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Earnings (Loss) per Share - Antidilutive Securities and Reconciliation of Weighted-Average Common Shares Outstanding (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Anti-dilutive securities, stock options (in shares) | 0.0 | 2.4 | 0.7
Stock options |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Assumed conversion of dilutive stock options and dilutive RSAs (in shares) | 3.0 |  |
Restricted stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Assumed conversion of dilutive stock options and dilutive RSAs (in shares) | 0.5 |  |
Convertible preferred stock |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Assumed conversion of convertible preferred shares (in shares) | 0.7 |  |
Convertible debt securities |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Assumed conversion of convertible debt (in shares) | 9.1 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1930-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2029-109256 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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