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Stockholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Comprehensive Income (Loss) Pre-Tax    
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax $ 660.5 $ (132.3)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax (23.0) 34.1
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax (54.3) 43.7
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, pre-tax (294.5) (91.9)
Net unrealized gains (losses) on available-for-sale securities, pre-tax 288.7 (146.4)
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax 30.1 (20.2)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (3.2) 1.2
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (0.2) 1.4
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 26.7 (17.6)
Net unrealized gains (losses) on derivative instruments during the period, pre-tax 9.7 32.6
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax 9.7 (0.5)
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax (0.2) 1.0
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, pre-tax (5.3)  
Net unrealized gains (losses) on derivative instruments, pre-tax 13.9 33.1
Foreign currency translation adjustment, pre-tax (55.4) 55.1
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 5.5 21.2
Net unrecognized postretirement benefit obligation, pre-tax 5.5 21.2
Other comprehensive income (loss), pre-tax 279.4 (54.6)
Other Comprehensive Income (Loss) Tax    
Net unrealized gains (losses) on available-for-sale securities during the period, tax (223.3) 46.0
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax 7.6 (11.7)
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax 19.0 (15.3)
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, tax 100.2 28.1
Net unrealized gains (losses) on available-for-sale securities, tax (96.5) 47.1
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax (10.5) 7.1
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax 1.3 (0.2)
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax   (0.6)
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax (9.2) 6.3
Net unrealized gains (losses) on derivative instruments during the period, tax (3.4) (10.8)
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax (3.5) 0.1
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax   (0.4)
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, tax 2.0  
Net unrealized gains (losses) on derivative instruments, tax (4.9) (11.1)
Foreign currency translation adjustment, tax 9.8 (0.7)
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (2.0) (7.4)
Net unrecognized postretirement benefit obligation, tax (2.0) (7.4)
Other comprehensive income (loss), tax (102.8) 34.2
Other Comprehensive Income (Loss) After-Tax    
Net unrealized gains (losses) on available-for-sale securities during the period 437.2 (86.3)
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income (15.4) 22.4
Adjustments for assumed changes in amortization patterns related to available-for-sale securities (35.3) 28.4
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities (194.3) (63.8)
Net unrealized gains (losses) on available-for-sale securities 192.2 (99.3)
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period 19.6 (13.1)
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale (1.9) 1.0
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale (0.2) 0.8
Noncredit component of impairment losses on fixed maturities, available-for-sale 17.5 (11.3)
Net unrealized gains (losses) on derivative instruments during the period 6.3 21.8
Reclassification adjustment for (gains) losses on derivative instruments included in net income 6.2 (0.4)
Adjustments for assumed changes in amortization patterns related to derivative instruments (0.2) 0.6
Adjustments for assumed changes in policyholder liabilities related to derivative instruments (3.3)  
Net unrealized gains (losses) on derivative instruments 9.0 22.0
Foreign currency translation adjustment (45.6) 54.4
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 3.5 13.8
Net unrecognized postretirement benefit obligation 3.5 13.8
Other comprehensive income (loss) $ 176.6 $ (20.4)