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Income Per Common Share Computations (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator for basic net income per common share: |  |  |  |  |  |  |
Net income from continuing operations | $ | 58.0 |  |  | $ | 13.1 |  |  | $ | 175.3 |  |  | $ | 88.0 |
Net loss from continuing operations allocated to participating securities | — |  |  | — |  |  | — |  |  | (0.1 | )
Net (loss) income from discontinued operations | (1.7 | ) |  | 3.6 |  |  | 166.1 |  |  | 14.3 |
Numerator for basic net income per common share | $ | 56.3 |  |  | $ | 16.7 |  |  | $ | 341.4 |  |  | $ | 102.2 |
Numerator for diluted net income from continuing operations per common share | $ | 58.0 |  |  | $ | 13.1 |  |  | $ | 175.3 |  |  | $ | 88.0 |
Numerator for diluted net income per common share: | $ | 56.3 |  |  | $ | 16.7 |  |  | $ | 341.4 |  |  | $ | 102.3 |
Denominator for net income per common share: |  |  |  |  |  |  |
Basic | 13.6 |  |  | 15.3 |  |  | 13.8 |  |  | 15.9 |
Plus dilutive effect of stock awards | 0.1 |  |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
Plus dilutive effect of participating securities | — |  |  | — |  |  | — |  |  | 0.1 |
Diluted | 13.7 |  |  | 15.5 |  |  | 13.9 |  |  | 16.2 |
Net income (loss) per common share data: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
Continuing operations | $ | 4.27 |  |  | $ | 0.85 |  |  | $ | 12.65 |  |  | $ | 5.53 |
Discontinued operations | $ | (0.12 | ) |  | $ | 0.24 |  |  | $ | 11.99 |  |  | $ | 0.90 |
Net income per common share - basic | $ | 4.15 |  |  | $ | 1.09 |  |  | $ | 24.64 |  |  | $ | 6.43 |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | 4.24 |  |  | $ | 0.84 |  |  | $ | 12.58 |  |  | $ | 5.44 |
Discontinued operations | $ | (0.12 | ) |  | $ | 0.24 |  |  | $ | 11.92 |  |  | $ | 0.88 |
Net income per common share - diluted | $ | 4.12 |  |  | $ | 1.08 |  |  | $ | 24.50 |  |  | $ | 6.32 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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