Summary of Significant Accounting Policies Losses, Claims and Settlement Expenses - RFIG Run-off (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplementary Insurance Information, by Segment
Estimated reduction in ending reserve	$ 159.7	$ 147.1
RFIG Run-off Business [Member]
Supplementary Insurance Information, by Segment
Estimated reduction in beginning reserve	174.9	313.2	710.3
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Current year	80.5	111.7	223.1
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Prior year	71.9	12.2	(340.8)
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Sub-total	152.5	124.0	(117.6)
Estimated rescission reduction in settled claims	(212.2)	(262.3)	(279.5)
Estimated reduction in ending reserve	115.2	174.9	313.2
Pending or Threatened Litigation L [Member] | RFIG Run-off Business [Member]
Supplementary Insurance Information, by Segment
Estimated rescission reduction in settled claims	$ 26.6