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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Number of shares excluded from computation of earnings per share											7.3
Numerator:
Net income	$ 313.2	$ 289.0	$ 229.2	$ 206.9	$ 283.6	$ 249.8	$ 195.1	$ 157.7	$ 1,038.4	$ 886.3	$ 750.7
Denominator:
Denominator for basic earnings per share - weighted average common shares									374.3	371.0	366.3
Effect of dilutive securities:
Employee stock awards									4.6	4.1	3.5
Denominator for diluted earnings per share - adjusted weighted average common shares									378.9	375.1	369.8
Basic net income per common share	$ 0.84	$ 0.77	$ 0.61	$ 0.55	$ 0.76	$ 0.67	$ 0.53	$ 0.43	$ 2.77	$ 2.39	$ 2.05
Net income per common share assuming dilution	$ 0.82	$ 0.76	$ 0.60	$ 0.55	$ 0.75	$ 0.66	$ 0.52	$ 0.42	$ 2.74	$ 2.36	$ 2.03

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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