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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Share | The following is a reconciliation of basic to diluted net income per share:
|  | Years Ended December 31, |
Numerator: |  | 2020 |  |  | 2019 |  |  | 2018 |
Net income |  | $ | 350.1 |  |  | $ | 140.4 |  |  | $ | 392.9 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 55,095,000 |  |  |  | 54,711,000 |  |  |  | 54,406,000 |
Effect of dilutive securities |  |  | 255,000 |  |  |  | 400,000 |  |  |  | 586,000 |
Shares used in net income per common share – diluted |  |  | 55,350,000 |  |  |  | 55,111,000 |  |  |  | 54,992,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 6.36 |  |  | $ | 2.57 |  |  | $ | 7.22 |
Diluted |  | $ | 6.33 |  |  | $ | 2.55 |  |  | $ | 7.14 |

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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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