Goodwill and Intangible Assets Goodwill and Intangible Assets, by Segment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-lived intangible assets	$ 176.7	$ 148.3
Indefinite-Lived Intangible Assets (Excluding Goodwill)	39.0	39.0
Agricultural Products [Member]
Finite-lived intangible assets	112.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)	35.2
Specialty Chemicals [Member]
Finite-lived intangible assets	55.1
Indefinite-Lived Intangible Assets (Excluding Goodwill)	3.2
Industrial Chemicals [Member]
Finite-lived intangible assets	9.4
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 0.6

Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant