Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amount of Prior Service Cost and Actuarial Loss Included in Accumulated Other Comprehensive Loss that is Expected to Be Recognized in Net Periodic Benefit Cost (Details)

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BENEFIT PLANS - Amount of Prior Service Cost and Actuarial Loss Included in Accumulated Other Comprehensive Loss that is Expected to Be Recognized in Net Periodic Benefit Cost (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, net of taxes of $3.7 for pension benefits and $0.3 for other benefits $ 11.5
Prior service cost, net of taxes of $0.1 for pension benefits and $(0.2) for other benefits 0.4
Actuarial loss, taxes 3.7
Prior service cost, taxes 0.1
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, net of taxes of $3.7 for pension benefits and $0.3 for other benefits 1.0
Prior service cost, net of taxes of $0.1 for pension benefits and $(0.2) for other benefits (0.8)
Actuarial loss, taxes 0.3
Prior service cost, taxes $ (0.2)