Earning Per Share (Tables)

9 Months Ended

Jun. 30, 2011

Earnings Per Share [Abstract]

Numerator and denominator used to compute basic and diluted earnings (loss) per share

	Three Months Ended				Nine Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
	(In millions)
Numerator:
Net income	$	28.7	$	50.5	$	36.0	$	253.9
Effect of dilutive securities:
Interest expense and amortization of issuance costs associated with convertible senior notes		—		—		—		23.1
Numerator for diluted earnings per share after assumed conversions	$	28.7	$	50.5	$	36.0	$	277.0
Denominator:
Denominator for basic earnings per share— weighted average common shares		318.7		318.2		319.0		318.0
Effect of dilutive securities:
Employee stock awards		0.3		0.9		0.3		0.6
Convertible senior notes		—		—		—		38.3
Denominator for diluted earnings per share— adjusted weighted average common shares		319.0		319.1		319.3		356.9