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Stockholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Comprehensive Income (Loss) Pre-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax $ (1,405.2) $ 292.9 $ (1,537.5) $ 626.0
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax 24.3 29.6 58.4 40.1
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax 168.1 (24.1) 211.8 (79.6)
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, pre-tax 543.5 (150.6) 451.6 (202.6)
Net unrealized gains (losses) on available-for-sale securities, pre-tax (669.3) 147.8 (815.7) 383.9
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax 2.1 (17.1) (18.1) (22.0)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (1.1) 1.7 0.1 5.5
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (0.4)   1.0  
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 0.6 (15.4) (17.0) (16.5)
Net unrealized gains (losses) on derivative instruments during the period, pre-tax (18.6) 73.3 14.0 29.5
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax 0.2 1.0 (0.3) 10.7
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax 5.4 1.1 6.4 29.9
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, pre-tax 12.6   12.6  
Net unrealized gains (losses) on derivative instruments, pre-tax (0.4) 75.4 32.7 70.1
Foreign currency translation adjustment, pre-tax (200.4) (96.2) (145.3) (40.5)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 21.3 13.5 42.5 26.9
Net unrecognized postretirement benefit obligation, pre-tax 21.3 13.5 42.5 26.9
Other comprehensive income (loss), pre-tax (848.2) 125.1 (902.8) 423.9
Other Comprehensive Income (Loss) Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, tax 445.5 (83.2) 491.5 (195.4)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax (8.1) (10.1) (19.8) (14.0)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax (58.8) 8.4 (74.1) 27.8
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, tax (163.0) 37.8 (134.9) 59.7
Net unrealized gains (losses) on available-for-sale securities, tax 215.6 (47.1) 262.7 (121.9)
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax (0.3) 6.1 6.8 7.7
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax 0.2 (0.6)   (2.0)
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax 0.2   (0.4)  
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax 0.1 5.5 6.4 5.7
Net unrealized gains (losses) on derivative instruments during the period, tax 6.6 (25.6) (4.2) (10.3)
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax (0.1) (0.5)   (3.9)
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax (1.8) (0.4) (2.2) (10.5)
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, tax (4.6)   (4.6)  
Net unrealized gains (losses) on derivative instruments, tax 0.1 (26.5) (11.0) (24.7)
Foreign currency translation adjustment, tax 10.0 12.7 9.3 16.6
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (7.5) (4.7) (14.9) (9.4)
Net unrecognized postretirement benefit obligation, tax (7.5) (4.7) (14.9) (9.4)
Other comprehensive income (loss), tax 218.3 (60.1) 252.5 (133.7)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period (959.7) 209.7 (1,046.0) 430.6
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income 16.2 19.5 38.6 26.1
Adjustments for assumed changes in amortization patterns related to available-for-sale securities 109.3 (15.7) 137.7 (51.8)
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities 380.5 (112.8) 316.7 (142.9)
Net unrealized gains (losses) on available-for-sale securities (453.7) 100.7 (553.0) 262.0
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period 1.8 (11.0) (11.3) (14.3)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale (0.9) 1.1 0.1 3.5
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale (0.2)   0.6  
Noncredit component of impairment losses on fixed maturities, available-for-sale 0.7 (9.9) (10.6) (10.8)
Net unrealized gains (losses) on derivative instruments during the period (12.0) 47.7 9.8 19.2
Reclassification adjustment for (gains) losses on derivative instruments included in net income 0.1 0.5 (0.3) 6.8
Adjustments for assumed changes in amortization patterns related to derivative instruments 3.6 0.7 4.2 19.4
Adjustments for assumed changes in policyholder liabilities related to derivative instruments 8.0   8.0  
Net unrealized gains (losses) on derivative instruments (0.3) 48.9 21.7 45.4
Foreign currency translation adjustment (190.4) (83.5) (136.0) (23.9)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 13.8 8.8 27.6 17.5
Net unrecognized postretirement benefit obligation 13.8 8.8 27.6 17.5
Other comprehensive income (loss) $ (629.9) $ 65.0 $ (650.3) $ 290.2