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Earnings (loss) per share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings (loss) per share | Earnings (loss) per share Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all dilutive securities. The following table shows the basic and diluted earnings (loss) per share:
| For the three months ended September 30,
| 2018 |  | 2017
| Loss |  | Shares (in millions) |  | Per Share |  | Income |  | Shares (in millions) |  | Per Share
Net income (loss) | $ | (20.3 | ) |  |  |  |  |  | $ | 20.8 |  |  |  |  |
Amount allocated to common stockholders | 100.0 | % |  |  |  |  |  | 92.06 | % |  |  |  |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders | $ | (20.3 | ) |  | 87.6 |  |  | $ | (0.23 | ) |  | $ | 19.1 |  |  | 87.3 |  |  | $ | 0.22 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  |  |  | — |  |  | 0.9 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders with assumed conversion | $ | (20.3 | ) |  | 87.6 |  |  | $ | (0.23 | ) |  | $ | 19.1 |  |  | 88.3 |  |  | $ | 0.22 |
| For the nine months ended September 30,
| 2018 |  | 2017
| Loss |  | Shares (in millions) |  | Per Share |  | Income |  | Shares (in millions) |  | Per Share
Net income (loss) | $ | (1.2 | ) |  |  |  |  |  | $ | 12.8 |  |  |  |  |
Amount allocated to common stockholders | 100.0 | % |  |  |  |  |  | 92.04 | % |  |  |  |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders | $ | (1.2 | ) |  | 87.6 |  |  | $ | (0.01 | ) |  | $ | 11.8 |  |  | 87.3 |  |  | $ | 0.13 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  |  |  | — |  |  | 0.8 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders with assumed conversion | $ | (1.2 | ) |  | 87.6 |  |  | $ | (0.01 | ) |  | $ | 11.8 |  |  | 88.1 |  |  | $ | 0.13 |
| Three months ended September 30, |  | Nine months ended September 30,
Securities excluded from the calculation of diluted EPS (in millions): | 2018(1) |  | 2017 |  | 2018(1) |  | 2017
Share-based compensation | 1.3 |  |  | 0.5 |  |  | 1.4 |  |  | 0.5 |
(1) In periods when we report a net loss, share-based compensation awards with antidilutive effect on the loss per share calculation are excluded from the calculation of diluted weighted average shares outstanding.

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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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