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Net Income Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The Company's basic net income per share amounts have been computed by dividing net income by the weighted average number of shares of Common Stock and Class A Stock outstanding. Net income per share is presented on a combined basis, inclusive of Common Stock and Class A Stock outstanding, as each class of stock has equivalent economic rights. Diluted net income per share includes the potential dilutive effect of other securities as if such securities were converted or exercised during the period, when the effect is dilutive. 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 |
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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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