Employee Compensation and Benefit Plans - Schedule of Stock Option Activity (Footnote) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, fair value (in dollars per share)	$ 2.63
Total intrinsic value of stock options exercised			$ 0.1
Stock options which expired unexercised	4,719,750
Market-based options that have not met performance criteria (in shares)	160,000
Average common stock trading price to determine market condition for options exercise	$ 38.94
Net aggregate intrinsic value of stock options outstanding	$ 0.0
Market-based options outstanding (in shares)	870,939
Market-based options outstanding, exercisable (in shares)	710,939
Weighted average remaining contractual term of options outstanding	5 years 8 days
Weighted average remaining contractual term of options exercisable	3 years 10 months 15 days
Total fair value of stock options vested and became exercisable	$ 0.6	$ 0.7	$ 1.1
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	266,990
Stock options granted, exercise price	$ 4.12

Required target average common stock trading price for stock option exercise.

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Number of Market-based Options Exercisable

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Number of Market-based Options Not Meeting Performance Criteria as of the balance sheet date.

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Number of Market-based Options Outstanding at balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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