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Net Income Per Common Share Computations (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following is a reconciliation of the numerator and denominator of the net income per common share computations:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions, except per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator for basic net income (loss) per common share: |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ | 108.3 |  |  | $ | (23.6) |  |  | $ | 144.4 |  |  | $ | (46.2) |
Net loss attributable to noncontrolling interest | — |  |  | — |  |  | — |  |  | (0.1) |
Net income (loss) from continuing operations, net of loss attributable to noncontrolling interests | 108.3 |  |  | (23.6) |  |  | 144.4 |  |  | (46.1) |
Net loss from discontinued operations | — |  |  | (95.2) |  |  | — |  |  | (96.1) |
Numerator for basic net income (loss) per common share | $ | 108.3 |  |  | $ | (118.8) |  |  | $ | 144.4 |  |  | $ | (142.2) |
Numerator for diluted net income (loss) from continuing operations per common share | $ | 108.3 |  |  | $ | (23.6) |  |  | $ | 144.4 |  |  | $ | (46.1) |
Numerator for diluted net income (loss) per common share | $ | 108.3 |  |  | $ | (118.8) |  |  | $ | 144.4 |  |  | $ | (142.2) |
Denominator for net income (loss) per common share: |  |  |  |  |  |  |
Basic | 38.7 |  |  | 39.5 |  |  | 38.8 |  |  | 39.6 |
Plus dilutive effect of stock awards | 0.6 |  |  | — |  |  | 0.6 |  |  | — |
Diluted | 39.3 |  |  | 39.5 |  |  | 39.4 |  |  | 39.6 |
Net income (loss) per common share data: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
Continuing operations | $ | 2.80 |  |  | $ | (0.59) |  |  | $ | 3.72 |  |  | $ | (1.16) |
Discontinued operations | $ | — |  |  | $ | (2.41) |  |  | $ | — |  |  | $ | (2.43) |
Net income (loss) per common share - basic | $ | 2.80 |  |  | $ | (3.00) |  |  | $ | 3.72 |  |  | $ | (3.59) |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | 2.76 |  |  | $ | (0.59) |  |  | $ | 3.66 |  |  | $ | (1.16) |
Discontinued operations | $ | — |  |  | $ | (2.41) |  |  | $ | — |  |  | $ | (2.43) |
Net income (loss) per common share - diluted | $ | 2.76 |  |  | $ | (3.00) |  |  | $ | 3.66 |  |  | $ | (3.59) |
Anti-dilutive stock awards excluded from the calculation of diluted shares | — |  |  | 0.5 |  |  | — |  |  | 0.5 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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