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v3.24.1.u1

Employee Benefit Plans (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) grant_recipient $ / shares shares | Mar. 31, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Noncash Expense |  |  | $ 65.9 | $ 51.3
Performance Shares [Member] | October Two Thousand Twenty Three Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
RSUs granted in the period | shares |  |  | 277,779 |
Award vesting period |  |  | 3 years |
Share-based Payment Arrangement, Noncash Expense |  |  | $ 6.8 |
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares |  |  | $ 146.72 |
Performance Shares [Member] | October Two Thousand Twenty Three 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 Three Grant | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of total units granted that vest in the period |  |  | 200.00% |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 22.1 | $ 26.0 | $ 59.4 | $ 47.1
Time-Based RSU | First Quarter Two Thousand Twenty Four Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
RSUs granted in the period | shares |  |  | 660,000 |
Share-based Payment Arrangement, Noncash Expense | 3.5 |  | $ 17.4 |
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares |  |  | $ 147.58 |
RSU Grant Recipients | grant_recipient |  |  | 1,460 |
Time-Based RSU | First Quarter Two Thousand Twenty Four Grant | Retirement Eligible |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 2.6 |  | $ 16.4 |

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