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Fair Value Measurements - Level 3 Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Equity securities
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Equity securities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Equity securities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Equity securities
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
U.S. corporate, state and municipalities
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
U.S. corporate, state and municipalities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
U.S. corporate, state and municipalities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
U.S. corporate, state and municipalities
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Foreign securities government
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Foreign securities government
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Foreign securities government
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Foreign securities government
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Residential mortgage-backed securities
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Residential mortgage-backed securities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Residential mortgage-backed securities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Residential mortgage-backed securities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Commercial mortgage-backed securities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Commercial mortgage-backed securities
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Other asset-backed securities
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Other asset-backed securities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Other asset-backed securities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Other asset-backed securities
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Fixed maturities, available-for-sale, including securities pledged
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Fixed maturities, available-for-sale, including securities pledged
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Fixed maturities, available-for-sale, including securities pledged
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Fixed maturities, available-for-sale, including securities pledged
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Fixed indexed annuities
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Fixed indexed annuities
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Fixed indexed annuities
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Fixed indexed annuities
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
GMAB/GMWB/GMWBL
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
GMAB/GMWB/GMWBL
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
GMAB/GMWB/GMWBL
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
GMAB/GMWB/GMWBL
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Stabilizer (Investment Only) and MCG Contracts
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Stabilizer (Investment Only) and MCG Contracts
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Stabilizer (Investment Only) and MCG Contracts
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Stabilizer (Investment Only) and MCG Contracts
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Assets held in separate accounts
Jun. 30, 2012
Level 3
Measured at fair value on a recurring basis
Assets held in separate accounts
Dec. 31, 2012
Level 3
Measured at fair value on a recurring basis
Assets held in separate accounts
Dec. 31, 2011
Level 3
Measured at fair value on a recurring basis
Assets held in separate accounts
Jun. 30, 2013
Level 3
Measured at fair value on a recurring basis
Derivatives Net Excluding Product Guaranteeand Fixed Indexed Annuity [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs Reconciliation Calculation [Roll Forward]                                                                                                    
