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NET INCOME PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Basic and diluted earnings per share | Basic and diluted net income per share are calculated using the treasury stock method.
(in millions, except per share data) | Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Basic |  |  |  |  |  |  |
Net income | $ | 409.6 |  |  | $ | 321.7 |  |  |  |  |
Average shares outstanding | 265.8 |  |  | 273.2 |  |  |  |  |
Basic net income per share | $ | 1.54 |  |  | $ | 1.18 |  |  |  |  |
Diluted |  |  |  |  |  |  |
Net income | $ | 409.6 |  |  | $ | 321.7 |  |  |  |  |
Average shares outstanding assuming dilution: |  |  |  |  |  |  |
Average shares outstanding | 265.8 |  |  | 273.2 |  |  |  |  |
Stock options and other contingently issuable shares (1) | 4.8 |  |  | 5.3 |  |  |  |  |
Non-vested restricted stock grants | — |  |  | 0.1 |  |  |  |  |
Average shares outstanding assuming dilution | 270.6 |  |  | 278.6 |  |  |  |  |
Diluted net income per share | $ | 1.51 |  |  | $ | 1.15 |  |  |  |  |
(1)There were no stock options and other contingently issuable shares excluded due to their anti-dilutive effect for the three months ended March 31, 2021. There were 1.4 million stock options and other contingently issuable shares excluded due to their anti-dilutive effect for the three months ended March 31, 2020.

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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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