SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	$ 809.1	$ 874.2
Selling, general and administrative expenses	1,122.3	1,191.1
Operating income	(20.7)	29.5
Other expense, net	2.7	4.5
Net loss	(10.1)	$ (16.1)
As Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	874.3
Selling, general and administrative expenses	1,191.8
Operating income	28.7
Other expense, net	3.7
Net loss	(16.1)
As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	874.2
Selling, general and administrative expenses	1,191.1
Operating income	29.5
Other expense, net	4.5
Net loss	(16.1)
Effect of Adoption of ASU No. 2017-07 | As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	(0.1)
Selling, general and administrative expenses	(0.7)
Operating income	0.8
Other expense, net	0.8
Net loss	$ 0.0