Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net Income (Loss) Attributable to Parent	$ 1,141.6	$ 791.8
Denominator:
Denominator for basic earnings per share — weighted average common shares	356.1	364.4
Effect of dilutive securities:
Employee stock awards (shares)	4.0	5.6
Denominator for diluted earnings per share — adjusted weighted average common shares	360.1	370.0
Basic net income per common share attributable to Parent (in dollars per share)	$ 3.21	$ 2.17
Diluted net income per common share attributable to Parent (in dollars per share)	$ 3.17	$ 2.14