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(Loss) earnings per share | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
(Loss) earnings per share | arnings 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 |
For the three and six months ended June 30, 2019 and 2018, basic earnings per share is computed by dividing net gain/(loss) by the weighted average number of shares of common stock outstanding during the period. For the three and six months ended June 30, 2019 and 2018, diluted earnings per share is computed using the treasury method by dividing net loss by the weighted average number of shares of common stock outstanding during the period, adjusted for the potential dilutive effect of other securities if such securities were converted or exercised and are not anti-dilutive. No adjustment for the potential dilutive effect of dilutive securities is reported as the effect would have been anti-dilutive for the three and six months ended June 30, 2019 due to the Company's net loss. The s hare-based awards that were excluded from the calculation of diluted loss per share, because they were anti-dilutive, were 3.0 million for the three and six months ended June 30, 2019.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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