Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions			3 Months Ended	6 Months Ended
	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 segment
Number of reportable segments \| segment				1
ASU 2017-05
cumulative effect adjustment to retained earnings		$ 9.2
ASU 2016-01
Impairment of equity investments			$ 0.4
ASU 2017-08
cumulative effect adjustment to retained earnings	$ (0.3)