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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications Out Of Accumulated Other Comprehensive Income (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Amortization of pension and other postretirement plan items: |
Total net periodic benefit cost, net of tax | $ (15.6)
Prior service cost |
Amortization of pension and other postretirement plan items: |
Total net periodic benefit cost, before tax | 0.5
Recognized actuarial loss |
Amortization of pension and other postretirement plan items: |
Total net periodic benefit cost, before tax | (21.1)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |
Amortization of pension and other postretirement plan items: |
Total net periodic benefit cost, before tax | (20.6)
Total net periodic benefit cost, tax benefit | 5.0
Total net periodic benefit cost, net of tax | $ (15.6)

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