Investment Securities (Non-agency Mortgage-backed Securities) (Details) (Fair value, USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Investment securities
Fair value investments	$ 6,766,500,000	[1],[2],[3]	$ 6,950,700,000	[1],[2],[3],[4],[5],[6]	$ 7,500,800,000	[4],[5],[6]
Residential
Investment securities
Fair value investments	125,700,000		160,600,000
Commercial
Investment securities
Fair value investments	282,300,000		334,100,000
Total Non-agency
Investment securities
Fair value investments	408,000,000		494,700,000
Securities Issued in 2004 [Member] | Residential
Investment securities
Fair value investments	11,900,000
Securities Issued in 2004 [Member] | Commercial
Investment securities
Fair value investments	0
Securities Issued in 2004 [Member] | Total Non-agency
Investment securities
Fair value investments	11,900,000
2005 | Residential
Investment securities
Fair value investments	33,400,000
2005 | Commercial
Investment securities
Fair value investments	0
2005 | Total Non-agency
Investment securities
Fair value investments	33,400,000
2006 | Residential
Investment securities
Fair value investments	10,800,000
2006 | Commercial
Investment securities
Fair value investments	8,600,000
2006 | Total Non-agency
Investment securities
Fair value investments	19,400,000
2007 | Residential
Investment securities
Fair value investments	2,100,000
2007 | Commercial
Investment securities
Fair value investments	5,700,000
2007 | Total Non-agency
Investment securities
Fair value investments	7,800,000
2008 | Residential
Investment securities
Fair value investments	0
2008 | Commercial
Investment securities
Fair value investments	28,100,000
2008 | Total Non-agency
Investment securities
Fair value investments	28,100,000
2010 | Residential
Investment securities
Fair value investments	33,400,000
2010 | Commercial
Investment securities
Fair value investments	11,500,000
2010 | Total Non-agency
Investment securities
Fair value investments	44,900,000
2011 | Residential
Investment securities
Fair value investments	0
2011 | Commercial
Investment securities
Fair value investments	31,900,000
2011 | Total Non-agency
Investment securities
Fair value investments	31,900,000
2012 | Residential
Investment securities
Fair value investments	0
2012 | Commercial
Investment securities
Fair value investments	113,800,000
2012 | Total Non-agency
Investment securities
Fair value investments	113,800,000
Securities Issued in 2013 [Member] | Residential
Investment securities
Fair value investments	34,100,000
Securities Issued in 2013 [Member] | Commercial
Investment securities
Fair value investments	82,700,000
Securities Issued in 2013 [Member] | Total Non-agency
Investment securities
Fair value investments	$ 116,800,000

[1] Excludes carrying value of $26.6 and $35.0 at December 31, 2013 and January 1, 2013 associated with other long-term investments accounted for using the equity method and $(.1) at December 31, 2013 related to currency forward contracts.

[2] Excludes carrying value of $635.9 and $630.6 at December 31, 2013 and January 1, 2013 classified as short-term investments.

[3] Carrying value includes $236.3 and $338.1 at December 31, 2013 and January 1, 2013 that is classified as assets held for sale relating to discontinued operations.

[4] Carrying value includes $338.1 and $111.8 at December 31, 2012 and January 1, 2012 that is classified as assets held for sale relating to AutoOne discontinued operations.

[5] Excludes carrying value of $35.0 and $33.0 at December 31, 2012 and January 1, 2012 associated with other long-term investment limited partnerships accounted for using the equity method and $(.1) at December 31, 2012 related to currency forward contracts.

[6] Excludes carrying value of $630.6 and $846.0 at December 31, 2012 and January 1, 2012 classified as short-term investments.