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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax $ 310.5 $ 766.3
Other comprehensive income (loss), tax (89.4) (227.1)
Other comprehensive income (loss) 221.1 539.2
Net unrealized gains (losses) on available-for-sale securities including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss) before reclassifications, pre-tax 303.7 911.9
Adjustments for assumed changes in amortization patterns, pre-tax (15.6) (56.1)
Adjustments for assumed changes in policyholder liabilities, pre-tax (78.6) (293.1)
Other comprehensive income (loss), pre-tax 252.2 618.0
Other comprehensive income (loss) before reclassifications, tax (102.8) (312.9)
Reclassification from accumulated other comprehensive income, tax (14.9) (19.4)
Adjustments for assumed changes in amortization patterns, tax 5.4 19.6
Adjustments for assumed changes in policyholder liabilities, tax 24.0 99.1
Other comprehensive income (loss), tax (88.3) (213.6)
Other comprehensive income (loss) before reclassifications, after-tax 200.9 599.0
Reclassification from accumulated other comprehensive income, after-tax 27.8 35.9
Adjustments for assumed changes in amortization patterns, after-tax (10.2) (36.5)
Adjustments for assumed changes in policyholder liabilities, after-tax (54.6) (194.0)
Other comprehensive income (loss) 163.9 404.4
Net unrealized gains (losses) on available-for-sale securities including NCI | Net realized capital gains (losses)    
Other Comprehensive Income (Loss)    
Reclassification from accumulated other comprehensive income, pre-tax 42.7 55.3
Noncredit component of impairment losses on fixed maturities available-for-sale including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss) before reclassifications, pre-tax 1.5 (7.5)
Adjustments for assumed changes in amortization patterns, pre-tax (0.2) 0.8
Adjustments for assumed changes in policyholder liabilities, pre-tax (0.3) 0.1
Other comprehensive income (loss), pre-tax 1.0 (6.6)
Other comprehensive income (loss) before reclassifications, tax (0.5) 2.6
Adjustments for assumed changes in amortization patterns, tax 0.1 (0.2)
Adjustments for assumed changes in policyholder liabilities, tax 0.1  
Other comprehensive income (loss), tax (0.3) 2.4
Other comprehensive income (loss) before reclassifications, after-tax 1.0 (4.9)
Adjustments for assumed changes in amortization patterns, after-tax (0.1) 0.6
Adjustments for assumed changes in policyholder liabilities, after-tax (0.2) 0.1
Other comprehensive income (loss) 0.7 (4.2)
Net unrealized gains (losses) on derivative instruments including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss) before reclassifications, pre-tax (10.4) 5.7
Reclassification from accumulated other comprehensive income, pre-tax (12.5) (3.0)
Adjustments for assumed changes in amortization patterns, pre-tax 1.5 (1.4)
Adjustments for assumed changes in policyholder liabilities, pre-tax 2.9 1.0
Other comprehensive income (loss), pre-tax (18.5) 2.3
Other comprehensive income (loss) before reclassifications, tax 3.2 (2.0)
Reclassification from accumulated other comprehensive income, tax 4.5 0.9
Adjustments for assumed changes in amortization patterns, tax (0.5) 0.5
Adjustments for assumed changes in policyholder liabilities, tax (0.9) (0.4)
Other comprehensive income (loss), tax 6.3 (1.0)
Other comprehensive income (loss) before reclassifications, after-tax (7.2) 3.7
Reclassification from accumulated other comprehensive income, after-tax (8.0) (2.1)
Adjustments for assumed changes in amortization patterns, after-tax 1.0 (0.9)
Adjustments for assumed changes in policyholder liabilities, after-tax 2.0 0.6
Other comprehensive income (loss) (12.2) 1.3
Foreign currency translation adjustment including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax 68.0 138.9
Other comprehensive income (loss), tax (3.6) (9.2)
Other comprehensive income (loss) 64.4 129.7
Unrecognized postretirement benefit obligation including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax 7.8 13.7
Reclassification from accumulated other comprehensive income, tax (3.5) (5.7)
Other comprehensive income (loss), tax (3.5) (5.7)
Reclassification from accumulated other comprehensive income, after-tax 4.3 8.0
Other comprehensive income (loss) 4.3 8.0
Unrecognized postretirement benefit obligation including NCI | Operating expense    
Other Comprehensive Income (Loss)    
Reclassification from accumulated other comprehensive income, pre-tax $ 7.8 $ 13.7