1.3 | 1.0 |
Non-current liabilities, net | (11.9) | (51.3) |
Total | (10.6) | (50.3) |
Net loss, net of taxes | (39.9) | (64.2) |
Prior service credit, net of taxes | 0.8 | 2.5 |
Total | (39.1) | (61.7) |
Projected benefit obligations | 247.8 | 261.4 |
Accumulated benefit obligation | 247.4 | 260.9 |
Fair value of plan assets at end of year | 235.8 | 210.0 |
Pension Benefits | Nonqualified Plan |  |  |
Employee benefit plans |  |  |
Current liabilities | (1.8) | (1.7) |
Non-current liabilities, net | (3.0) | (2.6) |
Total | (4.8) | (4.3) |
Net loss, net of taxes | (0.7) | (0.8) |
Prior service credit, net of taxes |  | 0.1 |
Total | (0.7) | (0.7) |
Post-retirement benefits |  |  |
Employee benefit plans |  |  |
Projected benefit obligations | $ 29.3 | 29.1 | $ 26.0
Amortization period of unrecognized gains and losses | 5 years |  |
Post-retirement benefits | Qualified Plan |  |  |
Employee benefit plans |  |  |
Current liabilities | $ (0.9) | (1.0) |
Non-current liabilities, net | (28.4) | (28.1) |
Total | (29.3) | (29.1) |
Net loss, net of taxes | (3.7) | (4.4) |
Prior service credit, net of taxes | 13.9 | 16.6 |
Total | $ 10.2 | $ 12.2 |

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