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Net Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Net Earnings Per Common Share | Net Earnings Per Common Share The following table shows the calculation of basic and diluted net earnings per common share:
|  |  |  | Three Months Ended March 31,
(In millions, except per share amounts) |  |  |  |  |  | 2021 |  | 2020
Basic Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | $ | 110.1 |  |  | $ | 126.6 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  |  |  |  |  | — |  |  | (0.1) |
Net earnings available to common stockholders |  |  |  |  |  | $ | 110.1 |  |  | $ | 126.5 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 154.1 |  |  | 154.5 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Basic net earnings per common share |  |  |  |  |  | $ | 0.71 |  |  | $ | 0.82 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings available to common stockholders |  |  |  |  |  | $ | 110.1 |  |  | $ | 126.5 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 154.1 |  |  | 154.5 |
Effect of dilutive stock shares and units |  |  |  |  |  | 1.3 |  |  | 0.3 |
Weighted average number of common shares outstanding - diluted under treasury stock |  |  |  |  |  | 155.4 |  |  | 154.8 |
Diluted net earnings per common share |  |  |  |  |  | $ | 0.71 |  |  | $ | 0.82 |

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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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