Business and Asset Actions - Project Exit Costs (Details) - Project Exit Costs - USD ($) $ in Millions	3 Months Ended	10 Months Ended
	Dec. 31, 2025	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Business and asset actions, total pre-tax charge	$ 28.3
Business and asset actions, attributable to Air Products after tax	24.6
Project exit costs	28.3	$ 3,600.0
Noncash expenses		3,300.0
Impairment of property and equipment		2,500.0
Estimated effect on cash flows, total		360.0
Cash payments	25.7	200.0
Restructuring Reserve [Roll Forward]
Amount accrued at beginning of period	178.3
Changes in estimates	9.3
Cash payments	(25.7)	(200.0)
Currency translation adjustment	0.1
Amount accrued at end of period	162.0	$ 162.0
Operating income
Restructuring Cost and Reserve [Line Items]
Project exit costs	22.0
Other non‑operating income (expense), net
Restructuring Cost and Reserve [Line Items]
Project exit costs	$ 6.3