Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation, Operating Activities

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the 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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Number of options outstanding, including both vested and non-vested options.

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Share-based Compensation - Share-based Plans Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 4.9	$ 10.6	$ 10.1
Tax benefit related to share-based compensation	1.3	$ 0.0
Share based compensation not yet recognized	$ 7.9
Recognition period for unrecognized share based compensation	2 years 146 days
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award
Excess tax deficiency from exercise of stock options			$ 1.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	790,000	1,220,000
Share based compensation not yet recognized	$ 1.9
Recognition period for unrecognized share based compensation	2 years 219 days
Performance units
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	40,000	50,000
Share based compensation not yet recognized	$ 0.3
Recognition period for unrecognized share based compensation	1 year 256 days
Restricted stock and RSU's
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	270,000	310,000
Share based compensation not yet recognized	$ 5.7
Recognition period for unrecognized share based compensation	2 years 146 days
2017 Omnibus Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (shares)	1,700,000
2017 Omnibus Equity Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	120,000
2017 Omnibus Equity Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	140,000
2017 Omnibus Equity Plan \| Performance units
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	10,000
2009 Omnibus Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (shares)	3,350,000
2009 Omnibus Equity Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	710,000
2009 Omnibus Equity Plan \| Performance units
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	30,000
2009 Omnibus Equity Plan \| Restricted stock and RSU's
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	130,000
2005 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (shares)	2,440,000