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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Net Income Per Share | Basic and diluted net income per share are calculated using the treasury stock method.
| 2019 |  | 2018 |  | 2017
Basic |  |  |  |  |
Average shares outstanding | 91,803,528 |  |  | 92,992,457 |  |  | 92,908,638 |
Net income: |  |  |  |  |
Continuing operations | $ | 1,541.3 |  |  | $ | 1,108.7 |  |  | $ | 1,769.5 |
Discontinued operations |  |  |  |  |  |  | (41.6 | )
Net income | $ | 1,541.3 |  |  | $ | 1,108.7 |  |  | $ | 1,727.9 |
Basic net income per share: |  |  |  |  |
Continuing operations | $ | 16.79 |  |  | $ | 11.92 |  |  | $ | 19.04 |
Discontinued operations |  |  |  |  |  |  | (0.44 | )
Net income per share | $ | 16.79 |  |  | $ | 11.92 |  |  | $ | 18.60 |
Diluted |  |  |  |  |
Average shares outstanding | 91,803,528 |  |  | 92,992,457 |  |  | 92,908,638 |
Stock options and other contingently issuable shares (1) | 1,601,213 |  |  | 1,938,586 |  |  | 1,931,157 |
Non-vested restricted stock grants | 42,101 |  |  | 57,027 |  |  | 87,418 |
Average shares outstanding assuming dilution | 93,446,842 |  |  | 94,988,070 |  |  | 94,927,213 |
Net income: |  |  |  |  |
Continuing operations | $ | 1,541.3 |  |  | $ | 1,108.7 |  |  | $ | 1,769.5 |
Discontinued operations |  |  |  |  |  |  | (41.6 | )
Net income | $ | 1,541.3 |  |  | $ | 1,108.7 |  |  | $ | 1,727.9 |
Diluted net income per share: |  |  |  |  |
Continuing operations | $ | 16.49 |  |  | $ | 11.67 |  |  | $ | 18.64 |
Discontinued operations |  |  |  |  |  |  | (0.44 | )
Net income per share | $ | 16.49 |  |  | $ | 11.67 |  |  | $ | 18.20 |
(1) Stock options and other contingently issuable shares excludes 449,167, 28,321 and 638,795 shares at December 31, 2019, 2018 and 2017, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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