Condensed Consolidated Statements of Changes in Stockholders' Equity Statement - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]
Beginning balance, shares (in Shares) at Dec. 31, 2014		2,000,000	182,066,980
Beginning balance, stockholders' equity at Dec. 31, 2014	$ 2,552.6	$ 0.0	$ 1.9	$ 2,812.4	$ (224.1)	$ (130.6)	$ 2,459.6	$ 93.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(26.3)				(26.7)		(26.7)	0.4
Other comprehensive loss, net of taxes	(353.1)					(344.4)	(344.4)	(8.7)
Issuance of common stock to Founder Entities as stock dividend on Series A Preferred Stock declared on 12/31/14 (in shares)			10,050,290
Issuance of common stock to former non-founder director for exercise of stock options (in shares)			75,000
Issuance of common stock to former non-founder director for exercise of stock options	0.9			0.9			0.9
Conversion of PDH Common Stock into common stock (in shares)			21,316
Conversion of PDH Common Stock into common stock				0.2			0.2	(0.2)
Issuance of common stock under ESPP (in shares)			7,986
Issuance of common stock under ESPP	0.1			0.1			0.1
Equity compensation expense	0.7			0.7			0.7
Acquisition of non-controlling interest with Arysta Acquisition	24.6							24.6
Ending balance, shares (in Shares) at Mar. 31, 2015		2,000,000	192,221,572
Ending balance, stockholders' equity at Mar. 31, 2015	2,199.5	$ 0.0	$ 1.9	2,814.3	(250.8)	(475.0)	2,090.4	109.1
Beginning balance, shares (in Shares) at Dec. 31, 2015		2,000,000	229,464,157
Beginning balance, stockholders' equity at Dec. 31, 2015	2,273.3	$ 0.0	$ 2.3	3,520.4	(532.7)	(886.1)	2,103.9	169.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(134.4)				(134.8)		(134.8)	0.4
Other comprehensive loss, net of taxes	$ 310.1					298.4	298.4	11.7
Issuance of common stock to former non-founder director for exercise of stock options (in shares)	0		7,642
Conversion of PDH Common Stock into common stock (in shares)			16,499
Conversion of PDH Common Stock into common stock				0.2			0.2	(0.2)
Issuance of common stock under ESPP (in shares)			35,399
Issuance of common stock under ESPP	$ 0.2			0.2			0.2
Equity compensation expense	0.9			0.9			0.9
Ending balance, shares (in Shares) at Mar. 31, 2016		2,000,000	229,523,697
Ending balance, stockholders' equity at Mar. 31, 2016	$ 2,450.1	$ 0.0	$ 2.3	$ 3,521.7	$ (667.5)	$ (587.7)	$ 2,268.8	$ 181.3