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Fair Value Measurements - Fair Vaue Measurement (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets:    
Equity securities, available-for-sale $ 126.7 $ 142.8
Derivatives 430.5 512.7
Liabilities:    
Derivatives 306.3 346.8
Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 762.3 1,093.4
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 757.7 1,229.3
Assets held in separate accounts 52,786.4 47,916.5
Total assets, fair value 54,403.2 50,365.4
Liabilities:    
Total liabilities, fair value 6.4 0.7
Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 19,554.0 20,140.3
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 0 0
Assets held in separate accounts 5,216.0 5,722.5
Total assets, fair value 25,193.5 26,375.1
Liabilities:    
Total liabilities, fair value 254.1 346.1
Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 214.1 221.5
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 0 0
Assets held in separate accounts 19.9 16.3
Total assets, fair value 270.9 254.8
Liabilities:    
Total liabilities, fair value 49.1 122.4
Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 20,530.4 21,455.2
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 757.7 1,229.3
Assets held in separate accounts 58,022.3 53,655.3
Total assets, fair value 79,867.6 76,995.3
Liabilities:    
Total liabilities, fair value 309.6 469.2
Interest rate contracts | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Derivatives 7.0 0
Liabilities:    
Derivatives 6.4 0.7
Interest rate contracts | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Derivatives 415.4 508.3
Liabilities:    
Derivatives 287.6 327.8
Interest rate contracts | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Interest rate contracts | Measured at fair value on a recurring basis | Total
    
Assets:    
Derivatives 422.4 508.3
Liabilities:    
Derivatives 294.0 328.5
Foreign exchange contracts | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Foreign exchange contracts | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Derivatives 3.7 0.4
Liabilities:    
Derivatives 12.3 18.3
Foreign exchange contracts | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Foreign exchange contracts | Measured at fair value on a recurring basis | Total
    
Assets:    
Derivatives 3.7 0.4
Liabilities:    
Derivatives 12.3 18.3
Equity contract | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Derivatives 0 0.4
Equity contract | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Derivatives 0 0
Equity contract | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Equity contract | Measured at fair value on a recurring basis | Total
    
Assets:    
Derivatives 0 0.4
Credit contracts | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Derivatives 0 0
Credit contracts | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Derivatives 4.4 3.6
Credit contracts | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Derivatives 0 0
Credit contracts | Measured at fair value on a recurring basis | Total
    
Assets:    
Derivatives 4.4 3.6
Stabilizer and MCGs | Measured at fair value on a recurring basis | Level 1
    
Liabilities:    
Product guarantees 0 0
Stabilizer and MCGs | Measured at fair value on a recurring basis | Level 2
    
Liabilities:    
Product guarantees 0 0
Stabilizer and MCGs | Measured at fair value on a recurring basis | Level 3
    
Liabilities:    
Product guarantees 28.0 102.0
Stabilizer and MCGs | Measured at fair value on a recurring basis | Total
    
Liabilities:    
Product guarantees 28.0 102.0
FIA | Measured at fair value on a recurring basis | Level 1
    
Liabilities:    
Product guarantees 0 0
FIA | Measured at fair value on a recurring basis | Level 2
    
Liabilities:    
Product guarantees 0 0
FIA | Measured at fair value on a recurring basis | Level 3
    
Liabilities:    
Product guarantees 21.1 20.4
FIA | Measured at fair value on a recurring basis | Total
    
Liabilities:    
Product guarantees 21.1 20.4
Embedded derivative on reinsurance | Measured at fair value on a recurring basis | Level 1
    
Liabilities:    
Product guarantees 0 0
Embedded derivative on reinsurance | Measured at fair value on a recurring basis | Level 2
    
Liabilities:    
Product guarantees (45.8) 0
Embedded derivative on reinsurance | Measured at fair value on a recurring basis | Level 3
    
Liabilities:    
Product guarantees 0 0
Embedded derivative on reinsurance | Measured at fair value on a recurring basis | Total
    
Liabilities:    
Product guarantees (45.8) 0
Fixed maturities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 20,530.4 21,455.2
U.S. Treasuries
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 824.0 1,146.6
U.S. Treasuries | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 762.3 1,093.4
U.S. Treasuries | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 61.7 53.2
U.S. Treasuries | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. Treasuries | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 824.0 1,146.6
U.S. government agencies and authorities
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 386.7 397.0
U.S. government agencies and authorities | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. government agencies and authorities | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 386.7 397.0
U.S. government agencies and authorities | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. government agencies and authorities | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 386.7 397.0
U.S. corporate, state and municipalities | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
U.S. corporate, state and municipalities | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 10,375.5 10,512.8
U.S. corporate, state and municipalities | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 139.9 154.6
U.S. corporate, state and municipalities | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 10,515.4 10,667.4
Foreign
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 447.0 [1] 496.0 [1]
Foreign | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 [1] 0 [1]
Foreign | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,483.0 [1] 5,527.4 [1]
Foreign | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 18.7 [1] 24.6 [1]
Foreign | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 5,501.7 [1] 5,552.0 [1]
Residential mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,060.5 2,357.5
Residential mortgage-backed | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Residential mortgage-backed | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,029.7 2,348.4
Residential mortgage-backed | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 30.8 9.1
Residential mortgage-backed | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 2,060.5 2,357.5
Commercial mortgage-backed
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 745.2 839.1
Commercial mortgage-backed | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Commercial mortgage-backed | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 745.2 839.1
Commercial mortgage-backed | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Commercial mortgage-backed | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 745.2 839.1
Other asset-backed Securities | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 0 0
Other asset-backed Securities | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 472.2 462.4
Other asset-backed Securities | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 24.7 33.2
Other asset-backed Securities | Measured at fair value on a recurring basis | Total
    
Assets:    
Fixed maturities, including securities pledged, Fair Value 496.9 495.6
Equity securities
    
Assets:    
Equity securities, available-for-sale 126.7 142.8
Equity securities | Measured at fair value on a recurring basis | Level 1
    
Assets:    
Equity securities, available-for-sale 89.8 125.8
Equity securities | Measured at fair value on a recurring basis | Level 2
    
Assets:    
Equity securities, available-for-sale 0 0
Equity securities | Measured at fair value on a recurring basis | Level 3
    
Assets:    
Equity securities, available-for-sale 36.9 17.0
Equity securities | Measured at fair value on a recurring basis | Total
    
Assets:    
Equity securities, available-for-sale $ 126.7 $ 142.8
[1] Primarily U.S. dollar denominated.