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SIGNIFICANT ACCOUNTING POLICIES - COMPREHENSIVE INCOME (LOSS) AND SUBSEQUENT EVENT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | $ 450.6 | $ 363.8 | $ 338.2
Net gain (loss) in prior service cost | 0.7 | 5.1 | (31.4)
Amortization of prior service cost | (1.3) | (1.3) | (1.3)
Amortization of net loss (gain) | 1.2 | 1.8 | 2.5
Foreign currency translation and other adjustments | 0.1 | 0.7 | 0.4
Other | 0.1 | 0.1 |
Balance at the end of the period | 471.5 | 450.6 | 363.8
Comprehensive Income (Loss): |  |  |
Tax benefit (expense) on other comprehensive income (loss) | 0.7 | (5.0) | 19.4
Pension Benefits |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (41.7) | (45.0) |
Net gain (loss) in prior service cost |  | 3.7 |
Amortization of prior service cost | (1.4) | (1.3) |
Amortization of net loss (gain) | 1.7 | 0.9 |
Balance at the end of the period | (41.4) | (41.7) | (45.0)
Post Retirement |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (4.7) | (7.2) |
Net gain (loss) in prior service cost | 0.7 | 1.4 |
Amortization of prior service cost |  | 0.1 |
Amortization of net loss (gain) | (0.4) | 1.0 |
Balance at the end of the period | (4.4) | (4.7) | (7.2)
Non-Qualified Plans |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (0.2) | (0.5) |
Net gain (loss) in prior service cost | (0.1) | 0.5 |
Amortization of prior service cost | (0.1) | (0.1) |
Amortization of net loss (gain) |  | (0.1) |
Balance at the end of the period | (0.4) | (0.2) | (0.5)
Foreign Currency Transaction |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | 1.0 | 0.3 |
Foreign currency translation and other adjustments | 0.1 | 0.7 |
Balance at the end of the period | 1.1 | 1.0 | 0.3
Interest Hedge |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (0.6) | (0.7) |
Other | 0.1 | 0.1 |
Balance at the end of the period | (0.5) | (0.6) | (0.7)
Other |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (0.7) | (0.2) |
Net gain (loss) in prior service cost | 0.1 | (0.5) |
Amortization of prior service cost | 0.2 |  |
Amortization of net loss (gain) | (0.1) |  |
Balance at the end of the period | (0.5) | (0.7) | (0.2)
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (46.9) | (53.3) | (23.5)
Net gain (loss) in prior service cost | 0.7 | 5.1 |
Amortization of prior service cost | (1.3) | (1.3) |
Amortization of net loss (gain) | 1.2 | 1.8 |
Foreign currency translation and other adjustments | 0.1 | 0.7 |
Other | 0.1 | 0.1 |
Balance at the end of the period | $ (46.1) | $ (46.9) | $ (53.3)

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