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BENEFIT PLANS (Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized in net periodic benefit cost during the period: |  |  |
Total recognized in other comprehensive income | $ (8.4) | $ 20.1 | $ (17.5)
Pension Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $0.0 and $15.9 in 2017 and 2016, respectively, for pension benefits and $0.1 and $1.6 in 2017 and 2016, respectively, for other benefits | 2.5 | 26.0 |
Foreign currency exchange rate gain, net of taxes of $(1.2) in 2017 and $0.1 in 2016, respectively, for pension benefits and $0.0 in 2017 and 2016, respectively, for other benefits | (0.4) | 0.1 |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(3.7) and $(5.1) in 2017 and 2016, respectively, for pension benefits and $(0.3) in 2017 and 2016, respectively, for other benefits | (11.8) | (8.5) |
Amortization of prior service cost, net of taxes of $(0.1) and $(0.3) 2017 and 2016, for pension benefits and $0.2 in 2017 and $0.4 in 2016 for other benefits | (0.5) | (0.5) |
Total recognized in other comprehensive income | (10.2) | 17.1 |
Net actuarial loss (gain), taxes | 0.0 | 15.9 |
Foreign currency exchange rate (gain) loss, taxes | (1.2) | 0.1 |
Recognized actuarial loss, taxes | (3.7) | (5.1) |
Amortization of prior service cost, taxes | (0.3) | (0.3) |
Impact of Tax and Jobs Act of 2017 | (50.4) |  |
Other Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $0.0 and $15.9 in 2017 and 2016, respectively, for pension benefits and $0.1 and $1.6 in 2017 and 2016, respectively, for other benefits | 0.9 | 2.7 |
Foreign currency exchange rate gain, net of taxes of $(1.2) in 2017 and $0.1 in 2016, respectively, for pension benefits and $0.0 in 2017 and 2016, respectively, for other benefits | 1.1 | 0.1 |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(3.7) and $(5.1) in 2017 and 2016, respectively, for pension benefits and $(0.3) in 2017 and 2016, respectively, for other benefits | (1.0) | (0.5) |
Amortization of prior service cost, net of taxes of $(0.1) and $(0.3) 2017 and 2016, for pension benefits and $0.2 in 2017 and $0.4 in 2016 for other benefits | 0.8 | 0.7 |
Total recognized in other comprehensive income | 1.8 | 3.0 |
Net actuarial loss (gain), taxes | 0.1 | 1.6 |
Foreign currency exchange rate (gain) loss, taxes | 0.0 | 0.0 |
Recognized actuarial loss, taxes | (0.1) | (0.3) |
Amortization of prior service cost, taxes | 0.2 | $ 0.4 |
Impact of Tax and Jobs Act of 2017 | $ (1.3) |  |

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