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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			73 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 105.23			$ 105.23
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		$ 340.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	$ 170.0
Share-based Payment Arrangement, Noncash Expense	34.4	28.1	$ 23.0
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	5.2	16.1	8.9
Remaining availability	217.5			$ 217.5
Payments for Repurchase of Common Stock	117.2	0.0	50.0
Payment, Tax Withholding, Share-based Payment Arrangement	$ 4.7	$ 14.1	10.6
Treasury stock (in shares)	21,832,623	21,201,522		21,832,623
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	15,300,000			15,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,800,000			1,800,000
Employee Tax Withholding For Restricted and Deferred Stock Distributions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for Repurchase of Common Stock			$ 10.6
Treasury Stock, Shares, Acquired	(48,908)	158,182	158,668
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term	10 years
Total intrinsic value of options exercised	$ 17.7	$ 54.7	$ 19.4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 6.3			$ 6.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days
Share-based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total vest date fair value of shares that vested	$ 16.6	21.9	14.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 19.5			19.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total vest date fair value of shares that vested	$ 8.0	16.4	$ 14.2
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 10.8			10.8
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)	1,200,000		800,000
Value of shares repurchased	$ (117.2)		$ 50.0	292.5
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	9.0	1.1
Pension Plan [Member] \| Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 4.2	$ 4.0		$ 4.2