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, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, net of taxes of $4.7 for pension benefits and $0.3 for other benefits $ 14.9
Prior service cost, net of taxes of $0.1 for pension benefits and $(0.2) for other benefits 0.4
Actuarial loss, taxes 4.7
Prior service cost, taxes 0.1
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss, net of taxes of $4.7 for pension benefits and $0.3 for other benefits 1.1
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)