Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 62.9	$ 116.2
Operating Lease, Right-of-Use Asset	933.7	933.7	$ 853.9
Operating Lease, Liability, Current	152.6	152.6
Operating Lease, Liability, Noncurrent	$ 766.4	$ 766.4
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	20 years	20 years
Hydrogen Supply [Member]
Lessee, Lease, Description [Line Items]
Lessee, Leases Not Yet Commenced, Liability	$ 212.6	$ 212.6
Lease with Affiliate [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	36.7	64.0
Operating Lease, Right-of-Use Asset	683.0	683.0	$ 604.4	$ 0.0
Operating Lease, Liability, Current	72.5	72.5		0.0
Operating Lease, Liability, Noncurrent	$ 610.5	$ 610.5		$ 0.0
Lease with Affiliate [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	7 years	7 years
Lease with Affiliate [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	15 years	15 years
Hydrogen Supply - Second Quarter 2020 [Member]
Lessee, Lease, Description [Line Items]
Lessee, Lease Not Yet Commenced, Term Of Contract		15 years
Port of Los Angeles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Leases Not Yet Commenced, Liability	$ 238.6	$ 238.6
Lessee, Lease Not Yet Commenced, Term Of Contract		30 years