INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
INCOME TAXES
Effective income tax rate (as a percent)	11.40%	21.80%
One-time transition tax due to issuance of technical guidance	$ 5.1	$ 11.3
Excess tax benefits, share-based compensation	18.7	6.8
Recognized discrete tax expense (benefit)	$ (27.7)	(0.1)
Recognized discrete tax benefits, release of reserves for uncertain tax positions		$ 4.6