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Variable Interest Entities - NGHC Joint Venture Project Financing (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Variable Interest Entity [Line Items] |  |  |  |  |  |
Short-term borrowings |  | $ 536.2 |  | $ 536.2 |  | $ 83.5
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Voting interest in joint venture |  |  |  | 33.30% |  |
Value of engineering, procurement, and construction agreement | $ 6,700.0 |  |  |  |  |
Short-term borrowings |  | 71.0 |  | $ 71.0 |  | 51.6
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company | De-designated interest rate swap |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on de-designated cash flow hedging instruments, before tax |  | (0.3) | $ 11.2 | 27.0 | $ 11.2 |
Unrealized gain (loss) on de-designated cash flow hedging instruments, attributable to noncontrolling interest, before tax |  | (0.1) | 7.3 | 17.6 | 7.3 |
Unrealized gain (loss) on de-designated cash flow hedging instruments attributable to Air Products, after tax |  | (0.1) | $ 3.0 | 7.2 | $ 3.0 |
Variable Interest Entity, Primary Beneficiary | Nonrecourse | NEOM Green Hydrogen Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Total principal borrowings |  | 4,600.0 |  | 4,600.0 |  | 3,300.0
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Project Financing, Primary | Nonrecourse | NEOM Green Hydrogen Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Project financing maximum borrowing capacity |  | $ 6,100.0 |  | $ 6,100.0 |  |
Amount of expected debt funding (percent) |  | 73.00% |  | 73.00% |  |
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Project Financing, Working Capital | Nonrecourse | NEOM Green Hydrogen Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Project financing maximum borrowing capacity |  | $ 500.0 |  | $ 500.0 |  |
Variable Interest Entity, Primary Beneficiary | Saudi Riyal Loan Facility Variable-Rate 5.60% | NEOM Green Hydrogen Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Short-term borrowings |  | $ 71.1 |  | $ 71.1 |  | $ 51.6
Interest rate, variable percentage |  | 6.30% |  | 6.30% |  |

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