Performance Stock Units, Reserved In Case Actual Results Exceed Target Levels

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Performance Stock Units, Shares Reserved for Future Issuance

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RSUs Vested Not Yet Released

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Share-based Compensation, Number of Stock Plans

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Aggregate number of common shares reserved for future issuance.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 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-Based Compensation (Details) $ in Millions	12 Months Ended
Stock-Based Compensation (Details) $ in Millions	Dec. 31, 2019 USD ($) plan shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	May 31, 2017 shares
Stock-based compensation additional disclosures
Number of stock plans \| plan	3
Compensation Not yet Recognized, Stock Options \| $	$ 19.8
2008 Plan
Stock-based compensation additional disclosures
Shares available for grant	0
2017 Omnibus Incentive Plan
Stock-based compensation additional disclosures
Shares reserved for issuance				3,000,000
Shares available for grant	1,952,041
Stock Options
Stock-based compensation additional disclosures
Vesting Period	4 years
Weighted average remaining period over which unrecognized amounts are expected to be recognized	3 years
Stock Options \| Maximum
Stock-based compensation additional disclosures
Expiration Period	10 years
Performance Stock Units
Stock-based compensation additional disclosures
Granted	34,088	88,345	0
Performance Stock Units, Shares Reserved for Future Issuance	34,088
Performance Stock Units, Reserved In Case Actual Results Exceed Target Levels	90,020
Restricted stock units
Stock-based compensation additional disclosures
Vesting Period	3 years
Weighted average remaining period over which unrecognized amounts are expected to be recognized	2 years
Compensation Not yet Recognized, RSUs and PSUs \| $	$ 7.8
RSUs Vested Not Yet Released	588,359
Granted	109,998	128,860	117,614