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, 2019
Dec. 31, 2018
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prior service cost, net of accumulated taxes of $0.1 and $1.9 in 2019 and 2018, respectively, for pension benefits and $0.0 million and $(0.3) in 2019 and 2018, respectively, for other benefits $ 0.5 $ 5.9
Net actuarial loss, net of accumulated taxes of $87.7 and $88.7 in 2019 and 2018, respectively, for pension benefits and $0.6 and $2.8 in 2019 and 2018, respectively, for other benefits 273.1 283.4
Accumulated other comprehensive loss 273.6 289.3
Prior service cost, accumulated taxes 0.1 1.9
Net actuarial loss, accumulated taxes 87.7 88.7
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Prior service cost, net of accumulated taxes of $0.1 and $1.9 in 2019 and 2018, respectively, for pension benefits and $0.0 million and $(0.3) in 2019 and 2018, respectively, for other benefits (0.2) (0.9)
Net actuarial loss, net of accumulated taxes of $87.7 and $88.7 in 2019 and 2018, respectively, for pension benefits and $0.6 and $2.8 in 2019 and 2018, respectively, for other benefits 4.7 8.7
Accumulated other comprehensive loss 4.5 7.8
Prior service cost, accumulated taxes 0.0 (0.3)
Net actuarial loss, accumulated taxes $ 0.6 $ 2.8