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Income Per Common Share Computations | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Common Share Computations | 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) | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator for basic net income per common share: |  |  |  |  |  |  |
Net income from continuing operations | $ | 103.2 |  |  | $ | 72.7 |  |  | $ | 117.3 |  |  | $ | 74.9 |
Net loss from continuing operations allocated to participating securities | — |  |  | — |  |  | — |  |  | (0.1 | )
Net (loss) income from discontinued operations | (0.1 | ) |  | 5.6 |  |  | 167.8 |  |  | 10.7 |
Numerator for basic net income per common share | $ | 103.1 |  |  | $ | 78.3 |  |  | $ | 285.1 |  |  | $ | 85.5 |
Numerator for diluted net income from continuing operations per common share | $ | 103.2 |  |  | $ | 72.7 |  |  | $ | 117.3 |  |  | $ | 74.9 |
Numerator for diluted net income per common share: | $ | 103.1 |  |  | $ | 78.3 |  |  | $ | 285.1 |  |  | $ | 85.6 |
Denominator for net income per common share: |  |  |  |  |  |  |
Basic | 13.5 |  |  | 16.1 |  |  | 14.0 |  |  | 16.2 |
Plus dilutive effect of stock awards | 0.1 |  |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
Plus dilutive effect of participating securities | — |  |  | — |  |  | — |  |  | 0.1 |
Diluted | 13.6 |  |  | 16.3 |  |  | 14.1 |  |  | 16.5 |
Net income (loss) per common share data: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
Continuing operations | $ | 7.61 |  |  | $ | 4.52 |  |  | $ | 8.38 |  |  | $ | 4.62 |
Discontinued operations | $ | (0.01 | ) |  | $ | 0.34 |  |  | $ | 11.98 |  |  | $ | 0.65 |
Net income per common share - basic | $ | 7.60 |  |  | $ | 4.86 |  |  | $ | 20.36 |  |  | $ | 5.27 |
Diluted |  |  |  |  |  |  |
Continuing operations | $ | 7.57 |  |  | $ | 4.47 |  |  | $ | 8.34 |  |  | $ | 4.53 |
Discontinued operations | $ | (0.02 | ) |  | $ | 0.34 |  |  | $ | 11.92 |  |  | $ | 0.65 |
Net income per common share - diluted | $ | 7.55 |  |  | $ | 4.81 |  |  | $ | 20.26 |  |  | $ | 5.18 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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