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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Net Income Per Share |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Numerator (in millions): |  |  |  |  |  |  |
Net income (loss) | $ | (7.0) |  |  | $ | 22.8 |  |  | $ | 38.0 |  |  | $ | (13.7) |
Preferred stock dividends - undeclared and cumulative | 1.9 |  |  | 1.9 |  |  | 5.9 |  |  | 5.9 |
Net income (loss) allocable to common stockholders | $ | (8.9) |  |  | $ | 20.9 |  |  | $ | 32.1 |  |  | $ | (19.6) |
Denominator (in thousands): |  |  |  |  |  |  |
Average common shares outstanding - basic | 10,723 |  |  | 9,582 |  |  | 10,008 |  |  | 9,560 |
Potentially dilutive shares related to stock options and restricted stock units (a) | — |  |  | 44 |  |  | 274 |  |  | — |
Average common shares outstanding - diluted | 10,723 |  |  | 9,626 |  |  | 10,282 |  |  | 9,560 |
Net income (loss) per common share (in dollars): |  |  |  |  |  |  |
Basic | $ | (0.83) |  |  | $ | 2.18 |  |  | $ | 3.21 |  |  | $ | (2.05) |
Diluted | $ | (0.83) |  |  | $ | 2.17 |  |  | $ | 3.12 |  |  | $ | (2.05) |
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands) | 317 |  |  | — |  |  | — |  |  | 67 |
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands) | — |  |  | 460 |  |  | — |  |  | 460 |

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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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