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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | $ 2,296.9 | $ 1,667.4 | $ 961.2
Other adjustments | 1.2 | 0.2 | (0.5)
Balance at the end of the period | 2,400.7 | 2,296.9 | 1,667.4
Comprehensive Income (Loss): |  |  |
Tax benefit (expense) on other comprehensive income (loss) | (1.2) | (9.3) | (8.1)
Pensions |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (25.8) | (39.1) |
Amortization of prior service cost |  | (0.8) |
Amortization of net gain (loss) | 5.5 | 14.1 |
Balance at the end of the period | (20.3) | (25.8) | (39.1)
Post Retirement |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | 18.7 | 10.1 |
Amortization of prior service cost | (2.8) | (2.7) |
Amortization of net gain (loss) | (4.9) | 11.3 |
Balance at the end of the period | 11.0 | 18.7 | 10.1
Non-Qualified Plans |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | 0.1 | (0.7) |
Amortization of net gain (loss) | (0.3) | 0.8 |
Balance at the end of the period | (0.2) | 0.1 | (0.7)
Other |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | 0.1 | (1.2) |
Amortization of net gain (loss) |  | 1.1 |
Foreign currency exchange | (0.5) | (0.4) |
Other adjustments | 1.7 | 0.6 |
Balance at the end of the period | 1.3 | 0.1 | (1.2)
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (6.9) | (30.9) | (50.8)
Amortization of prior service cost | (2.8) | (3.5) |
Amortization of net gain (loss) | 0.3 | 27.3 |
Foreign currency exchange | (0.5) | (0.4) |
Other adjustments | 1.7 | 0.6 |
Balance at the end of the period | $ (8.2) | $ (6.9) | $ (30.9)

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