General - Income Taxes - Effective Income Tax Rates (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Income Taxes
Effective income tax rates (as a percent)	791.90%	51.30%
Nonrecurring tax benefit for tax basis in excess of net book value for certain assets to be included in the MCC Sale	$ 39.0

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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