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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
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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

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- Definition Accumulated Other Comprehensive Income (Loss) Defined Benefit Pension and Other Postretirement Plans Net Actuarial Gain (Loss) Net of Tax + References No definition available. + Details
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- Definition Tax to related to cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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