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Earnings (Loss) Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Earnings (Loss) Per Share | The following table presents the calculation of basic and diluted earnings (loss) per share:
| Three Months Ended |  |
| March 31, |  |
| 2021 |  | 2020 |  |  |  |
Net income (loss) from continuing operations | $ | 239.5 |  |  | $ | (232.2) |  |  |  |  |
Loss from discontinued operations, net of income taxes | (0.1) |  |  | (0.1) |  |  |  |  |
Net income (loss) | $ | 239.4 |  |  | $ | (232.3) |  |  |  |  |
Basic weighted average common shares outstanding | 83.1 |  |  | 90.0 |  |  |  |  |
Dilutive effect of stock options and unvested RSUs | 0.8 |  |  | — |  |  |  |  |
Diluted weighted average common shares outstanding | 83.9 |  |  | 90.0 |  |  |  |  |
Basic earnings (loss) per share amounts(1): |  |  |  |  |  |  |
Continuing operations | $ | 2.88 |  |  | $ | (2.58) |  |  |  |  |
Discontinued operations | $ | — |  |  | $ | — |  |  |  |  |
Net income (loss) | $ | 2.88 |  |  | $ | (2.58) |  |  |  |  |
Diluted earnings (loss) per share amounts(1): |  |  |  |  |  |  |
Continuing operations | $ | 2.85 |  |  | $ | (2.58) |  |  |  |  |
Discontinued operations | $ | — |  |  | $ | — |  |  |  |  |
Net income (loss) | $ | 2.85 |  |  | $ | (2.58) |  |  |  |  |
(1) Earnings (loss) per share amounts are calculated discretely and, therefore, may not add up to the total due to rounding.
Anti-Dilutive Equity Instruments Excluded From The Computation Of Diluted EPS | A summary of anti-dilutive equity instruments excluded from the computation of diluted earnings (loss) per share is as follows:
| Three Months Ended |  |
| March 31, |  |
| 2021 |  | 2020 |  |  |  |
Anti-dilutive equity instruments excluded from the computation of diluted earnings (loss) per share | — |  |  | 3.0 |  |  |  |  |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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