LEASES (Details) $ in Millions		12 Months Ended
	Apr. 17, 2020 USD ($) hydrogenPlants	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 01, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Number of Hydrogen Plants Sold | hydrogenPlants	5
Proceeds from sale of assets	$ 530.0	$ 0.0	$ 543.1	$ 36.3
Gain (Loss) on Disposition of Property Plant Equipment		0.2	477.8	$ 29.9
Operating Lease, Liability		1,120.5
Net gains (losses) on sale-leaseback transactions		$ 0.0
Lessee, Lease Not Yet Commenced, Term Of Contract		15 years
Lessee, Leases Not Yet Commenced, Liability		$ 34.1
Operating lease costs		$ 299.1	291.2
Air Products and Chemical, Inc.
Lessee, Lease, Description [Line Items]
Proceeds from sale of assets	$ 530.0
Gain (Loss) on Disposition of Property Plant Equipment			471.1
Air Products and Chemical, Inc. | Transition Service Agreement
Lessee, Lease, Description [Line Items]
Supply Commitment, Period	18 months
Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term		1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term		20 years
Hydrogen Supply | Air Products and Chemical, Inc.
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term					15 years
Operating Lease, Right-of-Use Asset					$ 504.0
Operating Lease, Liability					$ 504.0
Lease with Affiliate [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset		$ 485.4	571.0
Operating lease costs		$ 129.1	$ 129.1
Lease with Affiliate [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term		7 years
Lease with Affiliate [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term		15 years