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Significant Risks and Uncertainties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Reduction of maximum loss due to counterparty credit risk by master netting provision	$ 44.2
Allowance for doubtful accounts	$ 0.1	$ 0.0
Commercial Relationship [Member] | Consolidated Revenues [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenues	11.00%	12.00%	15.00%
Maximum [Member]
Concentration Risk [Line Items]
Potential loss attributable to individual counterparties	$ 17.5
Minimum [Member]
Concentration Risk [Line Items]
Potential loss attributable to individual counterparties	$ 0.8

X

- Definition

Reduction in maximum loss due to counterparty credit risk by master netting provision in the event that all counterparties with whom the entity has asset positions default.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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