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Issuance of Equity Securities (Details) - shares shares in Millions | 9 Months Ended | 12 Months Ended | 33 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Jan. 31, 2018 | Apr. 01, 2017
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Treasury stock, shares, acquired | 5.8 | 14.6 | 21.1 | 41.5 |  |
Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  |  |  | 70.9
Discount percent of common stock value |  |  |  |  |  | 35.00%
Convertible preferred stock, shares issued upon conversion |  |  |  |  |  | 46.2
Convertible Preferred Stock |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  | 0.0 | 30.0 | 0.0 | 30.0 |
Common Stock |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common stock, outstanding (in shares) |  | 139.2 | 137.7 | 139.2 |  |
Common Stock | Common Stock |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  |  | 59.3 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: 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(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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