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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense (benefit) |  | $ 41.0 | $ 47.0 | $ 43.6 | $ 68.3 |
Income tax expense, percentage of pre-tax income |  | 13.90% | 17.40% | 7.40% | 14.50% |
Effective tax rate |  | 21.00% | 35.00% |  |  |
Provisional income tax expense |  |  |  |  |  | $ 317.8
Provisional estimate of minimum tax on foreign earnings |  | $ 6.4 |  | $ 15.5 |  |
Repatriated undistributed foreign earnings | $ 1,600.0 |  |  |  |  |
Repatriated cash, cash equivalents and investments | 1,400.0 |  |  |  |  |
Repatriated note | 200.0 |  |  |  |  |
Total gross unrecognized tax benefits | $ 74.6 | $ 74.6 |  | 74.6 |  | $ 65.4
Net decrease of unrecognized tax benefits |  |  |  | $ (9.2) |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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