Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Sale and Leaseback Transaction, Gain (Loss), Net	$ 0.0	$ 0.0
Operating lease cost	60.5	53.3
Operating Lease, Liability, Current	160.0
Operating Lease, Liability, Noncurrent	$ 799.8
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	20 years
Hydrogen Supply [Member]
Lessee, Lease, Description [Line Items]
Lessee, Leases Not Yet Commenced, Liability	$ 212.6
Lease with Affiliate [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	32.3	$ 27.1
Operating Lease, Right-of-Use Asset	631.2		$ 650.3
Operating Lease, Liability, Current	80.6		79.2
Operating Lease, Liability, Noncurrent	$ 550.5		$ 571.1
Lease with Affiliate [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	7 years
Lease with Affiliate [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	15 years
Hydrogen Supply - Second Quarter 2020 [Member]
Lessee, Lease, Description [Line Items]
Lessee, Lease Not Yet Commenced, Term Of Contract	15 years