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INCOME TAXES - Reconciliation Between Income Tax Expense and Computed Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income tax at Federal statutory rate | $ 13.9 | $ 13.2 | $ 15.9
State and local income taxes, net of federal tax benefit | 2.4 | 2.6 | 5.0
Impact of state rate changes | 0.1 | (0.1) | 0.3
Changes in valuation allowances | 0.0 | 0.0 | (21.7)
Reversal of valuation allowances | (0.3) | (0.2) | (29.4)
2017 TCJA, net deferred tax remeasurement and repatriation tax impacts | 0.0 | 0.0 | 10.4
Stock based compensation | (0.5) | (1.5) | 0.0
Non-deductible items | 0.8 | 0.1 | 0.1
Other items, net | (0.3) | (0.7) | (0.6)
Income tax | $ 16.1 | $ 13.4 | $ (20.0)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income tax at Federal statutory rate | 21.00% | 21.00% | 35.00%
State and local income taxes, net of federal tax benefit | 3.70% | 4.10% | 11.00%
Impact of state rate changes | 0.10% | (0.20%) | 0.70%
Changes in valuation allowances | 0.00% | 0.00% | (47.70%)
Reversal of valuation allowances | (0.40%) | (0.30%) | (64.60%)
2017 TCJA, net deferred tax remeasurement and repatriation tax impacts | 0.00% | 0.00% | 22.90%
Stock based compensation | (0.80%) | (2.40%) | 0.00%
Non-deductible items | 1.20% | 0.20% | 0.20%
Other items, net | (0.40%) | (1.10%) | (1.50%)
Income tax | 24.40% | 21.30% | (44.00%)

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