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Net Income Per Common Share Computations (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Calculation | The following is a reconciliation of the numerator and denominator of the net income (loss) per common share computations:
| Years Ended December 31,
(in millions, except per share data) | 2021 |  | 2020 |  | 2019
Numerator for basic net income (loss) per common share: |  |  |  |  |
Net income from continuing operations | $ | 249.1 |  |  | $ | 13.3 |  |  | $ | 139.6 |
Net loss attributable to noncontrolling interest | — |  |  | (0.2) |  |  | (0.3) |
Net income from continuing operations, net of loss attributable to noncontrolling interests | 249.1 |  |  | 13.5 |  |  | 139.9 |
Net loss from discontinued operations | — |  |  | (95.4) |  |  | (2.4) |
Numerator for basic net income (loss) per common share | $ | 249.1 |  |  | $ | (81.9) |  |  | $ | 137.5 |
Numerator for diluted net income from continuing operations per common share | $ | 249.1 |  |  | $ | 13.5 |  |  | $ | 139.9 |
Numerator for diluted net income (loss) per common share | $ | 249.1 |  |  | $ | (81.9) |  |  | $ | 137.5 |
Denominator for net income (loss) per common share: |  |  |  |  |
Basic | 38.6 |  |  | 39.6 |  |  | 40.1 |
Plus dilutive effect of stock awards | 0.6 |  |  | 0.5 |  |  | 0.5 |
Diluted | 39.2 |  |  | 40.1 |  |  | 40.6 |
Net income (loss) per common share data: |  |  |  |  |
Basic |  |  |  |  |
Continuing operations | $ | 6.45 |  |  | $ | 0.34 |  |  | $ | 3.49 |
Discontinued operations | $ | — |  |  | $ | (2.41) |  |  | $ | (0.06) |
Net income (loss) per common share - basic | $ | 6.45 |  |  | $ | (2.07) |  |  | $ | 3.43 |
Diluted |  |  |  |  |
Continuing operations | $ | 6.35 |  |  | $ | 0.33 |  |  | $ | 3.44 |
Discontinued operations (1) | $ | — |  |  | $ | (2.41) |  |  | $ | (0.06) |
Net income (loss) per common share - diluted | $ | 6.35 |  |  | $ | (2.08) |  |  | $ | 3.38 |
(1) Amounts exclude all potential common equivalent shares for periods when there is a net loss from discontinued operations.

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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=124432515&loc=d3e3550-109257 + Details
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