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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings per share | The following is a reconciliation of the number of shares and share equivalents used to calculate basic and diluted earnings per share (in millions, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income | $ | 52.3 |  |  | $ | 57.4 |  |  | $ | 144.9 |  |  | $ | 135.4 |
Weighted-average number of common shares outstanding - basic | 52.5 |  |  | 52.8 |  |  | 52.6 |  |  | 52.7 |
Dilutive effect of share equivalents | 0.5 |  |  | 0.6 |  |  | 0.5 |  |  | 0.7 |
Number of common shares and share equivalents outstanding - diluted | 53.0 |  |  | 53.4 |  |  | 53.1 |  |  | 53.4 |
Basic earnings per share | $ | 1.00 |  |  | $ | 1.09 |  |  | $ | 2.75 |  |  | $ | 2.57 |
Diluted earnings per share | $ | 0.99 |  |  | $ | 1.08 |  |  | $ | 2.73 |  |  | $ | 2.54 |
Number of anti-dilutive share equivalents | — |  |  | — |  |  | 0.2 |  |  | 0.2 |

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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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