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Stockholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other Comprehensive Income (Loss) Pre-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax $ 810.7 $ 58.9 $ 1,436.7 $ 605.8
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax 56.4 7.4 96.5 34.5
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax (145.8) 21.6 (225.4) (98.6)
Adjustments for assumed changes in policyholder liabilities, pre-tax (271.5) (71.8) (474.1) (33.3)
Net unrealized gains (losses) on available-for-sale securities, pre-tax 449.8 16.1 833.7 508.4
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax (9.2) 35.4 (31.2) 83.5
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 3.0 (6.4) 8.5 (12.9)
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (6.2) 29.0 (22.7) 70.6
Net unrealized gains (losses) on derivative instruments during the period, pre-tax (23.9) 73.0 5.6 40.0
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax (0.5) (0.8) 10.2 14.2
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax (3.5) (22.8) 26.4 (24.0)
Net unrealized gains (losses) on derivative instruments, pre-tax (27.9) 49.4 42.2 30.2
Foreign currency translation adjustment, pre-tax 49.2 (138.5) 11.2 (46.0)
Unrecognized postretirement benefit obligation during the period, pre-tax   (312.9)   (276.8)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 13.4 3.0 40.3 8.8
Net unrecognized postretirement benefit obligation, pre-tax 13.4 (309.9) 40.3 (268.0)
Other comprehensive income (loss), pre-tax 478.3 (353.9) 904.7 295.2
Other Comprehensive Income (Loss) Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, tax (273.5) (2.8) (468.9) (207.0)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax (20.3) (4.4) (34.3) (12.5)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax 51.1 (7.6) 78.9 34.5
Adjustments for assumed changes in policyholder liabilities, tax 88.9 6.1 148.6 6.1
Net unrealized gains (losses) on available-for-sale securities, tax (153.8) (8.7) (275.7) (178.9)
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax 3.2 (12.3) 10.9 (29.9)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax (1.0) 2.2 (3.0) 4.5
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax 2.2 (10.1) 7.9 (25.4)
Net unrealized gains (losses) on derivative instruments during the period, tax 8.3 (25.5) (2.0) (14.0)
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax 0.2 0.2 (3.7) (5.1)
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax 1.2 8.0 (9.3) 8.4
Net unrealized gains (losses) on derivative instruments, tax 9.7 (17.3) (15.0) (10.7)
Foreign currency translation adjustment, tax (0.6) 2.1 16.0 (18.9)
Unrecognized postretirement benefit obligation during the period, tax   109.5   96.9
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (4.7) (1.1) (14.1) (3.1)
Net unrecognized postretirement benefit obligation, tax (4.7) 108.4 (14.1) 93.8
Other comprehensive income (loss), tax (147.2) 74.4 (280.9) (140.1)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period 537.2 56.1 967.8 398.8
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income 36.1 3.0 62.2 22.0
Adjustments for assumed changes in amortization patterns related to available-for-sale securities (94.7) 14.0 (146.5) (64.1)
Adjustments for assumed changes in policyholder liabilities (182.6) (65.7) (325.5) (27.2)
Net unrealized gains (losses) on available-for-sale securities 296.0 7.4 558.0 329.5
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period (6.0) 23.1 (20.3) 53.6
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale 2.0 (4.2) 5.5 (8.4)
Noncredit component of impairment losses on fixed maturities, available-for-sale (4.0) 18.9 (14.8) 45.2
Net unrealized gains (losses) on derivative instruments during the period (15.6) 47.5 3.6 26.0
Reclassification adjustment for (gains) losses on derivative instruments included in net income (0.3) (0.6) 6.5 9.1
Adjustments for assumed changes in amortization patterns related to derivative instruments (2.3) (14.8) 17.1 (15.6)
Net unrealized gains (losses) on derivative instruments (18.2) 32.1 27.2 19.5
Foreign currency translation adjustment 48.6 (136.4) 27.2 (64.9)
Unrecognized postretirement benefit obligation during the period   (203.4)   (179.9)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 8.7 1.9 26.2 5.7
Net unrecognized postretirement benefit obligation 8.7 (201.5) 26.2 (174.2)
Other comprehensive income (loss) $ 331.1 $ (279.5) $ 623.8 $ 155.1