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Earnings per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings per share | 13. 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):
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Net income |  | $ | 200.3 |  |  | $ | 174.7 |  |  | $ | 157.7 |
Weighted-average number of common shares outstanding - basic |  | 52.7 |  |  | 52.8 |  |  | 52.3 |
Dilutive effect of share equivalents |  | 0.6 |  |  | 0.6 |  |  | 0.8 |
Number of common shares and share equivalents outstanding - diluted |  | 53.3 |  |  | 53.4 |  |  | 53.1 |
Basic earnings per share |  | $ | 3.80 |  |  | $ | 3.31 |  |  | $ | 3.02 |
Diluted earnings per share |  | $ | 3.76 |  |  | $ | 3.28 |  |  | $ | 2.98 |
Number of anti-dilutive share equivalents |  | — |  |  | — |  |  | — |

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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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