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DEFINED BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Net periodic benefit costs | $ 0.6 | $ 1.1 |
Service cost component | 0.7 | 1.4 |
Expected future employer contributions, next fiscal year |  |  | $ 1.8
Employer contributions |  | 1.0 |
Expected additional employer contributions | 1.0 | 1.0 |
Expected employer contributions, this fiscal year | 2.0 | 2.0 |
Estimated fair value of plan assets | $ 29.2 | $ 29.2 | $ 26.9

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