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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | $ 1,910.7 | $ 1,667.4 | $ 1,028.9 | $ 961.2 | $ 1,667.4 | $ 961.2
Amortization of prior service cost | (0.9) |  | (1.2) |  | (1.8) | (2.3)
Amortization of net loss (gain) | 2.0 |  | 1.3 |  | 2.8 | 2.5
Other adjustments | (1.9) |  | 0.1 |  | (1.6) | (0.1)
Balance at the end of the period | 2,133.6 | 1,910.7 | 1,172.8 | 1,028.9 | 2,133.6 | 1,172.8
Pensions |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | (38.7) | (39.1) | (61.2) | (61.7) | (39.1) | (61.7)
Amortization of prior service cost | (0.2) | (0.2) | (0.4) | (0.4) |  |
Amortization of net loss (gain) | 0.7 | 0.6 | 1.0 | 0.9 |  |
Balance at the end of the period | (38.2) | (38.7) | (60.6) | (61.2) | (38.2) | (60.6)
Post Retirement |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | 9.6 | 10.1 | 11.7 | 12.2 | 10.1 | 12.2
Amortization of prior service cost | (0.7) | (0.7) | (0.7) | (0.7) |  |
Amortization of net loss (gain) | 0.2 | 0.2 | 0.3 | 0.2 |  |
Balance at the end of the period | 9.1 | 9.6 | 11.3 | 11.7 | 9.1 | 11.3
Non-Qualified Plans |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | (0.7) | (0.7) | (0.5) | (0.6) | (0.7) | (0.6)
Amortization of prior service cost |  |  | (0.1) |  |  |
Amortization of net loss (gain) |  |  |  | 0.1 |  |
Balance at the end of the period | (0.7) | (0.7) | (0.6) | (0.5) | (0.7) | (0.6)
Other |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | (0.9) | (1.2) | (0.9) | (0.7) | (1.2) | (0.7)
Amortization of net loss (gain) | 1.1 |  |  |  |  |
Foreign currency exchange | (2.3) | 0.3 | (0.1) | (0.2) |  |
Other adjustments | 0.4 |  | 0.2 |  |  |
Balance at the end of the period | (1.7) | (0.9) | (0.8) | (0.9) | (1.7) | (0.8)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |
Balance at the beginning of the period | (30.7) | (30.9) | (50.9) | (50.8) | (30.9) | (50.8)
Amortization of prior service cost | (0.9) | (0.9) | (1.2) | (1.1) |  |
Amortization of net loss (gain) | 2.0 | 0.8 | 1.3 | 1.2 |  |
Foreign currency exchange | (2.3) | 0.3 | (0.1) | (0.2) |  |
Other adjustments | 0.4 |  | 0.2 |  |  |
Balance at the end of the period | $ (31.5) | $ (30.7) | $ (50.7) | $ (50.9) | $ (31.5) | $ (50.7)

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