EQUITY - Preferred Stock (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Dec. 28, 2016 USD ($) $ / shares shares	May 19, 2015 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2010 USD ($) series $ / shares shares
Class of Stock [Line Items]
Number of preferred stock series issued | series					2
Dividends | $	$ 0.7		$ 66.7	$ 56.9
Preferred stock, company repurchase price per share upon change of control			$ 1,150
Preferred stock, change of control percentage			35.00%
Preferred stock, minimum holder voting percentage to demand registration of preferred stock			51.00%
Preferred stock, percentage of liquidation preference per annum paid upon company not satisfying demand for registration			1.50%
Preferred stock, liquidation preference per share (in dollars shares)			$ 1,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, stated value per share (in dollars per share)					$ 1,000
Convertible preferred stock issued (in shares) | shares					100,000
Issuance costs of preferred stock | $					$ 99.8
Convertible preferred stock, conversion price per share (in dollars per share)		$ 11.69
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock issued (in shares) | shares					32,550
Issuance costs of preferred stock | $					$ 32.5
Common Stock [Member]
Class of Stock [Line Items]
Conversion of preferred stock to common stock (in shares) | shares	3,366,973	8,554,948	3,366,973	8,554,948
Convertible preferred stock, conversion price per share (in dollars per share)	$ 9.67