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Net Income per Share | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Net Income per Share | 15. Net Income per Share We compute net income per share of common stock using the treasury stock method. The numerators and denominators of the basic and diluted net income per share computations were calculated as follows:
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
|  | (Dollars in millions, except share and per share data) |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 8.6 |  |  | $ | 11.2 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic |  |  | 144,645,325 |  |  |  | 140,149,271 |
Effect of dilutive equity instruments |  |  | 6,533,173 |  |  |  | 6,892,957 |
Weighted-average shares outstanding - diluted |  |  | 151,178,498 |  |  |  | 147,042,228 |
Net income per share - basic |  | $ | 0.06 |  |  | $ | 0.08 |
Net income per share - diluted |  | $ | 0.06 |  |  | $ | 0.08 |
The following potentially dilutive weighted-average shares were excluded from the calculation of diluted net income per share because their effect would have been anti-dilutive:
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Stock options |  |  | 121,381 |  |  |  | 1,059,230 |
Restricted stock units |  |  | 21,869 |  |  |  | — |

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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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