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Net Income (Loss) Per Common Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Net Loss Per Common Share | Net Income (Loss) Per Common Share Basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding for the period, without consideration for common stock equivalents. Diluted net income (loss) per share is computed using the weighted average number of common shares outstanding and, when dilutive, potential common share equivalents from outstanding options and unvested RSUs settleable in shares of common stock (using the treasury-stock method), and potential common shares from convertible securities (using the if-converted method). The following table sets forth the computation of basic and diluted net income (loss) per share (in millions, except per share data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income (loss) | $ | 30.2 |  |  | $ | 2.9 |  |  | $ | 6.0 |  |  | $ | (38.8 | )
Net income (loss) per common share: |  |  |  |  |  |  |
Basic | $ | 0.34 |  |  | $ | 0.03 |  |  | $ | 0.07 |  |  | $ | (0.45 | )
Diluted | $ | 0.34 |  |  | $ | 0.03 |  |  | $ | 0.07 |  |  | $ | (0.45 | )
Basic weighted average shares outstanding | 88.2 |  |  | 86.4 |  |  | 87.7 |  |  | 85.8 |
Effect of potentially dilutive stock options | 0.2 |  |  | 0.4 |  |  | 0.3 |  |  | — |
Effect of potentially dilutive share-based awards | 1.0 |  |  | 0.6 |  |  | 0.8 |  |  | — |
Diluted weighted average shares outstanding | 89.4 |  |  | 87.4 |  |  | 88.8 |  |  | 85.8 |
Outstanding anti-dilutive securities not included in diluted net income (loss) per share attributable to common stockholders calculation (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Options outstanding to purchase common stock | — |  |  | — |  |  | — |  |  | 0.4 |
Unvested restricted stock units | — |  |  | 0.1 |  |  | 0.4 |  |  | 3.0 |
Senior convertible notes | 4.0 |  |  | 4.0 |  |  | 4.0 |  |  | 4.0 |
Total | 4.0 |  |  | 4.1 |  |  | 4.4 |  |  | 7.4 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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