EQUITY AND CONVERTIBLE PREFERRED STOCK - Narrative (Details)				3 Months Ended				9 Months Ended
	Jul. 31, 2020 USD ($) shares	May 26, 2020 USD ($) shares	May 11, 2020 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) vote class $ / shares shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) shares	Mar. 31, 2021 USD ($) vote class $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Apr. 29, 2020 shares	Feb. 03, 2016 USD ($)
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01	$ 0.01
Common stock, shares authorized (in shares)				1,250,000,000.0				1,250,000,000.0	1,250,000,000.0
Common stock, shares outstanding (in shares)				766,100,000				766,100,000	765,100,000
Preferred stock, shares authorized (in shares)				20,000,000.0				20,000,000.0	20,000,000.0
Number of classes of preferred stock | class				2				2
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)				1,500,000				1,500,000	1,500,000
Preferred stock, shares outstanding (in shares)				1,500,000				1,500,000	1,500,000
Preferred stock classified as equity | $				$ 0				$ 0	$ 0
Payments of dividends | $								$ 1,500,000
Number of shares repurchased (in shares)				0			500,000	0
Treasury stock, value, acquired, cost method | $							$ 4,500,000
Changes in dividends accrued | $				$ 500,000	$ 400,000	$ 800,000		$ 1,700,000
Dividends, common stock, no longer expected to vest, forfeitures | $				1,700,000				1,700,000
Restricted Stock Units
Class of Stock [Line Items]
Payment for previously accrued dividends | $								1,500,000
Restricted Stock Units and Phantom Units | Other Noncurrent Liabilities
Class of Stock [Line Items]
Dividends payable | $				1,800,000				1,800,000
Restricted Stock Units and Phantom Units | Accrued Expenses and Other Current Liabilities
Class of Stock [Line Items]
Dividends payable | $				$ 1,700,000				$ 1,700,000
Common Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01
Votes per share | vote				1				1
Common stock, shares authorized (in shares)				1,250,000,000.0				1,250,000,000.0
Common stock, shares outstanding (in shares)				766,100,000				766,100,000
Shares registered for purchase (in shares)										19,300,000
Option to receive dividend, percentage reinvested in common stock										50.00%
Common Class A | Cottage Holdco B.V.
Class of Stock [Line Items]
Parent ownership percentage				61.00%				61.00%
Common Class A | Incremental Repurchase Program
Class of Stock [Line Items]
Authorized repurchase amount | $											$ 500,000,000.0
Number of shares repurchased (in shares)				0				0
Share repurchase program, remaining authorized repurchase amount | $				$ 396,800,000				$ 396,800,000
Series A Preferred Stock
Class of Stock [Line Items]
Votes per share | vote				0				0
Preferred stock, shares authorized (in shares)				1,500,000				1,500,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01
Preferred stock, shares issued (in shares)				1,500,000				1,500,000
Preferred stock, shares outstanding (in shares)				1,500,000				1,500,000
Series A Preferred Stock | Other Noncurrent Liabilities
Class of Stock [Line Items]
Preferred stock classified as equity | $				$ 900,000				$ 900,000
Series A-1 Preferred Stock
Class of Stock [Line Items]
Votes per share | vote				0				0
Preferred stock, shares authorized (in shares)				0				0
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01				$ 0.01
Preferred stock, shares issued (in shares)				0				0
Preferred stock, shares outstanding (in shares)				0				0
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01
Sale of stock, shares authorized (in shares)			1,000,000
Sale of stock, maximum purchase price received | $			$ 1,000,000,000.0
Sale of stock, price per share (in dollars per share) | $ / shares			$ 1,000
Sale of stock, number of shares issued (in shares)	250,000	750,000
Sale of stock, consideration received | $	$ 250,000,000.0	$ 750,000,000.0
Preferred stock, dividend rate	9.00%	9.00%
Dividends payable | $				$ 84,600,000				$ 84,600,000	$ 6,500,000
Payments of dividends | $								$ 0
Series B Preferred Stock | Sale of Stock, Initial Issuance
Class of Stock [Line Items]
Sale of stock, shares authorized (in shares)			750,000
Series B Preferred Stock | Sale of Stock, Second Issuance
Class of Stock [Line Items]
Sale of stock, shares authorized (in shares)			250,000