INCOME TAXES (Reconciliation of Income Tax Provision) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
INCOME TAXES
Expected provision at the statutory rate	$ 12.4		$ 9.6	$ 30.0	$ 24.4
State income tax expense, net of federal benefit	1.3		0.6	2.8	2.1
Stock-based compensation	1.6		(13.1)	4.1	(12.7)
Transaction costs not deductible for tax purposes	0.4		1.5	0.6	1.8
Change in statutory tax rate, non-US				0.8	(1.7)
Foreign tax rate differential	(1.0)		(1.8)	(2.7)	(2.1)
Change in valuation allowance	(0.2)		(2.0)	(31.6)	(8.7)
US Tax Reform	4.6	$ 44.1		48.7
Other, net	1.8		5.8	(3.5)	4.3
Provision for income taxes	$ 20.9		$ 0.6	$ 49.2	$ 7.4