INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INCOME TAXES
Effective income tax rate (as a percent)	9.50%	20.40%	12.40%	16.40%
One-time transition tax due to issuance of technical guidance		$ 6.2		$ 1.1
Tax expense, issuance of technical guidance on calculation of foreign tax credits		10.2		10.2
Excess tax benefits, share-based compensation	$ 23.3	13.0	$ 45.6	31.5
Recognized discrete tax expense (benefit)	(22.5)	$ 1.2	(44.4)	$ 26.2
Tax expense, change if foreign and domestic estimates	0.6		4.5
Recognized discrete tax benefits, release of reserves for uncertain tax positions	$ (0.2)		$ 3.3