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v3.25.2

Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Notes payable | $ 4,002.9 |  | $ 3,004.1
Less: current portion | (1.0) |  | (1.1)
Less: unamortized discount and debt issuance costs | (27.2) |  | (11.7)
Total long-term debt | $ 3,974.7 |  | 2,991.3
Fixed-rate 3.375% notes due September 15, 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 3.375% |  |
Effective Interest Rate | 3.47% |  |
Notes payable | $ 0.0 |  | 1,000.0
Fixed-rate 1.700% notes due May 15, 2028 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 1.70% |  |
Effective Interest Rate | 1.85% |  |
Notes payable | $ 1,000.0 |  | 1,000.0
Fixed-rate 1.250% notes due September 1, 2030 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 1.25% |  |
Effective Interest Rate | 1.83% |  |
Notes payable | $ 1,000.0 |  | 1,000.0
Fixed-rate 4.750% notes due May 8, 2032 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 4.75% |  |
Effective Interest Rate | 4.95% |  |
Notes payable | $ 1,000.0 |  | 0.0
Fixed-rate 4.450% notes due September 9, 2034 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 4.45% | 4.45% |
Effective Interest Rate | 4.75% |  |
Notes payable | $ 1,000.0 |  | 0.0
Other |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable | $ 2.9 |  | $ 4.1

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