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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net Income (Loss) Attributable to Parent	$ 351.3	$ 351.0	$ 638.4	$ 540.3
Denominator:
Denominator for basic earnings per share — weighted average common shares	373.3	376.8	374.2	376.3
Effect of dilutive securities:
Employee stock awards (shares)	4.4	7.1	4.7	7.5
Denominator for diluted earnings per share — adjusted weighted average common shares	377.7	383.9	378.9	383.8
Basic net income per common share attributable to Parent (in dollars per share)	$ 0.94	$ 0.93	$ 1.71	$ 1.44
Diluted net income per common share attributable to Parent (in dollars per share)	$ 0.93	$ 0.91	$ 1.68	$ 1.41

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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