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Acquisitions and Divestitures (Deconsolidation) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Jun. 30, 2025 | Sep. 30, 2024
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in net assets of and advances to equity affiliates |  | $ 5,227.8 | $ 4,792.5
Blue Hydrogen Industrial Gases Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Plant and equipment divested from deconsolidation | $ 600.0 |  |
Long-term debt divested from deconsolidation | $ 655.0 |  |
Investment in net assets of and advances to equity affiliates |  | $ 145.6 |
Air Products Qudra ("APQ") |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Subsidiary, ownership percentage |  | 51.00% |
Air Products Qudra ("APQ") | Blue Hydrogen Industrial Gases Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest percentage |  | 50.00% |

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