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

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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, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) employee_stock_plan $ / shares shares	Sep. 30, 2018 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)	4,300,000		4,300,000
Stock-based compensation expense (in USD) \| $	$ 3.2	$ 3.7	$ 11.5	$ 15.8
Stock-based compensation amortization expense unrecognized (in USD) \| $	$ 18.9		$ 18.9
Average remaining vesting period (in years)			2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)			0	1,200,000
Award vesting period (in years)			3 years
Award vesting rights as a percentage			33.33%
Average grant date fair value (usd per share) \| $ / shares				$ 11.88
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)			868,000	0
Award vesting period (in years)			3 years
Award vesting rights as a percentage			33.33%
Average grant date fair value (usd per share) \| $ / shares			$ 10.43
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)			532,000	446,000
Award vesting period (in years)			3 years
Average grant date fair value (usd per share) \| $ / shares			$ 10.43	$ 12.35