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INCOME TAXES - Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Uncertain gross tax positions, beginning balance	$ 225.6	$ 245.5	$ 216.1
Current year tax positions	37.8	77.7	29.0
Increase in prior year tax positions	13.9	63.7	2.7
Decrease in prior year tax positions	(78.8)	(65.0)	(0.9)
Settlements	(46.5)	(95.3)	(0.3)
Lapse of statutes of limitations	(1.3)	(1.0)	(1.1)
Uncertain gross tax positions, ending balance	$ 150.7	$ 225.6	$ 245.5

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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 of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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