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Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Mortgage-Backed Securities [Member]
Dec. 31, 2013
Asset-Backed Securities [Member]
Dec. 31, 2013
Sub-Prime Mortgage-Backed And Asset-Backed Securities [Member]
Dec. 31, 2013
Alt A Mortgage Backed And Asset Backed Securities [Member]
Investment [Line Items]            
Available-for-sale securities     $ 2,755.5 $ 423.8 $ 32.2 $ 102.4
Available-for-sale Securities, Fair Value Disclosure 19,254.9 18,586.9        
Accumulated net unrealized gains         1.7 6.4
Carrying value of fixed maturity investments that did not produce income   1.8        
Future capital calls from various third-party investments 341.6          
Securities on deposit under regulatory requirements $ 449.9 $ 431.5