Earnings Per Share (Tables)

9 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the computation of basic and diluted earnings per share under the two-class method (in millions, except per share data):

	Three Months Ended				Nine Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Numerator:
Net income attributable to common stockholders	$	252.6	$	268.2	$	552.1	$	1,626.5
Less: Distributed and undistributed income    available to participating securities		—		—		—		(0.2	)
Distributed and undistributed income available to    common stockholders	$	252.6	$	268.2	$	552.1	$	1,626.3
Denominator:
Basic weighted average shares outstanding		257.3		256.1		256.2		255.7
Effect of dilutive stock options and non-    participating securities		1.3		4.5		2.9		4.3
Diluted weighted average shares outstanding		258.6		260.6		259.1		260.0
Basic earnings per share attributable to common    stockholders	$	0.98	$	1.05	$	2.15	$	6.36
Diluted earnings per share attributable to common    stockholders	$	0.98	$	1.03	$	2.13	$	6.25