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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income tax expense | $ 25.9 | $ 40.6 | $ 42.4 | $ 60.3 |
Effective income tax rate | 18.90% | 31.80% | 13.10% | 25.00% |
Change to Provisional One-Time US Tax Expense on Post 1986 Foreign Earnings |  |  | $ 3.1 |  |
One Time Provisional US Tax Expense on Post 1986 Foreign Earnings |  |  | 54.9 |  | $ 58.0
Existing Post 1986 Foreign Earnings Subject to One Time US Tax |  |  | 975.0 |  |
Write-Off of Deferred Tax Assets Relating to Officer Compensation |  |  | 1.7 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 10.0 |  | 10.0 |  |
German Deferred Tax Assets [Member] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ 23.5 |  |

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