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, 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)