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Earnings Per Share (Notes) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Earnings per share | 10. Earnings per Share The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in millions):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Weighted average number of common shares outstanding used to compute basic earnings per share | 52.8 |  |  | 52.3 |  |  | 52.7 |  |  | 52.2 |
Dilutive effect of stock-based awards | 0.6 |  |  | 0.7 |  |  | 0.6 |  |  | 0.7 |
Number of shares used to compute diluted earnings per share | 53.4 |  |  | 53.0 |  |  | 53.3 |  |  | 52.9 |
During the three and six months ended June 30, 2019, there were 0.2 million and 0.3 million share equivalents outstanding that were excluded from the computation of diluted earnings per share because they were anti-dilutive when applying the treasury stock method. During the three and six months ended June 30, 2018 the amount of anti-dilutive share equivalents outstanding were insignificant.

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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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