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Debt Debt (Narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Sep. 25, 2020	Aug. 11, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Amount arranged			$ 500,000,000.0	$ 500,000,000.0
Borrowings outstanding	$ 0
Liabilities Subject to Compromise	7,313,700,000	$ 7,313,700,000			$ 7,313,700,000
Letters of credit outstanding, amount	116,600,000
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility	203,500,000	203,500,000
Line of Credit Facility, Current Borrowing Capacity	1,600,000,000
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise	7,096,300,000	7,096,300,000
Long-term Debt	7,096,300,000	7,096,300,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	581,000,000.0
Letters of credit outstanding, amount	26,000,000.0	27,000,000.0
Senior Notes | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise	6,500,000,000	6,500,000,000
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility	201,900,000	201,900,000
Convertible Debt [Member] | Three percent exchangeable senior notes due twenty twenty four [Member] | Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 849,500,000	$ 849,500,000

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