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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Gains (Losses) on Hedge Instruments |  |  |  |
Beginning balance | $ 1.8 | $ 1.6 | $ 0.7 | $ 0.2
Other comprehensive income (loss) before reclassifications | 0.0 | (0.2) | 2.8 | 3.3
Amounts reclassified from accumulated other comprehensive income (loss) | (1.4) | (0.9) | (3.1) | (3.0)
Net current-period other comprehensive income (loss) | (1.4) | (1.1) | (0.3) | 0.3
Ending balance | 0.4 | 0.5 | 0.4 | 0.5
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |
Beginning balance | 36.2 | 1.8 | 20.4 | (9.8)
Other comprehensive income (loss) before reclassifications | 11.6 | 18.0 | 28.4 | 29.6
Amounts reclassified from accumulated other comprehensive income (loss) | (3.7) | (0.1) | (4.7) | (0.1)
Net current-period other comprehensive income (loss) | 7.9 | 17.9 | 23.7 | 29.5
Ending balance | 44.1 | 19.7 | 44.1 | 19.7
Foreign Currency Translation Gains (Losses) |  |  |  |
Beginning balance | (20.6) | (0.7) | 0.0 | (0.3)
Other comprehensive income (loss) before reclassifications | 6.8 | (0.1) | (13.8) | (0.5)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | 0.0
Net current-period other comprehensive income (loss) | 6.8 | (0.1) | (13.8) | (0.5)
Ending balance | (13.8) | (0.8) | (13.8) | (0.8)
Employee Benefit Plans |  |  |  |
Beginning balance | (8.5) | (3.4) | (8.7) | (3.4)
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0 | 0.0 | (0.1)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.1 | 0.1 | 0.3 | 0.2
Net current-period other comprehensive income (loss) | 0.1 | 0.1 | 0.3 | 0.1
Ending balance | (8.4) | (3.3) | (8.4) | (3.3)
Total |  |  |  |
Beginning balance | 8.9 | (0.7) | 12.4 | (13.3)
Other comprehensive income (loss) before reclassifications | 18.4 | 17.7 | 17.4 | 32.3
Amounts reclassified from accumulated other comprehensive income (loss) | (5.0) | (0.9) | (7.5) | (2.9)
Net current-period other comprehensive income (loss) | 13.4 | 16.8 | 9.9 | 29.4
Ending balance | $ 22.3 | $ 16.1 | $ 22.3 | $ 16.1

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- Definition Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax [Abstract] + References No definition available. + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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