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Fair Value Measurements - Fair Value Measurement (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets:    
Equity securities, available-for-sale $ 127.0 $ 134.9
Derivatives 412.9 464.4
Liabilities:    
Derivatives 179.0 216.6
Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 626.9 618.8
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 727.0 529.7
Assets held in separate accounts 56,618.1 54,715.3
Total assets, fair value 58,061.9 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 20,314.1 19,852.4
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 35.0 0
Assets held in separate accounts 5,221.7 5,376.5
Total assets, fair value 25,983.6 25,693.3
Liabilities:    
Total liabilities, fair value 148.3 162.6
Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 268.9 234.6
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 0 0
Assets held in separate accounts 17.9 13.1
Total assets, fair value 324.0 283.6
Liabilities:    
Total liabilities, fair value 42.3 23.1
Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 21,209.9 20,705.8
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 762.0 529.7
Assets held in separate accounts 61,857.7 60,104.9
Total assets, fair value 84,369.5 81,939.7
Liabilities:    
Total liabilities, fair value 190.6 185.7
Reinsurance Agreements | Assets measured on recurring basis | Level 1
    
Liabilities:    
Derivatives 0 0
Reinsurance Agreements | Assets measured on recurring basis | Level 2
    
Liabilities:    
Derivatives (30.7) (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 (30.7) (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 398.2 448.6
Liabilities:    
Derivatives 172.4 206.4
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 398.2 448.6
Liabilities:    
Derivatives 172.4 206.4
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 7.2 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 7.2 7.7
Liabilities:    
Derivatives 6.6 10.2
Equity contract | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0.1 0
Equity contract | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 0  
Equity contract | Assets measured on recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Equity contract | Assets measured on recurring basis | Total
    
Assets:    
Derivatives 0.1 0
Credit contracts | Assets measured on recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Credit contracts | Assets measured on recurring basis | Level 2
    
Assets:    
Derivatives 7.4 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 7.4 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 18.0 0
Stabilizer and MCGs | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 18.0 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 24.3 23.1
FIA | Assets measured on recurring basis | Total
    
Liabilities:    
Product guarantees 24.3 23.1
Fixed maturities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 21,209.9 20,705.8
U.S. Treasuries
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 681.1 670.1
U.S. Treasuries | Assets measured on recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 626.9 618.8
U.S. Treasuries | Assets measured on recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 54.2 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 681.1 670.1
U.S. government agencies and authorities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 239.7 242.1
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 237.2 237.0
U.S. government agencies and authorities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2.5 5.1
U.S. government agencies and authorities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 239.7 242.1
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 10,934.0 10,605.9
U.S. corporate, state and municipalities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 183.4 145.3
U.S. corporate, state and municipalities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 11,117.4 10,751.2
Foreign
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 377.2 [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 5,855.2 [1] 5,727.8 [1]
Foreign | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 34.8 [1] 42.8 [1]
Foreign | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,890.0 [1] 5,770.6 [1]
Residential mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,096.3 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 2,073.2 2,076.0
Residential mortgage-backed | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 23.1 23.7
Residential mortgage-backed | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,096.3 2,099.7
Commercial mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 723.5 691.7
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 709.5 691.7
Commercial mortgage-backed | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 14.0 0
Commercial mortgage-backed | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 723.5 691.7
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 450.8 462.7
Other asset-backed Securities | Assets measured on recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 11.1 17.7
Other asset-backed Securities | Assets measured on recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 461.9 480.4
Equity securities
    
Assets:    
Equity securities, available-for-sale 127.0 134.9
Equity securities | Assets measured on recurring basis | Level 1
    
Assets:    
Equity securities, available-for-sale 89.8 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 $ 127.0 $ 134.9
[1] Primarily U.S. dollar denominated.