Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Compensation (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Compensation Plans (Textuals)
Maximum number of common stock shares authorized for issuance under Plan	61,400,000
Shares available for future awards	13,600,000
Number of awards exercised	0
Stock Appreciation Rights (SARs)
Stock Compensation Plans (Textuals)
Award vesting period	3 years
SARs expiration period	7 years
Total compensation cost to be recognized in future periods	$ 0.0
Number of awards exercised	0	0	0
Restricted Stock
Stock Compensation Plans (Textuals)
Award vesting period	3 years
Total compensation cost to be recognized in future periods	$ 17.4
Weighted average period over which remaining cost will be recognized	2 years
Performance-based equity awards
Stock Compensation Plans (Textuals)
Total compensation cost to be recognized in future periods	$ 5.7
Weighted average period over which remaining cost will be recognized	1 year 10 months 24 days
Performance-based equity awards \| Minimum
Stock Compensation Plans (Textuals)
Award vesting period	1 year 3 months
Payout percentage	0.00%
Performance-based equity awards \| Maximum
Stock Compensation Plans (Textuals)
Award vesting period	3 years 3 months
Payout percentage	200.00%