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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax $ 513.7 $ 528.9 $ 824.2 $ 1,295.2
Other comprehensive income (loss), tax (175.0) (189.8) (264.4) (416.9)
Other comprehensive income (loss) 338.7 339.1 559.8 878.3
Net unrealized gains (losses) on available-for-sale securities including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax 603.2 954.2 906.9 1,866.1
Adjustments for assumed changes in amortization patterns, pre-tax (32.6) (56.0) (48.2) (112.1)
Adjustments for assumed changes in policyholder liabilities, pre-tax (64.9) (394.1) (143.5) (687.2)
Other comprehensive income (loss), pre-tax 512.6 468.8 764.8 1,086.8
Other comprehensive income (loss) before reclassifications, tax (210.5) (330.6) (313.3) (643.5)
Reclassification from accumulated other comprehensive income, tax (2.3) 12.4 (17.2) (7.0)
Adjustments for assumed changes in amortization patterns, tax 11.6 19.7 17.0 39.3
Adjustments for assumed changes in policyholder liabilities, tax 23.7 132.9 47.7 232.0
Other comprehensive income (loss), tax (177.5) (165.6) (265.8) (379.2)
Other comprehensive income (loss) before reclassifications, after-tax 392.7 623.6 593.6 1,222.6
Reclassification from accumulated other comprehensive income, after-tax 4.6 (22.9) 32.4 13.0
Adjustments for assumed changes in amortization patterns, after-tax (21.0) (36.3) (31.2) (72.8)
Adjustments for assumed changes in policyholder liabilities, after-tax (41.2) (261.2) (95.8) (455.2)
Other comprehensive income (loss) 335.1 303.2 499.0 707.6
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 6.9 (35.3) 49.6 20.0
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 11.8 6.6 13.3 (0.9)
Adjustments for assumed changes in amortization patterns, pre-tax (0.9) (2.4) (1.1) (1.6)
Adjustments for assumed changes in policyholder liabilities, pre-tax (0.1) (0.1) (0.4)  
Other comprehensive income (loss), pre-tax 10.8 4.1 11.8 (2.5)
Other comprehensive income (loss) before reclassifications, tax (4.2) (2.3) (4.7) 0.3
Adjustments for assumed changes in amortization patterns, tax 0.3 0.8 0.4 0.6
Adjustments for assumed changes in policyholder liabilities, tax 0.1   0.2  
Other comprehensive income (loss), tax (3.8) (1.5) (4.1) 0.9
Other comprehensive income (loss) before reclassifications, after-tax 7.6 4.3 8.6 (0.6)
Adjustments for assumed changes in amortization patterns, after-tax (0.6) (1.6) (0.7) (1.0)
Adjustments for assumed changes in policyholder liabilities, after-tax   (0.1) (0.2)  
Other comprehensive income (loss) 7.0 2.6 7.7 (1.6)
Net unrealized gains (losses) on derivative instruments including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax (5.1) 16.2 (15.5) 21.9
Reclassification from accumulated other comprehensive income, pre-tax (6.0) (3.1) (18.5) (6.1)
Adjustments for assumed changes in amortization patterns, pre-tax 0.5 2.4 2.0 1.0
Adjustments for assumed changes in policyholder liabilities, pre-tax 1.5 1.7 4.4 2.7
Other comprehensive income (loss), pre-tax (9.1) 17.2 (27.6) 19.5
Other comprehensive income (loss) before reclassifications, tax 2.0 (5.6) 5.2 (7.6)
Reclassification from accumulated other comprehensive income, tax 1.9 0.9 6.4 1.8
Adjustments for assumed changes in amortization patterns, tax (0.2) (0.8) (0.7) (0.3)
Adjustments for assumed changes in policyholder liabilities, tax (0.6) (0.5) (1.5) (0.9)
Other comprehensive income (loss), tax 3.1 (6.0) 9.4 (7.0)
Other comprehensive income (loss) before reclassifications, after-tax (3.1) 10.6 (10.3) 14.3
Reclassification from accumulated other comprehensive income, after-tax (4.1) (2.2) (12.1) (4.3)
Adjustments for assumed changes in amortization patterns, after-tax 0.3 1.6 1.3 0.7
Adjustments for assumed changes in policyholder liabilities, after-tax 0.9 1.2 2.9 1.8
Other comprehensive income (loss) (6.0) 11.2 (18.2) 12.5
Foreign currency translation adjustment including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax (8.4) 25.1 59.6 164.0
Other comprehensive income (loss), tax 6.7 (11.0) 3.1 (20.2)
Other comprehensive income (loss) (1.7) 14.1 62.7 143.8
Unrecognized postretirement benefit obligation including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax 7.8 13.7 15.6 27.4
Reclassification from accumulated other comprehensive income, tax (3.5) (5.7) (7.0) (11.4)
Other comprehensive income (loss), tax (3.5) (5.7) (7.0) (11.4)
Reclassification from accumulated other comprehensive income, after-tax 4.3 8.0 8.6 16.0
Other comprehensive income (loss) 4.3 8.0 8.6 16.0
Unrecognized postretirement benefit obligation including NCI | Operating expense        
Other Comprehensive Income (Loss)        
Reclassification from accumulated other comprehensive income, pre-tax $ 7.8 $ 13.7 $ 15.6 $ 27.4