Earnings per Share (EPS) (Details) - Entity [Domain] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Earnings per Share (EPS) (Textuals) [Abstract]
Antidilutive shares excluded from EPS calculation	8.5	3.1	8.5	4.4
EPS numerator:
Loss from continuing operations, net of income taxes	$ (1,007.2)	$ (72.0)	$ (1,171.6)	$ (116.3)
Less: Net income attributable to noncontrolling interests	1.8	2.1	5.1	6.5
Loss from continuing operations attributable to common stockholders, before allocation of earnings to participating securities	(1,009.0)	(74.1)	(1,176.7)	(122.8)
Less: Earnings allocated to participating securities	0.0	0.3	0.0	0.5
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities	(1,009.0)	(74.4)	(1,176.7)	(123.3)
(Loss) income from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities	(36.3)	0.8	(45.2)	1.0
Net loss attributable to common stockholders, after earnings allocated to participating securities	$ (1,045.3)	$ (73.6)	$ (1,221.9)	$ (122.3)
EPS denominator:
Weighted Average Number of Shares Outstanding, Basic	272.3	268.0	271.2	267.9
Weighted Average Number of Shares Outstanding, Diluted	272.3	268.0	271.2	267.9
Basic EPS attributable to common stockholders:
Loss from continuing operations	$ (3.71)	$ (0.28)	$ (4.34)	$ (0.46)
(Loss) income from discontinued operations	(0.13)	0.01	(0.17)	0.00
Net loss attributable to common stockholders	(3.84)	(0.27)	(4.51)	(0.46)
Diluted EPS attributable to common stockholders:
Loss from continuing operations	(3.71)	(0.28)	(4.34)	(0.46)
(Loss) income from discontinued operations	(0.13)	0.01	(0.17)	0.00
Net loss attributable to common stockholders	(3.84)	$ (0.27)	(4.51)	$ (0.46)
Common Stock [Member]
Earnings Per Share [Line Items]
Common Stock, par value per share	$ 0.01		$ 0.01		$ 0.01