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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Basic and diluted net income per share are calculated using the treasury stock method.
(in millions, except per share data) | 2021 |  | 2020 |  | 2019
Basic |  |  |  |  |
Net income | $ | 1,864.4 |  |  | $ | 2,030.4 |  |  | $ | 1,541.3 |
Average shares outstanding | 262.5 |  |  | 271.3 |  |  | 275.4 |
Basic net income per share | $ | 7.10 |  |  | $ | 7.48 |  |  | $ | 5.60 |
Diluted |  |  |  |  |
Net income | $ | 1,864.4 |  |  | $ | 2,030.4 |  |  | $ | 1,541.3 |
Average shares outstanding assuming dilution: |  |  |  |  |
Average shares outstanding | 262.5 |  |  | 271.3 |  |  | 275.4 |
Stock options and other contingently issuable shares (1) | 4.6 |  |  | 4.5 |  |  | 4.8 |
Non-vested restricted stock grants | — |  |  | — |  |  | 0.1 |
Average shares outstanding assuming dilution | 267.1 |  |  | 275.8 |  |  | 280.3 |
Diluted net income per share | $ | 6.98 |  |  | $ | 7.36 |  |  | $ | 5.50 |
(1) Stock options and other contingently issuable shares excludes 0.9 million, 1.0 million and 1.3 million shares at December 31, 2021, 2020 and 2019, respectively, due to their anti-dilutive effect.

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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=124432515&loc=d3e3550-109257 + Details
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