CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Total Stockholders' Equity	Non- controlling Interests
Balance (in shares) at Dec. 31, 2015		2,000,000	229,464,157		0
Balance at Dec. 31, 2015	$ 2,273.3	$ 0.0	$ 2.3	$ 3,520.4	$ 0.0	$ (532.7)	$ (886.1)	$ 2,103.9	$ 169.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(76.6)					(71.9)		(71.9)	(4.7)
Other comprehensive income, net of taxes	434.7						422.0	422.0	12.7
Issuance of common stock at $8.25 per share in the September 2016 Equity Offering (in shares)			48,787,878
Issuance of common stock at $8.25 per share in the September 2016 Equity Offering	402.5		$ 0.5	402.0				402.5
Issuance costs in connection with the September 2016 Equity Offering	(11.6)			(11.6)				(11.6)
Issuance of common stock to former non-founder director for exercise of stock options (in shares)			7,642
Conversion of PDH Common Stock into common stock (in shares)			63,944
Conversion of PDH Common Stock into common stock	0.0			0.7				0.7	(0.7)
Issuance of common stock under ESPP (in shares)			97,165
Issuance of common stock under ESPP	0.6			0.6				0.6
Equity compensation expense	5.3			5.3				5.3
Gain on extinguishment of Series B Convertible Preferred Stock	32.9					32.9		32.9
Changes in non-controlling interests	(0.8)			3.7				3.7	(4.5)
Balance (in shares) at Sep. 30, 2016		2,000,000	278,420,786		0
Balance at Sep. 30, 2016	3,060.3	$ 0.0	$ 2.8	3,921.1	$ 0.0	(571.7)	(464.1)	2,888.1	172.2
Balance (in shares) at Dec. 31, 2016		2,000,000	284,221,168		0
Balance at Dec. 31, 2016	2,889.8	$ 0.0	$ 2.8	3,981.3	$ 0.0	(573.5)	(674.5)	2,736.1	153.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(149.9)					(154.7)		(154.7)	4.8
Other comprehensive income, net of taxes	$ 270.3						264.5	264.5	5.8
Issuance of common stock to former non-founder director for exercise of stock options (in shares)	0
Exercise/vesting of share based compensation (in shares)			104,625		6,618
Exercise/ vesting of share based compensation	$ (0.1)				$ (0.1)			(0.1)
Conversion of PDH Common Stock into common stock (in shares)			2,674,205
Conversion of PDH Common Stock into common stock	0.0		$ 0.1	32.6				32.7	(32.7)
Issuance of common stock under ESPP (in shares)			100,949
Issuance of common stock under ESPP	0.9			0.9				0.9
Equity compensation expense	9.1			9.1				9.1
Changes in non-controlling interests	(1.2)			2.0				2.0	(3.2)
Balance (in shares) at Sep. 30, 2017		2,000,000	287,100,947		6,618
Balance at Sep. 30, 2017	$ 3,018.9	$ 0.0	$ 2.9	$ 4,025.9	$ (0.1)	$ (728.2)	$ (410.0)	$ 2,890.5	$ 128.4