Earnings per Common Share - Summary of Potential Common Stock Equivalents Excluded from Determination of Diluted Earnings Per Share (Details) - shares shares in Millions |
3 Months Ended | |||
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Mar. 31, 2018 |
Mar. 31, 2017 |
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Unvested Restricted Stock Awards [Member] | ||||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||||
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) | 1.6 | 1.3 | ||
Warrants to Purchase Common Stock [Member] | ||||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||||
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) | 0.1 | |||
Series A Preferred Stock [Member] | ||||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | ||||
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) | [1] | 46.5 | 46.5 | |
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