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Investments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fixed maturities
   
Available-for-sale securities disclosures    
Amortized cost $ 47,715.3 $ 47,370.8
Gross unrealized gains 4,095.1 3,159.9
Gross unrealized losses 871.1 1,524.0
Fair value 50,939.3 49,006.7
Other-than-temporary impairments in AOCI 302.0 284.7
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 95.0 28.9
U.S. government and agencies
   
Available-for-sale securities disclosures    
Amortized cost 911.4 772.3
Gross unrealized gains 33.2 32.8
Gross unrealized losses 0.3  
Fair value 944.3 805.1
Non-U.S. governments
   
Available-for-sale securities disclosures    
Amortized cost 944.9 917.6
Gross unrealized gains 264.3 180.5
Gross unrealized losses 0.9 1.4
Fair value 1,208.3 1,096.7
States and political subdivisions
   
Available-for-sale securities disclosures    
Amortized cost 2,940.4 2,670.0
Gross unrealized gains 241.1 218.2
Gross unrealized losses 2.7 5.5
Fair value 3,178.8 2,882.7
Corporate debt securities
   
Available-for-sale securities disclosures    
Amortized cost 31,615.4 31,954.2
Gross unrealized gains 3,029.9 2,321.3
Gross unrealized losses 319.9 719.0
Fair value 34,325.4 33,556.5
Other-than-temporary impairments in AOCI 19.5 19.5
Residential mortgage-backed pass-through securities
   
Available-for-sale securities disclosures    
Amortized cost 3,022.7 3,155.8
Gross unrealized gains 204.4 187.9
Gross unrealized losses 0.4 0.7
Fair value 3,226.7 3,343.0
Commercial mortgage-backed securities
   
Available-for-sale securities disclosures    
Amortized cost 4,094.8 3,894.3
Gross unrealized gains 241.7 117.0
Gross unrealized losses 439.1 597.6
Fair value 3,897.4 3,413.7
Other-than-temporary impairments in AOCI 195.4 168.2
Collateralized debt obligations
   
Available-for-sale securities disclosures    
Amortized cost 428.8 399.7
Gross unrealized gains 7.0 1.9
Gross unrealized losses 56.6 62.8
Fair value 379.2 338.8
Other-than-temporary impairments in AOCI 4.3 7.0
Other debt obligations
   
Available-for-sale securities disclosures    
Amortized cost 3,756.9 3,606.9
Gross unrealized gains 73.5 100.3
Gross unrealized losses 51.2 137.0
Fair value 3,779.2 3,570.2
Other-than-temporary impairments in AOCI 82.8 90.0
Equity securities
   
Available-for-sale securities disclosures    
Amortized cost 132.4 75.2
Gross unrealized gains 12.6 8.4
Gross unrealized losses 8.5 6.5
Fair value $ 136.5 $ 77.1