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]	Exchange of Warrants [Member]	Exchange of Warrants [Member] Common Stock [Member]	Exchange of Warrants [Member] Additional Paid-in Capital [Member]	Exchange of Warrants [Member] Parent [Member]	United States Postretirement Benefit Plan of US Entity [Member]	United States Postretirement Benefit Plan of US Entity [Member] Common Stock [Member]	United States Postretirement Benefit Plan of US Entity [Member] Additional Paid-in Capital [Member]	United States Postretirement Benefit Plan of US Entity [Member] Parent [Member]	IPO [Member]	IPO [Member] Common Stock [Member]	IPO [Member] Additional Paid-in Capital [Member]	IPO [Member] Parent [Member]
Beginning balance, shares (in Shares) at Dec. 31, 2013		2,000,000	103,571,941
Beginning balance, stockholders' equity at Dec. 31, 2013	$ 1,115.1	$ 0.0	$ 0.0	$ 1,212.0	$ (194.2)	$ 1.3	$ 1,019.1	$ 96.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(5.9)				(7.4)		(7.4)	1.5
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	3.4		0.0	0.0	0.0	3.4	3.4	0.0
Issuance of common stock to former non-founder director for exercise of stock options		$ 0.0	$ 1.0	(1.0)
Issuance of stock, shares (in Shares)			3,959
Issuance of stock	0.0			0.0			0.0
Exercise of warrants for common shares (in shares)										14,992,950
Exercise of warrants for common shares									$ 172.5	$ 0.2	$ 172.3	$ 172.5
Issuance of common shares with 401 (k) (in shares)														1,670,386
Issuance of common shares with 401 (k)													$ 18.4	$ 0.0	$ 18.4	$ 18.4
Distribution to non-controlling interest	(0.2)							(0.2)
Ending balance, shares (in Shares) at Mar. 31, 2014		2,000,000	120,239,236
Ending balance, stockholders' equity at Mar. 31, 2014	1,303.3	$ 0.0	$ 1.2	1,401.7	(201.6)	4.7	1,206.0	97.3
Beginning balance, shares (in Shares) at Dec. 31, 2013		2,000,000	103,571,941
Beginning balance, stockholders' equity at Dec. 31, 2013	1,115.1	$ 0.0	$ 0.0	1,212.0	(194.2)	1.3	1,019.1	96.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	9.5
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	(37.3)
Ending balance, shares (in Shares) at Sep. 30, 2014		2,000,000	137,304,330
Ending balance, stockholders' equity at Sep. 30, 2014	$ 1,579.6	$ 0.0	$ 1.4	1,703.4	(190.1)	(33.5)	1,481.2	98.4
Price of shares issued (in usd per share)	$ 11.00								$ 11.50
Beginning balance, shares (in Shares) at Mar. 31, 2014		2,000,000	120,239,236
Beginning balance, stockholders' equity at Mar. 31, 2014	$ 1,303.3	$ 0.0	$ 1.2	1,401.7	(201.6)	4.7	1,206.0	97.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	1.5				(0.4)		(0.4)	1.9
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	19.7					18.4	18.4	1.3
Issuance of stock, shares (in Shares)			15,800,000
Issuance of stock	300.2		$ 0.2	300.0			300.2
Exercise of warrants for common shares (in shares)										1,251,744
Exercise of warrants for common shares	(13.4)			(13.4)	0.0	0.0	(13.4)	0.0	$ 14.4	$ 0.0	14.4	14.4
Recovery of short swing profits, net	0.5			0.5	0.0	0.0	0.5	0.0
Equity compensation expense	0.3			0.3	0.0	0.0	0.3	0.0
Distribution to non-controlling interest	(0.2)							(0.2)
Ending balance, shares (in Shares) at Jun. 30, 2014		2,000,000	137,290,980
Ending balance, stockholders' equity at Jun. 30, 2014	$ 1,626.3	$ 0.0	$ 1.4	1,703.5	(202.0)	23.1	1,526.0	100.3
Price of shares issued (in usd per share)	$ 19.00								$ 11.50
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ 13.9				11.9		11.9	2.0
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	(60.4)					(56.6)	(56.6)	(3.8)
Issuance of stock	(0.4)			(0.4)			(0.4)
Exercise of warrants for common shares (in shares)			9,242							4,108
