Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net Income (Loss) Attributable to Parent	$ 844.9	$ 947.4
Denominator:
Denominator for basic earnings per share — weighted average common shares	321.5	333.3
Effect of dilutive securities:
Employee stock awards (shares)	1.8	2.4
Denominator for diluted earnings per share — adjusted weighted average common shares	323.3	335.7
Basic net income per common share attributable to Parent (in dollars per share)	$ 2.63	$ 2.84
Diluted net income per common share attributable to Parent (in dollars per share)	$ 2.61	$ 2.82