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Share Based Compensation - Narrative (Details) $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2017 shares	Oct. 31, 2016 $ / Unit shares	Dec. 31, 2016 USD ($) shares	Oct. 01, 2016 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares				4,600,000
Successor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of employee incentive plan		3 years
Weighted average grant date fair value | $ / Unit		100
Liability related to performance units					$ 3.1
Compensation expense related to performance units					2.6
Capitalized compensation expense related to performance units					$ 0.4
Successor | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares		1,400,000	1,448,000		671,000
Vesting period (in years)		3 years			2 years 6 months
Share-based compensation expense			$ 6.6		$ 16.6
Share-based compensation, capitalized			0.3		2.0
Severance, compensation cost of accelerated shares			$ 4.3		$ 1.8
Severance, number of accelerated shares | shares			200,000		100,000
Unrecognized compensation cost related to unvested awards					$ 21.4
Period of recognition for unrecognized costs					1 year 9 months 18 days
Aggregate intrinsic value of restricted stock vested during period					$ 16.0
Successor | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					1.4
Share-based compensation, capitalized					$ 0.2
Performance share plan, conversion to common stock | shares	1
Predecessor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 11.2		$ 21.7
Share-based compensation, capitalized				1.7		$ 5.9
Unrecognized compensation cost related to unvested awards				$ 5.9
Predecessor | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares				0		2,928,000
Vesting period (in years)				4 years
Severance, compensation cost of accelerated shares				$ 5.4
Severance, number of accelerated shares | shares				1,300,000
Maximum | Successor | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	400,000

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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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