Equity Method Investee (Details) (Blue Flint, USD $) In Millions, unless otherwise specified	1 Months Ended
Jan. 31, 2012	Dec. 31, 2011
Blue Flint
Equity Method Investee
Proceeds from sale of interest in equity method investee	$ 18.5
Equity earnings in Blue Flint since investment	15.0
Non-cash gain (loss) related to sale of interest in equity method investee		$ (6.3)

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 35

-URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32847-111569

Name:	us-gaap_EquityMethodInvestmentNetSalesProceeds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration