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Net Income (Loss) Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | 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 |
Historical Outstanding Anti-Dilutive Securities | 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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&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/2003/role/presentationRef -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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