Fair Value, Assets, beginning balance                       $ 524.2 $ 520.6 $ 520.6 $ 79.4 $ 104.2 $ 160.6 $ 160.6 $ 56.0 $ 74.1 $ 186.6 $ 186.6 $ 914.0 $ 0 $ 0.1 $ 115.2 $ 104.5 $ 104.5 $ 2,326.3 $ 817.7 $ 972.3 $ 972.3 $ 3,375.8                           $ 16.1 [1] $ 16.1 [1]    
Assets, Fair Value, beginning balance 2,931.2 2,860.3 2,860.3 2,255.3       55.8 67.6 67.6 82.9                                                                     16.3 [1] 16.1 [1] 16.1 [1] 22.3 [1]  
Total Realized/Unrealized Gains (Losses) Included in Net income 50.0 295.6 282.2 460.8       (2.2) 0 (0.5) 0 (0.3) 0.2 0.7 (0.3) 0 1.8 1.8 1.5 (3.8) (7.7) 4.0 (3.4) 0 0 8.8 7.2 15.6 (263.7) 4.7 1.5 22.1 (265.9)                         (0.1) [1] 0.3 [1] 0.3 [1] 0 [1]  
Total Realized/Unrealized Gains (Losses) Included in OCI               3.3 (0.7) (1.2) 1.3 (4.7) (7.0) (7.8) 6.0 5.7 (3.8) (12.4) (10.6) 0.2 6.1 5.7 (1.9) 0 0 (1.5) 0 4.3 178.0 (0.3) (4.7) (10.2) 171.5                         0 [1] 0 [1] 0 [1] 0 [1]  
Purchases 268.8 399.8 389.8 1,630.8       0.2 5.0 5.0 16.1 0.1 15.2 0.5 53.7 0 0 0 58.3 47.7 0 2.4 90.2 0 0 0 0 0 0.2 47.8 15.2 2.9 202.4                         21.3 [1] 1.1 [1] 16.3 [1] 9.8 [1]  
Issuances               0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0                         0 [1] 0 [1] 0 [1] 0 [1]  
Sales (262.3) (249.1) (601.1) (1,459.5)       0 (5.6) (8.3) (4.2) 0 (3.1) (3.1) 0 0 (11.5) (11.5) (39.0) (0.6) (7.2) (30.8) (23.4) 0 0 0 (1.5) (32.8) (721.1) (0.6) (23.3) (78.2) (783.5)                         (9.9) [1] (9.0) [1] (8.3) [1] (3.4) [1]  
Settlements               0 0 0 0 (26.3) (41.2) (93.1) (93.5) (11.2) (3.1) (28.8) (10.3) (0.7) (0.7) (1.2) (36.4) 0 (0.1) (28.8) (8.4) (3.2) (93.8) (67.0) (53.4) (126.3) (234.1)                         0 [1] 0 [1] 0 [1] 0 [1]  
Transfers in to Level 3               51.8 [2] 0 [2] 2.4 [2] 0 [2] 61.1 [2] 94.3 [2] 142.7 [2] 478.3 [2] 0 [2] 0 [2] 79.4 [2] 107.5 [2] 0 [2] 0 [2] 0.4 [2] 11.5 [2] 0 [2] 0 [2] 0.3 [2] 7.1 [2] 27.9 [2] 0 [2] 61.4 [2] 101.4 [2] 250.4 [2] 597.3 [2]                         2.2 [1],[2] 0.2 [1] 0 [1],[2] 0 [1],[2]  
Fair Value, Assets, ending balance                       465.2 535.2 524.2 520.6 98.7 59.1 104.2 160.6 116.9 84.3 74.1 186.6 0 0 93.6 107.9 115.2 104.5 774.4 786.5 817.7 972.3                           8.7 [1]   16.1 [1]  
Transfers out of Level 3               (49.9) [2] 0 [2] (9.2) [2] (28.5) [2] (88.9) [2] (43.8) [2] (36.3) [2] (3.0) [2] 0 [2] (84.9) [2] (84.9) [2] (2.8) [2] 0 [2] (92.8) [2] (93.0) [2] (764.0) [2] 0 [2] 0 [2] (0.4) [2] (1.0) [2] (1.1) [2] (1,321.4) [2] (89.3) [2] (222.5) [2] (215.3) [2] (2,091.2) [2]                         (9.9) [1],[2] 0 [1] (8.1) [1],[2] (12.6) [1],[2]  
Assets, Fair Value, ending balance 2,987.7 3,306.6 2,931.2 2,860.3       59.0 66.3 55.8 67.6                                                                     19.9 [1]   16.3 [1] 16.1 [1]  
Fair Value, Derivatives, ending balance         22.9 15.0 (24.8)                                                     (1,520.6) [3] (1,422.2) [3] (1,434.3) [3],[4] (1,304.9) [3],[4],[5] (1,340.8) [3] (2,501.7) [3] (2,035.4) [3],[4] (2,272.2) [3],[4],[5] (28.0) [3] (133.0) [3] (102.0) [3],[4] (221.0) [3],[4],[5]         56.5
Fair Value, Derivatives, beginning balance         (24.8) (24.8) 75.5                                                     (1,434.3) [3],[4] (1,304.9) [3],[4],[5] (1,304.9) [3],[4],[5] (1,178.2) [5] (2,035.4) [3],[4] (2,272.2) [3],[4],[5] (2,272.2) [3],[4],[5] (500.2) [5] (102.0) [3],[4] (221.0) [3],[4],[5] (221.0) [3],[4],[5] (3.0) [5]         22.9
Change In Unrealized Gains (Losses) Included in Earnings               (1.8) [6] (0.1) [6] (0.5) [7] 0 [7] (0.3) [6] (0.2) [6] 0.4 [7] (0.2) [7] 0 [6] 0 [6] 0 [7] (1.6) [7] (3.9) [6] (9.2) [6] (3.6) [7] (4.8) [7] 0 [7] 0 [7] 5.7 [6] 6.5 [6] 6.2 [7] (24.6) [7] 1.5 [6] (2.9) [6] 3.0 [7] (31.2) [7]                         (0.2) [1],[6]        
Total Realized/Unrealized Gains (Losses) Included in Net income         4.2 (9.4) (36.3)                                                     (84.2) [3] (133.2) [3] (177.5) [4] (114.1) [5] 766.9 [3] (154.0) [3] 390.3 [4] (1,618.5) [5] 77.1 [3] 90.8 [3] 124.5 [4] (212.5) [5]         53.2
