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Basic and Diluted Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Calculation of Basic Income (Loss) Per Common Share to Diluted Income (Loss) Per Common Share | The following table presents a reconciliation of net income (loss) used in basic and diluted EPS calculations (in millions, except per share amounts):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Net income attributable to common stock and participating preferred stockholders |  | $ | 9.0 |  |  | $ | 54.7 |  |  | $ | 7.4 |  |  | $ | 19.0 |
Earnings allocable to common shares: |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per share |  |  |  |  |  |  |  |
Participating shares at end of period: |  |  |  |  |  |  |  |
Weighted-average common stock outstanding |  | 45.6 |  |  | 44.2 |  |  | 45.2 |  |  | 44.1 |
Unvested restricted stock |  | 0.6 |  |  | 0.4 |  |  | 0.5 |  |  | 0.3 |
Preferred stock (as-converted basis) |  | 2.1 |  |  | 4.8 |  |  | 2.2 |  |  | 4.8 |
Total |  | 48.3 |  |  | 49.4 |  |  | 47.9 |  |  | 49.2 |
Percentage of loss allocated to: |  |  |  |  |  |  |  |
Common stock |  | 94.5 | % |  | 89.5 | % |  | 94.4 | % |  | 89.6 | %
Unvested restricted stock |  | 1.2 | % |  | 0.8 | % |  | 1.0 | % |  | 0.6 | %
Preferred stock |  | 4.3 | % |  | 9.7 | % |  | 4.6 | % |  | 9.8 | %
Net Income attributable to common stock, basic |  | $ | 8.5 |  |  | $ | 48.9 |  |  | $ | 7.0 |  |  | $ | 17.0 |
Distributed and Undistributed earnings to Common Shareholders: |  |  |  |  |  |  |  |
Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments |  | (1.4 | ) |  | 0.1 |  |  | (2.4 | ) |  | — |
Net Income attributable to common stock, diluted |  | $ | 7.1 |  |  | $ | 49.0 |  |  | $ | 4.6 |  |  | $ | 17.0 |
Denominator for basic and dilutive earnings per share |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic |  | 45.6 |  |  | 44.2 |  |  | 45.2 |  |  | 44.1 |
Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments |  | 12.5 |  |  | 1.3 |  |  | 14.7 |  |  | 1.2 |
Weighted average common shares outstanding - diluted |  | 58.1 |  |  | 45.5 |  |  | 59.9 |  |  | 45.3 |
Net income attributable to participating security holders - Basic |  | $ | 0.19 |  |  | $ | 1.11 |  |  | $ | 0.15 |  |  | $ | 0.39 |
Net income attributable to participating security holders - Diluted |  | $ | 0.12 |  |  | $ | 1.08 |  |  | $ | 0.08 |  |  | $ | 0.38 |

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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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