Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended			6 Months Ended
	Apr. 01, 2017	Jun. 30, 2017	Apr. 01, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
EPS numerator:
Income (loss) from continuing operations, net of income taxes				$ (223.2)		$ (390.9)
Basic and diluted EPS attributable to common stockholders:
Loss from continuing operations (in dollars per share)				$ (12.30)		$ (21.47)
Net loss attributable to common stockholders (in dollars per share)				$ (12.46)		$ (21.82)
Successor
Earnings Per Share [Line Items]
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017)		0.1
EPS numerator:
Income (loss) from continuing operations, net of income taxes		$ 101.4
Less: Series A Convertible Preferred Stock dividends		115.1
Less: Net income attributable to noncontrolling interests		3.8
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities		(17.5)
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities		(2.7)
Net loss attributable to common stockholders, after allocation of earnings to participating securities		$ (20.2)
EPS denominator:
Weighted average shares outstanding — basic and diluted (in shares)		96.8
Basic and diluted EPS attributable to common stockholders:
Loss from continuing operations (in dollars per share)		$ (0.18)
Loss from discontinued operations (in dollars per share)		(0.03)
Net loss attributable to common stockholders (in dollars per share)		$ (0.21)
Predecessor
Earnings Per Share [Line Items]
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017)	0.2		0.2	0.4		0.4
EPS numerator:
Income (loss) from continuing operations, net of income taxes	$ (319.8)		$ (195.5)	$ (223.2)		$ (390.9)
Less: Series A Convertible Preferred Stock dividends	0.0		0.0	0.0		0.0
Less: Net income attributable to noncontrolling interests	0.0		4.8	1.7		1.7
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities	(319.8)		(200.3)	(224.9)		(392.6)
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities	(12.1)		(16.2)	(3.0)		(6.4)
Net loss attributable to common stockholders, after allocation of earnings to participating securities	$ (331.9)		$ (216.5)	$ (227.9)		$ (399.0)
EPS denominator:
Weighted average shares outstanding — basic and diluted (in shares)	18.3		18.3	18.3		18.3
Basic and diluted EPS attributable to common stockholders:
Loss from continuing operations (in dollars per share)	$ (17.44)		$ (10.93)	$ (12.30)		$ (21.47)
Loss from discontinued operations (in dollars per share)	(0.66)		(0.88)	(0.16)		(0.35)
Net loss attributable to common stockholders (in dollars per share)	$ (18.10)		$ (11.81)	$ (12.46)		$ (21.82)
Preferred Stock
Basic and diluted EPS attributable to common stockholders:
Conversion of stock, shares converted					11.7
Warrant
Basic and diluted EPS attributable to common stockholders:
Warrants unexercised, percent (less than 0.1%)		0.10%			0.10%
Common Stock
Basic and diluted EPS attributable to common stockholders:
Conversion of stock, shares issued					29.2