Change In Unrealized Gains (Losses) Included in Earnings                                                                                             0.6 [1] 0.6 [1],[7] 0.1 [1],[7]  
Total Realized/Unrealized Gains (Losses) Included in OCI         0 0 0                                                     0 [3] 0 [3] 0 [4] 0 [5] 0 [3] 0 [3] 0 [4] 0 [5] 0 [3] 0 [3] 0 [4] 0 [5]         0
Purchases         23.9 12.6 0                                                     0 [3] 0 [3] 0 [4] 0 [5] 0 [3] 0 [3] 0 [4] 0 [5] (3.1) [3] (2.8) [3] (5.5) [4] (5.5) [5]         13.4
Issuances         0 0 (64.0)                                                     (35.9) [3] (66.6) [3] (94.5) [4] (135.4) [5] (72.6) [3] (75.7) [3] (154.1) [4] (155.6) [5] 0 [3] 0 [3] 0 [4] 0 [5]         0
Sales         0 0 0                                                     0 [3] 0 [3] 0 [4] 0 [5] 0 [3] 0 [3] 0 [4] 0 [5] 0 [3] 0 [3] 0 [4] 0 [5]         0
Settlements         25.0 42.0 0                                                     33.8 [3] 82.5 [3] 142.6 [4] 122.8 [5] 0.3 [3] 0.2 [3] 0.6 [4] 2.1 [5] 0 [3] 0 [3] 0 [4] 0 [5]         (33.0)
Transfers in to Level 3         0 [2] 0 [2] 0 [2]                                                     0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5] 0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5] 0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5]         0 [2]
Transfers out of Level 3         (5.4) [2] (5.4) [2] 0 [2]                                                     0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5] 0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5] 0 [2],[3] 0 [2],[3] 0 [2],[4] 0 [2],[5]         0 [2]
Fair Value, Derivatives, ending balance         22.9 15.0 (24.8)                                                     (1,520.6) [3] (1,422.2) [3] (1,434.3) [3],[4] (1,304.9) [3],[4],[5] (1,340.8) [3] (2,501.7) [3] (2,035.4) [3],[4] (2,272.2) [3],[4],[5] (28.0) [3] (133.0) [3] (102.0) [3],[4] (221.0) [3],[4],[5]         56.5
Change In Unrealized Gains (Losses) Included in Earnings         $ (2.6) [7] $ (6.1) [6] $ (53.7) [7]                                                     $ 0 [3],[6] $ 0 [3],[6] $ 0 [4],[7] $ 0 [5],[7] $ 0 [3],[6] $ 0 [3],[6] $ 0 [4],[7] $ 0 [5],[7] $ 0 [3],[6] $ 0 [3],[6] $ 0 [4],[7] $ 0 [5],[7]         $ 26.3 [6]
[1] The investment income and realized gains (losses) and change in unrealized gains (losses) included in net income for separate account assets are offset by an equal amount for separate account liabilities, which result in a net zero impact on net income for the Company.
[2] The Company's policy is to recognize transfers in and transfers out as of the beginning of the reporting period.
[3] All gains and losses on Level 3 liabilities are classified as realized gains (losses) for the purpose of this disclosure because it is impracticable to track realized and unrealized gains (losses) separately on a contract-by contract basis. These amounts are included in Other net realized gains (losses) in the Condensed Consolidated Statements of Operations.
[4] (losses) for the purpose of this disclosure because it is impracticable to track realized and unrealized gains (losses) separately on a contract-by contract basis. These amounts are included in Other net realized gains (losses) in the Consolidated Statements of Operations.
[5] All gains and losses on Level 3 liabilities are classified as realized gains (losses) for the purpose of this disclosure because it is impracticable to track realized and unrealized gains (losses) separately on a contract-by contract basis. These amounts are included in Other net realized gains (losses) in the Consolidated Statements of Operations.
[6] For financial instruments still held as of June 30, amounts are included in Net investment income and Total net realized capital gains (losses) in the Condensed Consolidated Statements of Operations.
[7] For financial instruments still held as of December 31, amounts are included in Net investment income and Total net realized capital gains (losses) in the Consolidated Statements of Operations.