Common Share Data (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ (34.0)		$ (66.3)		$ (33.5)		$ (79.2)
Numerator for basic earnings per share - income (loss) available to common stockholders	(34.0)		(66.3)		(33.5)		(79.2)
Adjustment for interest expense incurred on assumed conversions of convertible senior notes	0		0		0		0
Numerator for diluted earnings per share - income (loss) available to common stockholders after assumed conversions	$ (34.0)		$ (66.3)		$ (33.5)		$ (79.2)
Denominator for basic earnings per share - weighted-average shares (a)	255,747,273	[1]	254,972,652	[1]	255,609,699	[1]	254,873,612	[1]
Effect of dilutive securities - stock based compensation awards	0		0		0		0
Effect of dilutive securities - convertible senior notes	0		0		0		0
Denominator for diluted earnings per shares adjusted weighted average shares and assumed conversions (a) (in shares)	255,747,273	[1]	254,972,652	[1]	255,609,699	[1]	254,873,612	[1]
Earnings Per Share, Basic	$ (0.13)		$ (0.26)		$ (0.13)		$ (0.31)
Earnings Per Share, Diluted	$ (0.13)		$ (0.26)		$ (0.13)		$ (0.31)
Antidilutive common stock equivalents excluded from earnings per share computations	50,479,395		79,242,886		50,501,279		66,304,848
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common stock equivalents excluded from earnings per share computations	15,074,960		16,361,394		15,101,326		16,384,795
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common stock equivalents excluded from earnings per share computations	35,404,435		62,881,492		35,399,953		49,920,053

[1] (a) In calculating earnings per share, pertinent accounting rules require that common shares owned by the Company's Employee Savings and Stock Ownership Plan that are as yet unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding and have the same voting and other rights applicable to all other common shares.