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

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Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) employee_stock_plan $ / shares shares	Sep. 30, 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)	3,100,000		3,100,000
Stock-based compensation expense (in USD) \| $	$ 4.1	$ 3.2	$ 12.3	$ 11.5
Stock-based compensation amortization expense unrecognized (in USD) \| $	$ 21.3		$ 21.3
Average remaining vesting period (in years)			1 year 10 months 2 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)	26,000	42,000	1,200,000	868,000
Award vesting rights as a percentage			33.33%
Award vesting period (in years)			3 years
Average grant date fair value (usd per share) \| $ / shares			$ 10.41	$ 10.43
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