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Investment Securities (Non-agency Commercial Mortgage-backed Securities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Commercial Mortgage Backed Securities Fixed Rate [Member] | Subordinate [Member]
       
Investment securities        
Fair value investments $ 4.5 [1]      
Commercial Mortgage Backed Securities Fixed Rate [Member] | Super Senior [Member]
       
Investment securities        
Fair value investments 253.0 [2]      
Commercial Mortgage Backed Securities Fixed Rate [Member] | Senior [Member]
       
Investment securities        
Fair value investments 109.6 [3]      
Commercial Mortgage Backed Securities Floating Rate [Member] | Subordinate [Member]
       
Investment securities        
Fair value investments 5.5 [1]      
Commercial Mortgage Backed Securities Floating Rate [Member] | Super Senior [Member]
       
Investment securities        
Fair value investments 15.3 [2]      
Commercial Mortgage Backed Securities Floating Rate [Member] | Senior [Member]
       
Investment securities        
Fair value investments 1.4 [3]      
Commercial Mortgage Backed Securities [Member] | Subordinate [Member]
       
Investment securities        
Fair value investments 10.0 [1]      
Commercial Mortgage Backed Securities [Member] | Super Senior [Member]
       
Investment securities        
Fair value investments 268.3 [2]      
Commercial Mortgage Backed Securities [Member] | Senior [Member]
       
Investment securities        
Fair value investments 111.0 [3]      
Fair Value
       
Investment securities        
Fair value investments 7,626.4 [4] 8,346.8 [4],[5] 7,265.9 [4] 7,901.6 [4]
Fair Value | Commercial Mortgage Backed Securities Fixed Rate [Member]
       
Investment securities        
Fair value investments 367.1      
Fair Value | Commercial Mortgage Backed Securities Floating Rate [Member]
       
Investment securities        
Fair value investments 22.2      
Fair Value | Commercial Mortgage Backed Securities [Member]
       
Investment securities        
Fair value investments $ 389.3 $ 276.7    
[1] (3) At issuance, Subordinate were not rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were junior to AAA or Aaa bonds.
[2] (1) At issuance, Super Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to other AAA or Aaa bonds.
[3] (2) At issuance, Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to non-AAA or non-Aaa bonds.
[4] (1) Excludes carrying value of $33.0 and $34.3 at January 1, 2012 and September 30, 2012 associated with other long-term investments accounted for using the equity method
[5] (2) Carrying value includes $111.8 and $377.3 at January 1, 2012 and September 30, 2012 that is classified as assets held for sale relating to discontinued operations. Level 3 Investments MillionsLevel 1InvestmentsLevel 2InvestmentsFixedMaturitiesCommonequitysecuritiesConvertiblefixedmaturitiesOther long-terminvestments Total Balance at January 1, 2011$1,894.4$5,477.4$128.4$71.2$—$330.2(1) $7,901.6(1) Total realized and unrealized gains (losses)(50.5)115.9(10.6)(4.9)—22.5 72.4 Foreign currency gains (losses) through OCI.3(84.4)(4.4)1.6—(5.0) (91.9) Amortization/Accretion2.4(40.7)(.1)——— (38.4) Purchases6,690.73,987.4212.819.7—27.9 10,938.5 Sales(6,782.1)(4,596.9)1.6(55.5)—(83.4) (11,516.3) Transfers in—111.81.0——— 112.8 Transfers out—(1.0)(111.8)——— (112.8) Balance at September 30, 2011$1,755.2$4,969.5$216.9$32.1$—$292.2(1) $7,265.9(1) (1) Excludes carrying value o