Exercise of warrants for common shares									$ 0.1	$ 0.0	0.1	0.1
Equity compensation expense	0.2			0.2	0.0	0.0	0.2	0.0
Distribution to non-controlling interest	(0.1)							(0.1)
Ending balance, shares (in Shares) at Sep. 30, 2014		2,000,000	137,304,330
Ending balance, stockholders' equity at Sep. 30, 2014	1,579.6	$ 0.0	$ 1.4	1,703.4	(190.1)	(33.5)	1,481.2	98.4
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) income	(26.2)				(26.6)		(26.6)	0.4
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	(425.9)					(417.2)	(417.2)	(8.7)
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14			10,050,290
Issuance of common stock to former non-founder director for exercise of stock options		$ 0.0	$ 0.0	0.9
Issuance of common shares to directors for exercise of stock options, value	0.9						0.9	0.0
Issuance of common shares to directors for exercise of stock options (in shares)			75,000
Issuance of stock, shares (in Shares)			21,316
Issuance of stock	0.0			0.2			0.2	(0.2)
Exercise of warrants for common shares (in shares)										7,986
Exercise of warrants for common shares									0.1	$ 0.0	0.1	0.1
Issuance of common shares with 401 (k) (in shares)														0
Issuance of common shares with 401 (k)													0.7	$ 0.0	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	2,126.8	$ 0.0	$ 1.9	2,814.3	(250.7)	(547.8)	2,017.7	109.1
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) income	(157.1)
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	$ (625.1)
Issuance of common shares to directors for exercise of stock options (in shares)	75,000
Ending balance, shares (in Shares) at Sep. 30, 2015		2,000,000	210,879,597
Ending balance, stockholders' equity at Sep. 30, 2015	$ 2,268.3	$ 0.0	$ 2.1	3,287.3	(385.2)	(741.4)	2,162.8	105.5
Beginning balance, shares (in Shares) at Mar. 31, 2015		2,000,000	192,221,572
Beginning balance, stockholders' equity at Mar. 31, 2015	2,126.8	$ 0.0	$ 1.9	2,814.3	(250.7)	(547.8)	2,017.7	109.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(9.1)				(12.2)		(12.2)	3.1
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	161.8					160.2	160.2	1.6
Issuance of stock, shares (in Shares)			406,217															18,226,414
Issuance of stock	0.0			4.7			4.7	(4.7)									$ 483.0	$ 0.2	$ 482.8	$ 483.0
Exercise of warrants for common shares (in shares)										6,841
Exercise of warrants for common shares	(14.8)			(14.8)	0.0	0.0	(14.8)	0.0	0.3	$ 0.0	0.3	0.3
Issuance of common shares with 401 (k)													0.6		0.6	0.6
Ending balance, shares (in Shares) at Jun. 30, 2015		2,000,000	210,861,044
Ending balance, stockholders' equity at Jun. 30, 2015	$ 2,748.6	$ 0.0	$ 2.1	3,287.9	(262.9)	(387.6)	2,639.5	109.1
Price of shares issued (in usd per share)	$ 26.50
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ (121.8)				(122.3)		(122.3)	0.5
Issuance of common stock to Founder Entities as stock dividend to Series A Preferred Stock declared on 12/31/14	(361.0)					(353.8)	(353.8)	(7.2)
Issuance of common shares to directors for exercise of stock options (in shares)			2,500
Issuance of stock, shares (in Shares)			6,343
Exercise of warrants for common shares (in shares)										9,710
Exercise of warrants for common shares									$ 0.1	$ 0.0	$ 0.1	$ 0.1
Issuance of common shares with 401 (k)													$ (0.7)		$ (0.7)	$ (0.7)
Acquisition of non-controlling interest with Arysta Acquisition	6.4							6.4
Acquisition of remaining interest in Arysta Colombia	(3.3)							(3.3)
Ending balance, shares (in Shares) at Sep. 30, 2015		2,000,000	210,879,597
Ending balance, stockholders' equity at Sep. 30, 2015	$ 2,268.3	$ 0.0	$ 2.1	$ 3,287.3	$ (385.2)	$ (741.4)	$ 2,162.8	$ 105.5