SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales	$ 956.7	$ 1,024.9	$ 1,765.8	$ 1,899.1
Selling, general and administrative expenses	1,284.0	1,319.2	2,406.3	2,510.3
Operating income	(804.6)	175.2	(825.3)	204.7
Other expense, net	4.8	4.2	7.5	8.7
Net (loss) income	$ (956.0)	118.6	$ (966.1)	102.5
As Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		1,025.0		1,899.3
Selling, general and administrative expenses		1,319.9		2,511.7
Operating income		174.4		203.1
Other expense, net		3.4		7.1
Net (loss) income		118.6		102.5
As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		1,024.9		1,899.1
Selling, general and administrative expenses		1,319.2		2,510.3
Operating income		175.2		204.7
Other expense, net		4.2		8.7
Net (loss) income		118.6		102.5
Effect of Adoption of ASU No. 2017-07 | As Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of sales		(0.1)		(0.2)
Selling, general and administrative expenses		(0.7)		(1.4)
Operating income		0.8		1.6
Other expense, net		0.8		1.6
Net (loss) income		$ 0.0		$ 0.0