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No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

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- Definition

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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- Definition

The number of grants made 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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- Definition

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).

+ References

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- Definition

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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- Definition

Percentage of vesting of award under share-based payment arrangement.

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Employee Benefit Plans (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) grant_recipient $ / shares shares	Mar. 31, 2025 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Noncash Expense			$ 76.0	$ 75.2
Performance Shares [Member] \| October Two Thousand Twenty Five Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in the period \| shares			374,025
Award vesting period			3 years
Share-based Payment Arrangement, Noncash Expense	$ 5.1		$ 8.9
Fair value of equity awards on the date of grant (in US$ per unit) \| $ / shares			$ 157.79
Performance Shares [Member] \| October Two Thousand Twenty Five Grant \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total units granted that vest in the period			0.00%
Performance Shares [Member] \| October Two Thousand Twenty Five Grant \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total units granted that vest in the period			300.00%
Time-Based RSU \| First Quarter Two Thousand Twenty Six time-based RSU Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in the period \| shares			670,000
Share-based Payment Arrangement, Noncash Expense	5.0		$ 16.8
Fair value of equity awards on the date of grant (in US$ per unit) \| $ / shares			$ 143.05
RSU Grant Recipients \| grant_recipient			1,600
Time-Based RSU \| First Quarter Two Thousand Twenty Six time-based RSU Grants \| Retirement Eligible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Noncash Expense			$ 8.1
Time-Based RSU \| First Quarter Two Thousand Twenty Six time-based RSU Grants \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Time-Based RSU \| First Quarter Two Thousand Twenty Six time-based RSU Grants \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Noncash Expense	$ 31.9	$ 29.8	$ 69.5	$ 69.8