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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss | $ 257.5 | $ 265.9 | $ 245.8
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost, net of accumulated taxes of $2.0 and $3.4 in 2017 and 2016, respectively, for pension benefits and $(0.5) and $(1.2) in 2017 and 2016, respectively, for other benefits | 6.3 | 5.6 |
Net actuarial loss, net of accumulated taxes of $91.0 and $143.5 in 2017 and 2016, respectively, for pension benefits and $3.1 and $5.0 in 2017 and 2016, respectively, for other benefits | 243.2 | 254.1 |
Impact of Tax Cuts and Jobs Act of 2017 | 48.7 | 0.0 |
Accumulated other comprehensive loss | 298.2 | 259.7 |
Prior service cost, accumulated taxes | 2.0 | 3.4 |
Net actuarial loss, accumulated taxes | 91.0 | 143.5 |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost, net of accumulated taxes of $2.0 and $3.4 in 2017 and 2016, respectively, for pension benefits and $(0.5) and $(1.2) in 2017 and 2016, respectively, for other benefits | (1.8) | (2.1) |
Net actuarial loss, net of accumulated taxes of $91.0 and $143.5 in 2017 and 2016, respectively, for pension benefits and $3.1 and $5.0 in 2017 and 2016, respectively, for other benefits | 9.8 | 8.3 |
Impact of Tax Cuts and Jobs Act of 2017 | 1.3 | 0.0 |
Accumulated other comprehensive loss | 9.3 | 6.2 |
Prior service cost, accumulated taxes | (0.5) | (1.2) |
Net actuarial loss, accumulated taxes | $ 3.1 | $ 5.0 |

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