Share-Based Payment Arrangement, Acquisition Related Expense

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- Definition

Share-Based Payment Arrangement, Expense, Increase in Fair Value of Liabilities

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- Definition

Share-Based Payment Arrangement, Non-Acquisition-Related Expense

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- Definition

Vesting Period in years for Shares

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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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- Definition

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

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Share-Based Compensation Narrative (Details) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($) Reportable_Segments shares	Sep. 30, 2024 USD ($)	Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit related to share-based compensation	$ 4.0	$ 4.0
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 110.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 53.0	53.0
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 59.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
Vesting Period in years for Shares \| Reportable_Segments	3
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 108.0	$ 45.0
Performance Share Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)	0.00%	0.00%
Performance Share Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)	240.00%	240.00%
GIA Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 310.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year		2 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 53.0
Share-Based Payment Arrangement, Acquisition Related Expense	61.0
Share-Based Payment Arrangement, Non-Acquisition-Related Expense	2.0
Share-Based Payment Arrangement, Expense, Increase in Fair Value of Liabilities	$ 10.0
2021 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant \| shares	15