Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net Income (Loss) Attributable to Parent	$ 947.4	$ 958.7
Denominator:
Denominator for basic earnings per share — weighted average common shares	333.3	344.2
Effect of dilutive securities:
Employee stock awards (shares)	2.4	2.7
Denominator for diluted earnings per share — adjusted weighted average common shares	335.7	346.9
Basic net income per common share attributable to Parent (in dollars per share)	$ 2.84	$ 2.79
Diluted net income per common share attributable to Parent (in dollars per share)	$ 2.82	$ 2.76