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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Basic and Diluted Net Income (Loss) Per Share | The calculations of basic and diluted net income per share are as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income - basic and diluted |  | $ | 842.1 |  |  | $ | 669.6 |  |  | $ | 2,364.0 |  |  | $ | 1,323.8 |
(Shares in millions) |  |  |  |  |  |  |  |
Weighted average shares - basic |  | 105.5 |  |  | 109.4 |  |  | 108.3 |  |  | 109.2 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  | 7.8 |  |  | 4.8 |  |  | 7.3 |  |  | 5.5 |
Restricted stock |  | 0.6 |  |  | — |  |  | 0.5 |  |  | — |
Weighted average shares - diluted |  | 113.9 |  |  | 114.2 |  |  | 116.1 |  |  | 114.7 |
Net income per share - basic |  | $ | 7.98 |  |  | $ | 6.12 |  |  | $ | 21.83 |  |  | $ | 12.12 |
Net income per share - diluted |  | $ | 7.39 |  |  | $ | 5.86 |  |  | $ | 20.36 |  |  | $ | 11.54 |
Antidilutive Securities | Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive, include the following:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(Shares in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Stock options |  | 0.1 |  |  | 18.3 |  |  | 2.6 |  |  | 18.2 |
Restricted stock |  | — |  |  | 0.4 |  |  | — |  |  | 0.4 |

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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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