SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	$ 741.2	$ 812.3	$ 2,507.0	$ 2,711.4
Selling, general and administrative expenses	1,070.5	1,251.6	3,476.8	3,761.9
Operating income	85.5	20.7	(739.8)	225.4
Other expense, net	17.5	3.8	25.0	12.5
Net (loss) income	$ (4.0)	(60.1)	$ (970.1)	42.4
As Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		812.4		2,711.7
Selling, general and administrative expenses		1,252.3		3,764.0
Operating income		19.9		223.0
Other expense, net		3.0		10.1
Net (loss) income		(60.1)		42.4
As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		812.3		2,711.4
Selling, general and administrative expenses		1,251.6		3,761.9
Operating income		20.7		225.4
Other expense, net		3.8		12.5
Net (loss) income		(60.1)		42.4
Effect of Adoption of ASU No. 2017-07 | As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		(0.1)		(0.3)
Selling, general and administrative expenses		(0.7)		(2.1)
Operating income		0.8		2.4
Other expense, net		0.8		2.4
Net (loss) income		$ 0.0		$ 0.0