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Stockholders' Equity (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Comprehensive Income (Loss) Pre-Tax        
Other comprehensive income (loss), pre-tax $ (500.7) $ 356.3 $ (497.3) $ 635.7
Other Comprehensive Income (Loss) Tax        
Other comprehensive income (loss), tax 151.1 (116.9) 125.5 (219.7)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on available-for-sale securities (306.4) 178.3 (249.3) 370.5
Noncredit component of impairment losses on fixed maturities, available-for-sale 3.4 20.4 16.9 37.9
Net unrealized gains (losses) on derivative instruments (16.1) 4.1 11.7 13.1
Foreign currency translation adjustment (42.5) 33.0 (175.1) (12.6)
Net unrecognized postretirement benefit obligation 12.0 3.6 24.0 7.1
Other comprehensive income (loss) (349.6) 239.4 (371.8) 416.0
Net unrealized gains (losses) on available-for-sale securities including NCI        
Other Comprehensive Income (Loss) Pre-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax (1,090.4) 651.2 (807.1) 1,311.7
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax 5.1 (38.7) (8.5) (61.7)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax 95.7 (44.9) 82.4 (99.2)
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, pre-tax 526.1 (290.0) 357.3 (584.5)
Net unrealized gains (losses) on available-for-sale securities, pre-tax (463.5) 277.6 (375.9) 566.3
Other Comprehensive Income (Loss) Tax        
Net unrealized gains (losses) on available-for-sale securities during the period, tax 372.6 (221.2) 274.3 (444.5)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax (1.7) 12.6 3.0 20.2
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax (33.5) 15.7 (28.8) 34.7
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, tax (180.3) 93.6 (121.9) 193.8
Net unrealized gains (losses) on available-for-sale securities, tax 157.1 (99.3) 126.6 (195.8)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on available-for-sale securities during the period (717.8) 430.0 (532.8) 867.2
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income 3.4 (26.1) (5.5) (41.5)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities 62.2 (29.2) 53.6 (64.5)
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities 345.8 (196.4) 235.4 (390.7)
Net unrealized gains (losses) on available-for-sale securities (306.4) 178.3 (249.3) 370.5
Noncredit component of impairment losses on fixed maturities available-for-sale including NCI        
Other Comprehensive Income (Loss) Pre-Tax        
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax 5.4 37.8 26.9 67.9
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax   (5.2) (1.3) (8.4)
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax   (0.4) 0.2 (0.6)
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 5.4 32.2 25.8 58.9
Other Comprehensive Income (Loss) Tax        
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax (2.0) (13.8) (9.4) (24.3)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax   1.8 0.5 3.1
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax   0.2   0.2
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax (2.0) (11.8) (8.9) (21.0)
Other Comprehensive Income (Loss) After-Tax        
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period 3.4 24.0 17.5 43.6
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale   (3.4) (0.8) (5.3)
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale   (0.2) 0.2 (0.4)
Noncredit component of impairment losses on fixed maturities, available-for-sale 3.4 20.4 16.9 37.9
Net unrealized gains (losses) on derivative instruments including NCI        
Other Comprehensive Income (Loss) Pre-Tax        
Net unrealized gains (losses) on derivative instruments during the period, pre-tax (23.9) 9.6 28.4 19.3
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax (7.7) (1.6) (17.8) 8.1
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax 2.4 (0.3) 12.5 (0.5)
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, pre-tax 4.4 (1.2) (4.8) (6.5)
Net unrealized gains (losses) on derivative instruments, pre-tax (24.8) 6.5 18.3 20.4
Other Comprehensive Income (Loss) Tax        
Net unrealized gains (losses) on derivative instruments during the period, tax 8.5 (3.4) (9.9) (6.8)
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax 2.6 0.5 6.0 (3.0)
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax (0.8) 0.2 (4.4) 0.2
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, tax (1.6) 0.3 1.7 2.3
Net unrealized gains (losses) on derivative instruments, tax 8.7 (2.4) (6.6) (7.3)
Other Comprehensive Income (Loss) After-Tax        
Net unrealized gains (losses) on derivative instruments during the period (15.4) 6.2 18.5 12.5
Reclassification adjustment for (gains) losses on derivative instruments included in net income (5.1) (1.1) (11.8) 5.1
Adjustments for assumed changes in amortization patterns related to derivative instruments 1.6 (0.1) 8.1 (0.3)
Adjustments for assumed changes in policyholder liabilities related to derivative instruments 2.8 (0.9) (3.1) (4.2)
Net unrealized gains (losses) on derivative instruments (16.1) 4.1 11.7 13.1
Foreign currency translation adjustment including NCI        
Other Comprehensive Income (Loss) Pre-Tax        
Foreign currency translation adjustment, pre-tax (38.1) 34.5 (206.1) (20.9)
Other Comprehensive Income (Loss) Tax        
Foreign currency translation adjustment, tax (4.4) (1.5) 31.0 8.3
Other Comprehensive Income (Loss) After-Tax        
Foreign currency translation adjustment (42.5) 33.0 (175.1) (12.6)
Unrecognized postretirement benefit obligation including NCI        
Other Comprehensive Income (Loss) Pre-Tax        
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 20.3 5.5 40.6 11.0
Net unrecognized postretirement benefit obligation, pre-tax 20.3 5.5 40.6 11.0
Other Comprehensive Income (Loss) Tax        
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (8.3) (1.9) (16.6) (3.9)
Net unrecognized postretirement benefit obligation, tax (8.3) (1.9) (16.6) (3.9)
Other Comprehensive Income (Loss) After-Tax        
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 12.0 3.6 24.0 7.1
Net unrecognized postretirement benefit obligation $ 12.0 $ 3.6 $ 24.0 $ 7.1