Exhibit 11.1

COMPUTATION OF NET INCOME PER SHARE

(In millions, except share information)

	For the Year Ended						For the Year Ended				For the Year Ended						For the Year Ended						For the Year Ended
	December 31, 2008						December 31, 2007				December 31, 2006						December 31, 2005						December 31, 2004
	Basic			Diluted			Basic		Diluted		Basic			Diluted			Basic			Diluted			Basic		Diluted
Income (loss) before cumulative effect of a change in accounting principle	$	(689.9	)	$	(689.9	)	$	241.5	$	241.5	$	(710.4	)	$	(710.4	)	$	(1,381.5	)	$	(1,381.5	)	$	422.2	$	422.2
After-tax interest expense on convertible debt		—			—			—		—		—			—			—			—			—		9.3
Income (loss) before cumulative effect of a change in accounting principle, for diluted net income (loss) per share		(689.9	)		(689.9	)		241.5		241.5		(710.4	)		(710.4	)		(1,381.5	)		(1,381.5	)		422.2		431.5
Cumulative effect of a change in accounting principle, net of tax		—			—			—		—		2.9			2.9			—			—			—		—
Net income (loss), for diluted net income (loss) per share	$	(689.9	)	$	(689.9	)	$	241.5	$	241.5	$	(707.5	)	$	(707.5	)	$	(1,381.5	)	$	(1,381.5	)	$	422.2	$	431.5
Weighted average shares:
Common shares outstanding		77,242,360			77,242,360			76,826,765		76,826,765		68,607,262			68,607,262			67,166,668			67,166,668			68,278,858		68,278,858
Exercise of common stock equivalents (1)		—			—			—		1,387,483		—			—			—			—			—		1,635,349
Shares issuable upon conversion of convertible debt (2)		—			—			—		—		—			—			—			—			—		4,813,056
Common and equivalent shares outstanding		77,242,360			77,242,360			76,826,765		78,214,248		68,607,262			68,607,262			67,166,668			67,166,668			68,278,858		74,727,263
Per common and equivalent share:
Income (loss) before cumulative effect of a change in accounting principle	$	(8.93	)	$	(8.93	)	$	3.14	$	3.09	$	(10.35	)	$	(10.35	)	$	(20.57	)	$	(20.57	)	$	6.18	$	5.77
Cumulative effect of a change in accounting principle		—			—			—		—		0.04			0.04			—			—			—		—
Net income (loss)	$	(8.93	)	$	(8.93	)	$	3.14	$	3.09	$	(10.31	)	$	(10.31	)	$	(20.57	)	$	(20.57	)	$	6.18	$	5.77

(1)	Amount represents the number of common shares issued assuming the exercise of dilutive common stock equivalents, including stock options, restricted stock units, performance units and stock appreciation rights, reduced by the number of shares which could have been purchased with the proceeds from the exercise of such common stock equivalents.
(2)	Amount represents the number of common shares issued assuming the conversion of convertible debt outstanding.