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Nature of Operations and Summary of Significant Accounting Policies - Capitalized Interest and Maintenance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Interest
Capitalized interest costs	$ 1.7	$ 1.6	$ 1.5
Long-lived maintenance assets written off	$ 3.7

X

- Definition

Amount of divestiture of assets representing future economic benefits arising from long-lived maintenance.

+ References

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X

- Definition

Amount of interest capitalized, including amount of allowance for funds used during construction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433

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