Acquisitions of Businesses (Details)					3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 13, 2015 USD ($)	Nov. 03, 2014 USD ($) agreement shares	Oct. 01, 2014 USD ($)	Oct. 01, 2014 EUR (€)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) product_line	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Transaction related costs						$ 24,100,000	$ 10,500,000	$ 55,400,000	$ 10,500,000
Capital lease obligations						4,500,000		4,500,000		$ 2,000,000
Asset retirement obligations						17,700,000	5,400,000	17,700,000	5,400,000	18,500,000	$ 17,400,000	$ 4,900,000	$ 4,800,000
Option reversal value						2,200,000	$ 500,000	(33,400,000)	$ 600,000
Goodwill acquired								2,200,000,000
Goodwill, expected to be tax deductible						185,000,000		185,000,000
Arysta [Member]
Business Acquisition [Line Items]
Total Consideration	$ 3,502,100,000
Cash, net	2,856,200,000
Common stock restricted shares (in shares)	600,000,000
Equity Instruments	645,900,000
Transaction related costs	$ 34,200,000					4,900,000		27,800,000
CAS [Member]
Business Acquisition [Line Items]
Total Consideration		$ 1,035,100,000
Cash, net		983,100,000
Equity Instruments		52,000,000
Transaction related costs		$ 43,700,000
Business acquisition, shares of common stock issued (in shares) | shares		2,000,000
Number of supply agreements | agreement		6
Capital lease obligations						13,200,000		13,200,000
Depreciation						2,200,000
Asset retirement obligations						13,200,000		$ 13,200,000
Minimum supply agreement term		4 years
Major product lines | product_line								7
Agriphar [Member]
Business Acquisition [Line Items]
Total Consideration			$ 370,300,000	€ 300,000,000
Cash, net			350,200,000
Common stock restricted shares (in shares) | €				€ 711,551
Equity Instruments			16,600,000
Transaction related costs			$ 5,000,000
Option reversal value								$ (3,000,000)
Agriphar Acquisition [Member]
Business Acquisition [Line Items]
First portion of restricted stock transfer								33.33%
Second portion of restricted stock transfer								33.33%
Third portion of restricted stock transfer								33.33%
OMG [Member]
Business Acquisition [Line Items]
Reverse termination fee						62,700,000		$ 62,700,000
Reimbursement of fees and expenses						7,500,000.0		7,500,000.0
Certis Europe BV [Member] | CAS [Member]
Business Acquisition [Line Items]
Percentage equity in acquisition		15.00%
Value of the equity interest		$ 15,000,000
Selling, General and Administrative Expenses [Member] | Arysta [Member]
Business Acquisition [Line Items]
Transaction related costs						4,900,000		27,800,000		6,400,000
Selling, General and Administrative Expenses [Member] | CAS [Member]
Business Acquisition [Line Items]
Transaction related costs						4,900,000		9,800,000		33,900,000
Selling, General and Administrative Expenses [Member] | Agriphar Acquisition [Member]
Business Acquisition [Line Items]
Transaction related costs						300,000		800,000		$ 4,200,000
Customer Lists [Member] | Arysta [Member]
Business Acquisition [Line Items]
Intangible asset useful life	20 years
Developed Technology Rights [Member] | Arysta [Member]
Business Acquisition [Line Items]
Intangible asset useful life	12 years
Cash [Member] | CAS [Member]
Business Acquisition [Line Items]
Total Consideration		$ 983,000,000
OMG [Member]
Business Acquisition [Line Items]
Reimbursement of fees and expenses						7,500,000.0		7,500,000.0
Apollo [Member]
Business Acquisition [Line Items]
Reimbursement of fees and expenses						$ 7,500,000.0		$ 7,500,000.0
Scenario, Forecast [Member] | OMG [Member]
Business Acquisition [Line Items]
Total Consideration					$ 367,000,000