EQUITY - Narrative (Details)						3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 17, 2015 USD ($) $ / shares	Dec. 03, 2015 shares	Oct. 15, 2015 USD ($)	Sep. 11, 2015 USD ($) $ / shares	Jul. 08, 2015 USD ($) shares	Dec. 31, 2015 USD ($) vote $ / shares shares	Dec. 31, 2014 $ / shares	Dec. 31, 2015 USD ($) vote $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares shares	Oct. 01, 2015 USD ($)	Aug. 13, 2015 USD ($)
Class of Stock [Line Items]
Share-based compensation								$ (12,000,000)	$ (8,100,000)
Reclassification of CS from liability to APIC									$ 29,500,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.01		$ 0.01		$ 0.01
Preferred stock, shares authorized | shares						20,000,000.0		20,000,000.0		20,000,000.0
Preferred stock, shares outstanding | shares						1,700,000.0		1,700,000.0		1,900,000.0
Repurchase amount												$ 700,000,000
Dividends declared (in dollars per share) | $ / shares				$ 0.25		$ 0	$ 0	$ 0.25	$ 0.20
Minimum
Class of Stock [Line Items]
Share purchase prices | $ / shares						$ 25.51
Maximum
Class of Stock [Line Items]
Share purchase prices | $ / shares								$ 30.35
Additional Paid-in Capital
Class of Stock [Line Items]
Reclassification of CS from liability to APIC								$ 13,800,000
Additional Paid-in Capital | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Reduction of dividend accrual recorded in prior period								500,000
Other Noncurrent Liabilities | RSU And Restricted Shares of Class A Common Stock
Class of Stock [Line Items]
Dividends payable											$ 1,100,000
Other Noncurrent Liabilities | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Dividends payable						$ 2,000,000		$ 2,000,000
Executive Officer | Accrued expenses and other current liabilities
Class of Stock [Line Items]
Recognized compensation expense										$ 13,900,000
Common Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares						$ 0.01		$ 0.01		$ 0.01
Number of votes per share | vote						1		1
Common stock, shares authorized | shares						800,000,000.0		800,000,000.0		800,000,000.0
Common stock, shares outstanding | shares						75,000,000		75,000,000		98,800,000
Share-based compensation					$ 100,000
Number of shares repurchased | shares						19,400,000		24,900,000
Aggregate fair value of shares repurchased						$ 544,300,000		$ 700,000,000
Common Class A | Greater than 5% of Class A Common Stock
Class of Stock [Line Items]
Number of shares repurchased | shares		1,000,000
Share purchase prices | $ / shares	$ 27.91
Aggregate fair value of shares repurchased	$ 27,900,000
Common Class A | Affiliated Entity
Class of Stock [Line Items]
Related liability | shares					1,400,000
Common Class B
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares						$ 0.01		$ 0.01		$ 0.01
Number of votes per share | vote						10		10
Common stock, shares authorized | shares						262,000,000		262,000,000		262,000,000
Common stock, shares outstanding | shares						262,000,000		262,000,000		262,000,000
Series A Preferred Stock
Class of Stock [Line Items]
Number of votes per share | vote						0		0
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.01		$ 0.01
Conversion price (in dollars per share)										$ 27.97
Series A Preferred Stock | Additional Paid-in Capital
Class of Stock [Line Items]
Share-based compensation								$ (500,000)
Series A Preferred Stock | Other Noncurrent Liabilities
Class of Stock [Line Items]
Share-based compensation								$ (500,000)
Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized | shares						20,000,000.0		20,000,000.0
Common Class A and B
Class of Stock [Line Items]
Dividends paid			$ 89,000,000	$ 90,100,000