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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 132.4 |  |  | $ | 91.7 |  |  | $ | 401.2 |  |  | $ | 234.5 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 55.5 |  |  |  | 55.2 |  |  |  | 55.4 |  |  |  | 55.1 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units and stock appreciation rights |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.3 |  |  |  | 0.2 |
Shares used in net income per common share – diluted |  |  | 55.7 |  |  |  | 55.4 |  |  |  | 55.7 |  |  |  | 55.3 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.39 |  |  | $ | 1.66 |  |  | $ | 7.24 |  |  | $ | 4.26 |
Diluted |  | $ | 2.38 |  |  | $ | 1.66 |  |  | $ | 7.21 |  |  | $ | 4.24 |

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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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