Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) employee_stock_plan $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of active employee stock plans \| employee_stock_plan	1
Number of shares available for grant (in shares)	2,500,000
Stock-based compensation expense (in USD) \| $	$ 4.0	$ 4.1
Stock-based compensation amortization expense unrecognized (in USD) \| $	$ 29.1
Average remaining vesting period (in years)	2 years 2 months 8 days
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)	1,000,000.0	734,000
Award vesting period (in years)	3 years
Award vesting rights as a percentage	33.33%
Average grant date fair value (usd per share) \| $ / shares	$ 10.79	$ 10.42
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)	589,000	532,000
Award vesting period (in years)	3 years
Average grant date fair value (usd per share) \| $ / shares	$ 10.82	$ 10.43

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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Number Of Active Employee Stock Plans

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