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(Loss) earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Basic and Diluted Net Income per Share | The following table presents the calculation of basic and diluted net (loss) income per share:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | $ | (9.5 | ) |  | $ | 50.1 |  |  | $ | (35.6 | ) |  | $ | 45.2 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average number of shares—basic |  | 51.5 |  |  | 49.9 |  |  | 51.3 |  |  | 49.7 |
Dilutive securities—equity awards |  | — |  |  | 1.3 |  |  | — |  |  | 1.3 |
Weighted-average number of shares—diluted |  | 51.5 |  |  | 51.2 |  |  | 51.3 |  |  | 51.0 |
Net (loss) earnings per share - basic |  | $ | (0.18 | ) |  | $ | 1.00 |  |  | $ | (0.69 | ) |  | $ | 0.91 |
Net (loss) earnings per share - diluted |  | $ | (0.18 | ) |  | $ | 0.98 |  |  | $ | (0.69 | ) |  | $ | 0.89 |

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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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