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Earnings Per Share (Notes) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Earnings per share | 10. 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 data):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income | $ | 48.8 |  |  | $ | 43.1 |  |  | $ | 92.6 |  |  | $ | 78.0 |
Weighted-average number of common shares outstanding - basic | 52.5 |  |  | 52.8 |  |  | 52.7 |  |  | 52.7 |
Dilutive effect of share equivalents | 0.5 |  |  | 0.6 |  |  | 0.4 |  |  | 0.6 |
Number of common shares and share equivalents outstanding - diluted | 53.0 |  |  | 53.4 |  |  | 53.1 |  |  | 53.3 |
Basic earnings per share | $0.93 |  | $0.82 |  | $1.76 |  | $1.48
Diluted earnings per share | $0.92 |  | $0.81 |  | $1.74 |  | $1.46
Anti-dilutive share equivalents (1) | 0.5 |  |  | 0.2 |  |  | 0.3 |  |  | 0.3 |
_____ (1) Anti-dilutive stock-based awards that were excluded from the calculation of the number of shares used to compute diluted earnings per share because they were anti-dilutive when applying the treasury-stock method.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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