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Fair Value Measurements Fair Vaue Measurement (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Assets:    
Equity securities, available-for-sale $ 134,900,000 $ 142,800,000
Derivatives 464,400,000 512,700,000
Liabilities:    
Derivatives 216,600,000 346,800,000
Fixed maturities valued using unadjusted broker quotes 190,500,000 175,500,000
Fixed maturities valued using unadjusted prices 15,900,000,000 16,700,000,000
Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 618,800,000 1,093,400,000
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 529,700,000 1,229,300,000
Assets held in separate accounts 54,715,300,000 47,916,500,000
Total assets, fair value 55,962,800,000 50,365,400,000
Liabilities:    
Total liabilities, fair value 0 700,000
Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 19,852,400,000 20,140,300,000
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 0 0
Assets held in separate accounts 5,376,500,000 5,722,500,000
Total assets, fair value 25,693,300,000 26,375,100,000
Liabilities:    
Total liabilities, fair value 162,600,000 346,100,000
Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 234,600,000 221,500,000
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 0 0
Assets held in separate accounts 13,100,000 16,300,000
Total assets, fair value 283,600,000 254,800,000
Liabilities:    
Total liabilities, fair value 23,100,000 122,400,000
Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 20,705,800,000 21,455,200,000
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 529,700,000 1,229,300,000
Assets held in separate accounts 60,104,900,000 53,655,300,000
Total assets, fair value 81,939,700,000 76,995,300,000
Liabilities:    
Total liabilities, fair value 185,700,000 469,200,000
Interest rate contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 700,000
Interest rate contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 448,600,000 508,300,000
Liabilities:    
Derivatives 206,400,000 327,800,000
Interest rate contracts | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Interest rate contracts | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 448,600,000 508,300,000
Liabilities:    
Derivatives 206,400,000 328,500,000
Foreign exchange contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Foreign exchange contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 7,700,000 400,000
Liabilities:    
Derivatives 10,200,000 18,300,000
Foreign exchange contracts | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Foreign exchange contracts | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 7,700,000 400,000
Liabilities:    
Derivatives 10,200,000 18,300,000
Equity contract | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 400,000
Equity contract | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 0 0
Equity contract | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Equity contract | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 0 400,000
Credit contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Credit contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 8,100,000 3,600,000
Credit contracts | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Credit contracts | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 8,100,000 3,600,000
Stabilizer and MCGs | Assets measured on recurring basis | Level 1
    
Liabilities:    
Product guarantees 0 0
Stabilizer and MCGs | Assets measured on recurring basis | Level 2
    
Liabilities:    
Product guarantees   0
Stabilizer and MCGs | Assets measured on recurring basis | Level 3
    
Liabilities:    
Product guarantees 0 102,000,000
Stabilizer and MCGs | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 0 102,000,000
FIA | Assets measured on recurring basis | Level 1
    
Liabilities:    
Product guarantees 0 0
FIA | Assets measured on recurring basis | Level 2
    
Liabilities:    
Product guarantees 0 0
FIA | Assets measured on recurring basis | Level 3
    
Liabilities:    
Product guarantees 23,100,000 20,400,000
FIA | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 23,100,000 20,400,000
Fixed maturities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 20,705,800,000 21,455,200,000
U.S. Treasuries
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 670,100,000 1,146,600,000
U.S. Treasuries | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 618,800,000 1,093,400,000
U.S. Treasuries | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 51,300,000 53,200,000
U.S. Treasuries | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. Treasuries | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 670,100,000 1,146,600,000
U.S. government agencies and authorities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 242,100,000 397,000,000
U.S. government agencies and authorities | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. government agencies and authorities | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 237,000,000 397,000,000
U.S. government agencies and authorities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,100,000 0
U.S. government agencies and authorities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 242,100,000 397,000,000
U.S. corporate, state and municipalities | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. corporate, state and municipalities | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 10,605,900,000 10,512,800,000
U.S. corporate, state and municipalities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 145,300,000 154,600,000
U.S. corporate, state and municipalities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 10,751,200,000 10,667,400,000
Foreign
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 431,600,000 [1] 496,000,000 [1]
Foreign | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 [1] 0 [1]
Foreign | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,727,800,000 [1] 5,527,400,000 [1]
Foreign | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 42,800,000 [1] 24,600,000 [1]
Foreign | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,770,600,000 [1] 5,552,000,000 [1]
Residential mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,099,700,000 2,357,500,000
Residential mortgage-backed | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Residential mortgage-backed | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,076,000,000 2,348,400,000
Residential mortgage-backed | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 23,700,000 9,100,000
Residential mortgage-backed | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,099,700,000 2,357,500,000
Commercial mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 691,700,000 839,100,000
Commercial mortgage-backed | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Commercial mortgage-backed | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 691,700,000 839,100,000
Commercial mortgage-backed | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Commercial mortgage-backed | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 691,700,000 839,100,000
Other asset-backed Securities | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Other asset-backed Securities | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 462,700,000 462,400,000
Other asset-backed Securities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 17,700,000 33,200,000
Other asset-backed Securities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 480,400,000 495,600,000
Equity securities
    
Assets:    
Equity securities, available-for-sale 134,900,000 142,800,000
Equity securities | Assets measured on recurring basis | Level 1
    
Assets:    
Equity securities, available-for-sale 99,000,000 125,800,000
Equity securities | Assets measured on recurring basis | Level 2
    
Assets:    
Equity securities, available-for-sale 0 0
Equity securities | Assets measured on recurring basis | Level 3
    
Assets:    
Equity securities, available-for-sale 35,900,000 17,000,000
Equity securities | Assets measured on recurring basis | Total
    
Assets:    
Equity securities, available-for-sale 134,900,000 142,800,000
Embedded derivative on reinsurance | Assets measured on recurring basis | Level 1
    
Liabilities:    
Derivatives 0 0
Embedded derivative on reinsurance | Assets measured on recurring basis | Level 2
    
Liabilities:    
Derivatives (54,000,000) 0
Embedded derivative on reinsurance | Assets measured on recurring basis | Level 3
    
Liabilities:    
Derivatives 0 0
Embedded derivative on reinsurance | Assets measured on recurring basis | Total
    
Liabilities:    
Derivatives $ (54,000,000) $ 0
[1] Primarily U.S. dollar denominated.