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Net income per share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Net Income per Share | The following table presents the calculation of basic and diluted net income per share:
| Three Months Ended June 30, | Six Months Ended June 30,
2021 |  | 2020 | 2021 |  | 2020
Numerator: |  |  |  |  |  |
Net income | $ | 4.6 |  |  | $ | 92.7 |  | $ | 74.3 |  |  | $ | 80.2 |
Denominator: |  |  |  |  |  |
Weighted-average number of shares—basic | 53.6 |  |  | 52.6 |  | 53.5 |  |  | 52.3 |
Dilutive securities—equity awards | 0.4 |  |  | 0.9 |  | 0.8 |  |  | 0.9 |
Weighted-average number of shares—diluted | 54.0 |  |  | 53.5 |  | 54.3 |  |  | 53.2 |
Net income per share - basic | $ | 0.09 |  |  | $ | 1.76 |  | $ | 1.40 |  |  | $ | 1.53 |
Net income per share - diluted | $ | 0.09 |  |  | $ | 1.73 |  | $ | 1.37 |  |  | $ | 1.51 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table presents the share-based awards that are not considered in the diluted net income per share calculation because the exercise price of the awards was greater than the average per share closing price during the three and six months ended June 30, 2021 and 2020.
| Three Months Ended June 30, | Six Months Ended June 30,
| 2021 |  | 2020 | 2021 |  | 2020
Anti-dilutive stock awards | 1.4 |  |  | 0.4 |  | 0.5 |  |  | 0.6 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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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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