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Equity - Stock-Based Compensation (Narrative) (Details) - USD ($)	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jun. 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance (in shares)	7,080,000
Allocated share-based compensation expense	$ 0	$ 2,000,000	$ 9,000,000	$ 7,000,000
Tax benefit from compensation expense			$ 0	$ 1,500,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Unrecognized compensation costs			$ 8,000,000
Unrecognized compensation cost, weighted average period of recognition			2 years
Performance-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs			$ 5,000,000
Unrecognized compensation cost, weighted average period of recognition			2 years
Restated Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance (in shares)					10,000,000
Number of shares available for grant (in shares)			6,954,454
Minimum | Performance-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years
Vesting rights percentage			0.00%
Maximum | Performance-based Restricted Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Vesting rights percentage			200.00%

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

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