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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 |  |

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