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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | $ 961.2 | $ 805.7 | $ 755.3
Amortization of prior service cost | (4.6) | (4.7) | (4.5)
Amortization of net loss (gain) | 25.0 | (9.4) | 2.7
Other adjustments | (0.5) | 0.2 | (0.6)
Balance at the end of the period | 1,667.4 | 961.2 | 805.7
Comprehensive Income (Loss): |  |  |
Tax benefit (expense) on other comprehensive income (loss) | (8.1) | 4.2 | (0.3)
Pensions |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (61.7) | (51.9) |
Amortization of prior service cost | (1.7) | (1.8) |
Amortization of net loss (gain) | 24.3 | (8.0) |
Balance at the end of the period | (39.1) | (61.7) | (51.9)
Post Retirement |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | 12.2 | 16.3 |
Amortization of prior service cost | (2.8) | (2.8) |
Amortization of net loss (gain) | 0.7 | (1.3) |
Balance at the end of the period | 10.1 | 12.2 | 16.3
Non-Qualified Plans |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (0.6) | (0.4) |
Amortization of prior service cost | (0.1) | (0.1) |
Amortization of net loss (gain) |  | (0.1) |
Balance at the end of the period | (0.7) | (0.6) | (0.4)
Other |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (0.7) | (0.9) |
Foreign currency exchange | (0.9) | 0.5 |
Other adjustments | 0.4 | (0.3) |
Balance at the end of the period | (1.2) | (0.7) | (0.9)
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |
Balance at the beginning of the period | (50.8) | (36.9) | (34.5)
Amortization of prior service cost | (4.6) | (4.7) |
Amortization of net loss (gain) | 25.0 | (9.4) |
Foreign currency exchange | (0.9) | 0.5 |
Other adjustments | 0.4 | (0.3) |
Balance at the end of the period | $ (30.9) | $ (50.8) | $ (36.9)

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