Contingencies (Details) (USD $) In Millions	1 Months Ended	12 Months Ended	1 Months Ended	0 Months Ended
May 28, 2010 January 1992 Through July 2000	Dec. 31, 2003 January 1992 Through July 2000	Apr. 30, 2008 June 2006 Through November 2007	May 18, 2009 December 2008 Through November 2010
Legal settlement received		$ 15.3	$ 1.3
Additional legal settlement	$ 8.6			$ 2.9

Cash received for the settlement of litigation during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 27

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration