Earnings Per Share (Tables)

6 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Numerator and denominator used to compute basic and diluted earnings per share

The following table sets forth the numerators and denominators used in the computation of basic and diluted earnings per share. Options to purchase 8.7 million and 9.1 million shares of common stock were excluded from the computation of diluted earnings per share for the 2015 and 2014 periods, respectively, because their effect would have been antidilutive.

	Three Months Ended   March 31,				Six Months Ended   March 31,
	2015		2014		2015		2014
	(In millions)
Numerator:
Net income	$	147.9	$	131.0	$	290.4	$	254.1
Effect of dilutive securities:
Interest and amortization of issuance costs associated with convertible senior notes, net of tax	—		6.9		—		13.7
Numerator for diluted earnings per share after assumed conversions	$	147.9	$	137.9	$	290.4	$	267.8
Denominator:
Denominator for basic earnings per share — weighted average common shares	365.8		324.3		365.4		323.7
Effect of dilutive securities:
Employee stock awards	3.6		3.4		3.4		3.1
Convertible senior notes	—		38.6		—		38.6
Denominator for diluted earnings per share — adjusted weighted average common shares	369.4		366.3		368.8		365.4
Basic net income per common share	$	0.40	$	0.40	$	0.79	$	0.79
Net income per common share assuming dilution	$	0.40	$	0.38	$	0.79	$	0.73