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Fair Value Measurements - Fair Value Measurement (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets:    
Equity securities, available-for-sale $ 123.1 $ 134.9
Derivatives 445.8 464.4
Liabilities:    
Derivatives 193.9 216.6
Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 715.1 618.8
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 670.0 529.7
Assets held in separate accounts 59,155.2 54,715.3
Total assets, fair value 60,626.2 55,962.8
Liabilities:    
Total liabilities, fair value 0 0
Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 20,371.8 19,852.4
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 0 0
Assets held in separate accounts 5,191.3 5,376.5
Total assets, fair value 26,008.9 25,693.3
Liabilities:    
Total liabilities, fair value 181.3 162.6
Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 440.6 234.6
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 0 0
Assets held in separate accounts 15.9 13.1
Total assets, fair value 493.7 283.6
Liabilities:    
Total liabilities, fair value 57.7 23.1
Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 21,527.5 20,705.8
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 670.0 529.7
Assets held in separate accounts 64,362.4 60,104.9
Total assets, fair value 87,128.8 81,939.7
Liabilities:    
Total liabilities, fair value 239.0 185.7
Reinsurance Agreements | Assets measured on recurring basis | Level 1
    
Liabilities:    
Derivatives 0 0
Reinsurance Agreements | Assets measured on recurring basis | Level 2
    
Liabilities:    
Derivatives (12.6) (54.0)
Reinsurance Agreements | Assets measured on recurring basis | Level 3
    
Liabilities:    
Derivatives 0 0
Reinsurance Agreements | Assets measured on recurring basis | Total
    
Liabilities:    
Derivatives (12.6) (54.0)
Interest rate contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Interest rate contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 431.9 448.6
Liabilities:    
Derivatives 187.3 206.4
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 431.9 448.6
Liabilities:    
Derivatives 187.3 206.4
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 6.4 7.7
Liabilities:    
Derivatives 6.6 10.2
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 6.4 7.7
Liabilities:    
Derivatives 6.6 10.2
Credit contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Credit contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 7.5 8.1
Credit contracts | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Credit contracts | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 7.5 8.1
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 0
Stabilizer and MCGs | Assets measured on recurring basis | Level 3
    
Liabilities:    
Product guarantees 32.0 0
Stabilizer and MCGs | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 32.0 0
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 25.7 23.1
FIA | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 25.7 23.1
Fixed maturities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 21,527.5 20,705.8
U.S. Treasuries
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 771.2 670.1
U.S. Treasuries | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 715.1 618.8
U.S. Treasuries | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 56.1 51.3
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 771.2 670.1
U.S. government agencies and authorities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 56.8 242.1
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 56.8 237.0
U.S. government agencies and authorities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 5.1
U.S. government agencies and authorities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 56.8 242.1
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 11,029.8 10,605.9
U.S. corporate, state and municipalities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 271.4 145.3
U.S. corporate, state and municipalities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 11,301.2 10,751.2
Foreign
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 386.1 [1] 431.6 [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 5,851.5 [1] 5,727.8 [1]
Foreign | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 145.6 [1] 42.8 [1]
Foreign | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,997.1 [1] 5,770.6 [1]
Residential mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,098.7 2,099.7
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 2,077.5 2,076.0
Residential mortgage-backed | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 21.2 23.7
Residential mortgage-backed | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,098.7 2,099.7
Commercial mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 826.4 691.7
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 826.4 691.7
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 826.4 691.7
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 473.7 462.7
Other asset-backed Securities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2.4 17.7
Other asset-backed Securities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 476.1 480.4
Equity securities
    
Assets:    
Equity securities, available-for-sale 123.1 134.9
Equity securities | Assets measured on recurring basis | Level 1
    
Assets:    
Equity securities, available-for-sale 85.9 99.0
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 37.2 35.9
Equity securities | Assets measured on recurring basis | Total
    
Assets:    
Equity securities, available-for-sale $ 123.1 $ 134.9
[1] Primarily U.S. dollar denominated.