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

Accumulated Other Comprehensive Income (Loss), Available-For-Sale Securities Adjustment, Net of Tax [Abstract]

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax [Abstract]

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Other Comprehensive Income (Loss), Before Reclassification Adjustments, Net of Tax

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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).

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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