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Share and Incentive-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 28, 2017 shares	Oct. 31, 2016 $ / Unit shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares
Successor
Share and Incentive Based Compensation Arrangement
Performance units vesting period		3 years
Performance units weighted average grant date fair value | $ / Unit		100
Successor | Restricted Stock
Share and Incentive Based Compensation Arrangement
Shares granted | shares		1,400,000			640,000
Vesting period					2 years 6 months
Share-based compensation expense			$ 6.8		$ 10.4
Share-based compensation, capitalized			0.8		1.3
Unrecognized compensation cost related to unvested awards			$ 28.9		$ 28.9
Unrecognized compensation cost, period of recognition					2 years 2 months 12 days
Value of shares granted (in usd per share) | $ / shares					$ 20.04
Accelerated vesting compensation cost					$ 1.8
Accelerated vesting (in shares) | shares					100,000
Successor | Performance Share Units
Share and Incentive Based Compensation Arrangement
Common stock issuable per performance share | shares			1		1
Successor | Performance Share Units | Maximum
Share and Incentive Based Compensation Arrangement
Shares granted | shares	400,000
Predecessor | Restricted Stock
Share and Incentive Based Compensation Arrangement
Shares granted | shares						0
Vesting period						4 years
Share-based compensation expense				$ 2.0		$ 9.4
Share-based compensation, capitalized				$ 0.5		$ 1.2
Value of shares granted (in usd per share) | $ / shares						$ 0
Accelerated vesting compensation cost						$ 5.4
Accelerated vesting (in shares) | shares						1,300,000

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion Ratio

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Topic 718
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 fair value at grant date for nonvested equity-based awards issued 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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