Supplemental Information (Divestitures) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Jan. 31, 2025	Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]
Investment in net assets of and advances to equity affiliates	$ 5,128.7		$ 4,792.5
Air Products Qudra ("APQ")
Schedule of Equity Method Investments [Line Items]
Subsidiary, Ownership Percentage, Parent		51.00%
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	$ 149.8
Blue Hydrogen Industrial Gases Company | Air Products Qudra ("APQ")
Schedule of Equity Method Investments [Line Items]
Percentage owned by a consolidated subsidiary	50.00%