LEASES (Details) $ in Millions		12 Months Ended
	Apr. 17, 2020 USD ($) hydrogenPlants	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of Hydrogen Plants Sold | hydrogenPlants	5
Sale Leaseback Transaction, Gross Proceeds, Investing Activities	$ 530.0
Gain (Loss) on Disposition of Property Plant Equipment		$ 477.8	$ 29.9	$ 43.1
Lease right of use assets - affiliate						$ 853.9
Operating Lease, Liability		1,405.2				$ 853.9
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		291.2	239.6
Air Products and Chemical, Inc.
Lessee, Lease, Description [Line Items]
Sale Leaseback Transaction, Gross Proceeds, Investing Activities	$ 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
Lease with Affiliate [Member]
Lessee, Lease, Description [Line Items]
Lease right of use assets - affiliate		$ 571.0	650.3
Operating lease costs		$ 129.1	$ 130.0
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
Hydrogen Supply | Air Products and Chemical, Inc.
Lessee, Lease, Description [Line Items]
Non-cancelable operating lease term					15 years
Lease right of use assets - affiliate					$ 504.0
Operating Lease, Liability					$ 504.0