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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Share | The following table sets forth the computation of basic and diluted net income per share:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 73.7 |  |  | $ | 37.7 |  |  | $ | 142.8 |  |  | $ | 50.2 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 55,089,000 |  |  |  | 54,815,000 |  |  |  | 55,004,000 |  |  |  | 54,481,000 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units and stock appreciation rights |  |  | 178,000 |  |  |  | 274,000 |  |  |  | 248,000 |  |  |  | 485,000 |
Shares used in net income per common share – diluted |  |  | 55,267,000 |  |  |  | 55,089,000 |  |  |  | 55,252,000 |  |  |  | 54,966,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.34 |  |  | $ | 0.69 |  |  | $ | 2.60 |  |  | $ | 0.92 |
Diluted |  | $ | 1.33 |  |  | $ | 0.69 |  |  | $ | 2.58 |  |  | $ | 0.91 |

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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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