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

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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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Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) employee_stock_plan $ / shares shares	Jun. 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)	2,500,000		2,500,000
Stock-based compensation expense (in USD) \| $	$ 4.2	$ 4.2	$ 8.2	$ 8.3
Stock-based compensation amortization expense unrecognized (in USD) \| $	$ 25.4		$ 25.4
Average remaining vesting period (in years)			2 years
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)	142,000	92,000	1,200,000	826,000
Award vesting rights as a percentage			33.33%
Award vesting period (in years)			3 years
Average grant date fair value (usd per share) \| $ / shares			$ 10.48	$ 10.40
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