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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amounts recognized in net periodic benefit cost during the period: |  |  |
Total recognized in other comprehensive income | $ (19.0) | $ (10.4) | $ (8.4)
Pension Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $1.7 in 2019 and $2.6 in 2018, respectively, for pension benefits and $(1.8) in 2019 and $0.0 in 2018, respectively, for other benefits | 1.4 | 6.6 |
Foreign currency exchange rate gain, net of taxes of $0.1 in 2019 and $(0.1) in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively, for other benefits | 0.2 | (0.2) |
Prior service cost, net of taxes of $(0.7) in 2019 and $0.0 in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively for other benefits | 5.2 | 0.0 |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(3.7) and $(4.8) in 2019 and 2018, respectively, for pension benefits and $(0.3) in 2019 and 2018, respectively, for other benefits | (11.5) | (14.9) |
Amortization of prior service cost, net of taxes of $(0.1) in 2019 and 2018, for pension benefits and $0.2 in 2019 and $0.2 in 2018 for other benefits | (0.4) | (0.4) |
Curtailments, net of taxes of $(0.1) in 2019 for pension benefits | (0.2) | 0.0 |
Total recognized in other comprehensive income | (15.7) | (8.9) |
Net actuarial loss (gain), taxes | 1.7 | 2.6 |
Foreign currency exchange rate (gain) loss, taxes | 0.1 | (1.0) |
Recognized actuarial loss, taxes | (3.7) | (4.8) |
Prior service cost, tax | (0.7) | 0.0 |
Amortization of prior service cost, taxes | (0.1) | (0.1) |
Curtailments, tax | (0.1) |  |
Other Benefits |  |  |
Amounts arising during the period: |  |  |
Net actuarial loss (gain), net of taxes of $1.7 in 2019 and $2.6 in 2018, respectively, for pension benefits and $(1.8) in 2019 and $0.0 in 2018, respectively, for other benefits | (3.2) | (1.5) |
Foreign currency exchange rate gain, net of taxes of $0.1 in 2019 and $(0.1) in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively, for other benefits | 0.1 | 0.3 |
Prior service cost, net of taxes of $(0.7) in 2019 and $0.0 in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively for other benefits | 0.0 | 0.0 |
Amounts recognized in net periodic benefit cost during the period: |  |  |
Recognized actuarial loss, net of taxes of $(3.7) and $(4.8) in 2019 and 2018, respectively, for pension benefits and $(0.3) in 2019 and 2018, respectively, for other benefits | (1.0) | (1.1) |
Amortization of prior service cost, net of taxes of $(0.1) in 2019 and 2018, for pension benefits and $0.2 in 2019 and $0.2 in 2018 for other benefits | 0.8 | 0.8 |
Curtailments, net of taxes of $(0.1) in 2019 for pension benefits | 0.0 | 0.0 |
Total recognized in other comprehensive income | (3.3) | (1.5) |
Net actuarial loss (gain), taxes | (1.8) | 0.0 |
Foreign currency exchange rate (gain) loss, taxes | 0.0 | 0.0 |
Recognized actuarial loss, taxes | (0.3) | (0.3) |
Prior service cost, tax | 0.0 | 0.0 |
Amortization of prior service cost, taxes | $ 0.2 | $ 0.2 |

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