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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Net Income Per Share |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Numerator (in millions): |  |  |  |  |  |  |
Net income (loss) | $ | 33.7 |  |  | $ | (15.6 | ) |  | $ | 45.0 |  |  | $ | (36.5 | )
Preferred stock dividends - undeclared and cumulative | 2.0 |  |  | 2.0 |  |  | 4.0 |  |  | 4.0 |
Net income (loss) allocable to common stockholders | $ | 31.7 |  |  | $ | (17.6 | ) |  | $ | 41.0 |  |  | $ | (40.5 | )
Denominator (in thousands): |  |  |  |  |  |  |
Average common shares outstanding - basic | 9,675 |  |  | 9,565 |  |  | 9,647 |  |  | 9,549 |
Potentially dilutive shares related to stock options and restricted stock units (a) | 252 |  |  | — |  |  | 235 |  |  | — |
Average common shares outstanding - diluted | 9,927 |  |  | 9,565 |  |  | 9,882 |  |  | 9,549 |
Net income (loss) per common share (in dollars): |  |  |  |  |  |  |  |  |
Basic | $ | 3.28 |  |  | $ | (1.84 | ) |  | $ | 4.25 |  |  | $ | (4.24 | )
Diluted | $ | 3.19 |  |  | $ | (1.84 | ) |  | $ | 4.15 |  |  | $ | (4.24 | )
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands) | — |  |  | 77 |  |  | — |  |  | 80 |
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands) | — |  |  | 360 |  |  | — |  |  | 360 |

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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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