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Earnings Per Share - Convertible Senior Notes and Warrants (Details) - $ / shares shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |
Stock-based awards excluded from diluted EPS calculation (antidilutive) (in shares) | 0.4 |  | 0.8 | 0.5 | 0.8
Treasury stock, shares, acquired |  | 3.7 |  |  |
Class of warrant or right, exercise price of warrants or rights |  | $ 180.00 |  |  |
Convertible Debt Securities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stock-based awards excluded from diluted EPS calculation (antidilutive) (in shares) | 3.7 | 3.7 |  | 3.7 |
Common stock, conversion price (in dollars per share) | $ 126.00 | $ 126.00 |  |  |

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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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