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Commitments And Contingencies (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Trading Activity, Gains and Losses, Net [Line Items]
Contracted future purchases	$ 187.9
Railcar Operating Lease [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Lessee Operating Lease, Lease Not Yet Commenced	24.5
Building Operating Lease [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Lessee Operating Lease, Lease Not Yet Commenced	$ 1.2
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Minimum [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Operating Lease Remaining Lease Term	1 year
Minimum [Member] | Railcar Operating Lease [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Maximum [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Operating Lease Remaining Lease Term	17 years 1 month 6 days
Maximum [Member] | Railcar Operating Lease [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	6 years

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- Definition

Lessee Operating Lease, Lease Not Yet Commenced

+ References

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- Definition

Operating Lease Remaining Lease Term

+ References

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- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(19))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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