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Stockholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Other Comprehensive Income (Loss) Pre-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax $ 292.9 $ 265.8 $ 626.0 $ 546.9
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax 29.6 27.3 40.1 27.1
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax (24.1) (73.1) (79.6) (120.2)
Adjustments for assumed changes in policyholder liabilities, pre-tax (150.6) 12.8 (202.6) 38.5
Net unrealized gains (losses) on available-for-sale securities, pre-tax 147.8 232.8 383.9 492.3
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax (17.1) 9.7 (22.0) 48.1
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 1.7 1.3 5.5 (6.5)
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (15.4) 11.0 (16.5) 41.6
Net unrealized gains (losses) on derivative instruments during the period, pre-tax 73.3 (15.6) 29.5 (33.0)
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax 1.0 6.2 10.7 15.0
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax 1.1 (3.1) 29.9 (1.2)
Net unrealized gains (losses) on derivative instruments, pre-tax 75.4 (12.5) 70.1 (19.2)
Foreign currency translation adjustment, pre-tax (99.4) 65.5 (38.0) 92.5
Unrecognized postretirement benefit obligation during the period, pre-tax   (35.2)   36.1
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 13.5 1.4 26.9 5.8
Net unrecognized postretirement benefit obligation, pre-tax 13.5 (33.8) 26.9 41.9
Other comprehensive income (loss), pre-tax 121.9 263.0 426.4 649.1
Other Comprehensive Income (Loss) Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, tax (83.2) (103.5) (195.4) (204.2)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax (10.1) (8.2) (14.0) (8.1)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax 8.4 25.6 27.8 42.1
Adjustments for assumed changes in policyholder liabilities, tax 37.8   59.7  
Net unrealized gains (losses) on available-for-sale securities, tax (47.1) (86.1) (121.9) (170.2)
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax 6.1 (1.6) 7.7 (17.6)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax (0.6) (0.4) (2.0) 2.3
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax 5.5 (2.0) 5.7 (15.3)
Net unrealized gains (losses) on derivative instruments during the period, tax (25.6) 5.4 (10.3) 11.5
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax (0.5) (2.2) (3.9) (5.3)
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax (0.4) 1.1 (10.5) 0.4
Net unrealized gains (losses) on derivative instruments, tax (26.5) 4.3 (24.7) 6.6
Foreign currency translation adjustment, tax 12.7 (15.8) 16.6 (21.0)
Unrecognized postretirement benefit obligation during the period, tax   12.4   (12.6)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (4.7) (0.5) (9.4) (2.0)
Net unrecognized postretirement benefit obligation, tax (4.7) 11.9 (9.4) (14.6)
Other comprehensive income (loss), tax (60.1) (87.7) (133.7) (214.5)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period 209.7 162.3 430.6 342.7
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income 19.5 19.1 26.1 19.0
Adjustments for assumed changes in amortization patterns related to available-for-sale securities (15.7) (47.5) (51.8) (78.1)
Adjustments for assumed changes in policyholder liabilities (112.8) 12.8 (142.9) 38.5
Net unrealized gains (losses) on available-for-sale securities 100.7 146.7 262.0 322.1
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period (11.0) 8.1 (14.3) 30.5
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale 1.1 0.9 3.5 (4.2)
Noncredit component of impairment losses on fixed maturities, available-for-sale (9.9) 9.0 (10.8) 26.3
Net unrealized gains (losses) on derivative instruments during the period 47.7 (10.2) 19.2 (21.5)
Reclassification adjustment for (gains) losses on derivative instruments included in net income 0.5 4.0 6.8 9.7
Adjustments for assumed changes in amortization patterns related to derivative instruments 0.7 (2.0) 19.4 (0.8)
Net unrealized gains (losses) on derivative instruments 48.9 (8.2) 45.4 (12.6)
Foreign currency translation adjustment (86.7) 49.7 (21.4) 71.5
Unrecognized postretirement benefit obligation during the period   (22.8)   23.5
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 8.8 0.9 17.5 3.8
Net unrecognized postretirement benefit obligation 8.8 (21.9) 17.5 27.3
Other comprehensive income (loss) $ 61.8 $ 175.3 $ 292.7 $ 434.6