Significant Transactions (Sale of Esurance) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2011 Esurance	Dec. 31, 2011 Esurance
Significant Transactions
Gain (Loss) on Disposition of Business					$ 700.0
Gain (loss) on sale of discontinued operations, net of tax	$ 46.6	$ (91.0)	$ 658.3	$ 677.5

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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