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Stock-Based Compensation - Other Equity Award (Details) - Restricted Stock Awards - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 1.4	$ 1.0	$ 1.0	$ 1.0
RSA 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awarded							$ 0.5
Share-based compensation expense		$ (1.0)		$ 0.4	$ 0.3	$ 0.1
RSA 2012 | Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock upon vesting	$ 2.0

X

- Definition

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.

+ References

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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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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

No definition available.

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- Definition

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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