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v3.26.1

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

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