Commitments and Contingencies (Legal Contingencies) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2007 Tribune Company Litigation	Dec. 31, 2011 Esurance
Legal Contingency [Abstract]
Sales of unconsolidated affiliates, net of cash sold and held in escrow	$ 32.4	$ 24.8	$ 1,010.6
Gain (Loss) on Disposition of Business					700.0
Period for which company has indemnified Allstate for breaches of representations and warranties (in months)		18 months
Period for which the entity has agreed not to solicit certain employees of transferred subsidiaries (in years)		3 years
Percentage of positive or negative development in the loss reserves of the Transferred Subsidiaries retained	90.00%
Proceeds in connection with Tribune leveraged buyout				$ 39