Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost (Details)

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BENEFIT PLANS - Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prior service cost, net of accumulated taxes of $1.9 and $2.0 in 2018 and 2017, respectively, for pension benefits and $(0.3) and $(0.5) in 2018 and 2017, respectively, for other benefits $ 5.9 $ 6.3
Net actuarial loss, net of accumulated taxes of $88.7 and $91.0 in 2018 and 2017, respectively, for pension benefits and $2.8 and $3.1 in 2018 and 2017, respectively, for other benefits 283.4 243.2
Impact of Tax Cuts and Jobs Act of 2017 0.0 48.7
Accumulated other comprehensive loss 289.3 298.2
Prior service cost, accumulated taxes 1.9 2.0
Net actuarial loss, accumulated taxes 88.7 91.0
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prior service cost, net of accumulated taxes of $1.9 and $2.0 in 2018 and 2017, respectively, for pension benefits and $(0.3) and $(0.5) in 2018 and 2017, respectively, for other benefits (0.9) (1.8)
Net actuarial loss, net of accumulated taxes of $88.7 and $91.0 in 2018 and 2017, respectively, for pension benefits and $2.8 and $3.1 in 2018 and 2017, respectively, for other benefits 8.7 9.8
Impact of Tax Cuts and Jobs Act of 2017 0.0 1.3
Accumulated other comprehensive loss 7.8 9.3
Prior service cost, accumulated taxes (0.3) (0.5)
Net actuarial loss, accumulated taxes $ 2.8 $ 3.1