CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) (unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2014	$ (77.0)	$ 1.8	$ 2,259.1	$ (1.0)	$ (2,548.0)	$ (204.4)	$ 415.5
Net income (loss)	(340.3)				(370.3)		30.0
Share-based compensation	5.9		5.9
Purchase of treasury stock	(1.0)			(1.0)
Change in accumulated other comprehensive income (loss)	(8.0)					(8.0)
Net distributions to noncontrolling interests	(42.6)						(42.6)
Balance at Jun. 30, 2015	(463.0)	1.8	2,265.0	(2.0)	(2,918.3)	(212.4)	402.9
Balance at Dec. 31, 2015	(595.6)	1.8	2,266.8	(2.0)	(3,057.0)	(187.2)	382.0
Net income (loss)	38.3				3.7		34.6
Issuance of common stock	249.4	0.6	248.8
Share-based compensation	3.2		3.2
Purchase of treasury stock	(0.3)			(0.3)
Change in accumulated other comprehensive income (loss)	41.4					41.4
Net distributions to noncontrolling interests	(37.0)						(37.0)
Balance at Jun. 30, 2016	$ (300.6)	$ 2.4	$ 2,518.8	$ (2.3)	$ (3,053.3)	$ (145.8)	$ 379.6