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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income tax expense | $ 8.9 | $ 10.6 | $ 16.5 | $ 19.7 |
Effective income tax rate | 11.30% | 18.10% | 8.80% | 17.40% |
Change to Provisional One-Time US Tax Expense on Post 1986 Foreign Earnings |  |  | $ 4.5 |  |
One Time Provisional US Tax Expense on Post 1986 Foreign Earnings |  |  | 53.5 |  | $ 58.0
Existing Post 1986 Foreign Earnings Subject to One Time US Tax |  |  | 1,100.0 |  |
Write-Off of Deferred Tax Assets Relating to Officer Compensation |  |  | 2.8 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 16.0 |  | 16.0 |  |
German Deferred Tax Assets [Member] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ 21.6 |  |

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