Basis of Presentation and Accounting Policies (details)	9 Months Ended
Sep. 30, 2013 item
Basis of Presentation and Accounting Policies disclosure
Number of reportable business segments	3
Number of groups comprising Business Insurance Core	6
Percent of common stock owned, J. Malucelli - Brazilian joint venture	49.50%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant