Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications Out Of Accumulated Other Comprehensive Income (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications Out Of Accumulated Other Comprehensive Income (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Amortization of pension and other postretirement plan items:  
Total net periodic benefit cost, net of tax $ (12.1)
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 16.5
Accumulated Defined Benefit Plans Adjustment Attributable to Parent  
Amortization of pension and other postretirement plan items:  
Total net periodic benefit cost, before tax 16.0
Total net periodic benefit cost, tax benefit (3.9)
Total net periodic benefit cost, net of tax $ 12.1