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Share and Incentive-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2017 shares | Oct. 31, 2016 $ / Unit shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 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 |  |  |  |
Performance units compensation expense |  |  | $ 0.5 |  | $ 2.1 |
Performance units compensation, capitalized |  |  | 0.1 |  | 0.3 |
Performance units liability |  |  | 2.5 |  | $ 2.5 |
Successor | Restricted Stock |  |  |  |  |  |
Share and Incentive Based Compensation Arrangement |  |  |  |  |  |
Shares granted | shares |  | 1,400,000 |  |  | 640,000 |
Vesting period |  | 3 years |  |  | 2 years 6 months |
Share-based compensation expense |  |  | 3.1 |  | $ 13.5 |
Share-based compensation, capitalized |  |  | 0.5 |  | 1.8 |
Unrecognized compensation cost related to unvested awards |  |  | 25.0 |  | $ 25.0 |
Unrecognized compensation cost, period of recognition |  |  |  |  | 2 years |
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 |  |  |  |  |  |
Share-based compensation expense |  |  | 0.4 |  | $ 1.0 |
Share-based compensation, capitalized |  |  | $ 0.1 |  | $ 0.2 |
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 |  |  |  | $ 1.8 |  | $ 11.2
Share-based compensation, capitalized |  |  |  | $ 0.5 |  | $ 1.7
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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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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