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%