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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts recognized in net periodic benefit cost during the period: |  |  |
Total recognized in other comprehensive income | $ (10.4) | $ (8.4) | $ 20.1
Pension Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $2.6 in 2018 and $0.0 in 2017, respectively, for pension benefits and $0.0 in 2018 and $0.1 in 2017, respectively, for other benefits | 6.6 | 2.5 |
Foreign currency exchange rate gain, net of taxes of ($0.1) in 2018 and $(1.2) in 2017, respectively, for pension benefits and $0.0 in 2018 and 2017, respectively, for other benefits | (0.2) | (0.4) |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(4.8) and $(3.7) in 2018 and 2017, respectively, for pension benefits and $(0.3) in 2018 and 2017, respectively, for other benefits | (14.9) | (11.8) |
Amortization of prior service cost, net of taxes of $(0.1) 2018 and 2017, for pension benefits and $0.2 in 2018 and 2017 for other benefits | (0.4) | (0.5) |
Total recognized in other comprehensive income | (8.9) | (10.2) |
Net actuarial loss (gain), taxes | 2.6 | 0.0 |
Foreign currency exchange rate (gain) loss, taxes | (0.1) | (1.2) |
Recognized actuarial loss, taxes | (4.8) | (3.7) |
Amortization of prior service cost, taxes | (0.1) | (0.1) |
Other Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $2.6 in 2018 and $0.0 in 2017, respectively, for pension benefits and $0.0 in 2018 and $0.1 in 2017, respectively, for other benefits | (1.5) | 0.9 |
Foreign currency exchange rate gain, net of taxes of ($0.1) in 2018 and $(1.2) in 2017, respectively, for pension benefits and $0.0 in 2018 and 2017, respectively, for other benefits | 0.3 | 1.1 |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(4.8) and $(3.7) in 2018 and 2017, respectively, for pension benefits and $(0.3) in 2018 and 2017, respectively, for other benefits | (1.1) | (1.0) |
Amortization of prior service cost, net of taxes of $(0.1) 2018 and 2017, for pension benefits and $0.2 in 2018 and 2017 for other benefits | 0.8 | 0.8 |
Total recognized in other comprehensive income | (1.5) | 1.8 |
Net actuarial loss (gain), taxes | 0.0 | 0.1 |
Foreign currency exchange rate (gain) loss, taxes | 0.0 | 0.0 |
Recognized actuarial loss, taxes | (0.3) | (0.3) |
Amortization of prior service cost, taxes | $ 0.2 | $ 0.2 |

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