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EMPLOYEE BENEFIT PLANS - Schedule of Information Regarding Defined Benefit Pension Plans (Details) - Defined benefit pension plans - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Change in projected benefit obligation: |  |  |  |  |
Beginning of year | $ 114.9 | $ 128.7 |  |  |
Service cost | 6.0 | 7.9 | $ 6.8 |  |
Interest cost | 0.8 | 1.0 | 1.2 |  |
Participant contributions | 1.2 | 2.2 |  |  |
Actuarial loss (gain) | 0.7 | (7.4) |  |  |
Benefits paid | (0.3) | (3.1) |  |  |
Plan amendment | (2.0) | 0.0 |  |  |
Settlements and curtailment gain | (22.5) | (22.2) |  |  |
Special termination benefits | 0.0 | 0.6 |  |  |
Currency exchange rate changes and other | (1.4) | 7.2 |  |  |
End of year | 97.4 | 114.9 | 128.7 |  |
Change in fair value of plan assets: |  |  |  |  |
Beginning of year | 71.2 | 78.6 |  |  |
Actual return on plan assets | (0.8) | 4.3 |  |  |
Employer contributions | 3.9 | 6.5 |  |  |
Participant contributions | 1.2 | 2.2 |  |  |
Settlements | (14.4) | (20.7) |  |  |
Benefits paid | (0.3) | (3.1) |  |  |
Currency exchange rate changes and other | (0.4) | 3.4 |  |  |
End of year | 60.4 | 71.2 | 78.6 |  |
Funded Status |  |  |  |  |
Projected benefit obligation | (114.9) | (128.7) | (128.7) | $ (97.4) | $ (114.9)
Plan assets at fair value | $ 71.2 | $ 78.6 | $ 78.6 | 60.4 | 71.2
Underfunded status |  |  |  | (37.0) | (43.7)
Accumulated other comprehensive loss, net of tax: |  |  |  |  |
Net actuarial loss |  |  |  | (19.4) | (17.1)
Net prior service cost |  |  |  | 2.3 | (0.9)
Deferred income tax benefit |  |  |  | 3.6 | 3.9
Total |  |  |  | (13.5) | (14.1)
Other long-term liabilities |  |  |  |  |
Net amounts recognized on the consolidated balance sheet: |  |  |  |  |
Other long-term liabilities |  |  |  | $ 37.0 | $ 43.7

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