Share-Based Payments (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance (in shares)	14.9
Shares available for future awards (in shares)	2.6
Share-based compensation expense	$ 23.9	$ 27.3	$ 19.2
Tax benefit recognized for share-based compensation arrangements	$ 5.7	$ 6.6	$ 4.6
Share options granted (in shares)	0.3
RSE awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive awards excluded from the calculation of diluted weighted-average shares outstanding (in shares)	0.2	0.0	0.1
Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Expiration period (in years)	10 years
Share options granted (in shares)	0.3	0.2
Compensation expense to be recognized over vesting period	$ 4.6	$ 3.1
Unrecognized compensation expense, share options	$ 4.4
Unrecognized compensation expense, weighted-average period to recognize (in years)	1 year 6 months
PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, weighted-average period to recognize (in years)	2 years 9 months 18 days
Unrecognized compensation expense, RSE awards	$ 7.8
Weighted-average grant date fair value, granted (in usd per share)	$ 63.75	$ 56.53	$ 29.25
Estimated fair value of vested awards	$ 12.5
RSE awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, weighted-average period to recognize (in years)	2 years 2 months 12 days
Unrecognized compensation expense, RSE awards	$ 24.9
Weighted-average grant date fair value, granted (in usd per share)	$ 42.49	$ 35.16	$ 29.25
Estimated fair value of vested awards	$ 15.4	$ 13.2	$ 11.5

Employee Share Based Compensation, Granted Awards, Total Compensation To Be Recognized

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under 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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Gross number of share options (or share units) granted during the period.

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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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