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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 11.3
Prior service cost |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Total net periodic benefit cost, before tax | (0.3)
Recognized actuarial loss |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Total net periodic benefit cost, before tax | 15.3
Pension and other postretirement benefit plans |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Total net periodic benefit cost, before tax | 15.0
Total net periodic benefit cost, tax benefit | (3.7)
Amounts reclassified from accumulated other comprehensive income (loss) | $ 11.3

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