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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax $ 218.1 $ 169.4 $ 1,042.3 $ 1,464.6
Other comprehensive income (loss), tax (53.0) (58.7) (317.4) (475.6)
Other comprehensive income (loss) 165.1 110.7 724.9 989.0
Net unrealized gains (losses) on available-for-sale securities including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax 137.3 312.3 1,044.2 2,178.4
Adjustments for assumed changes in amortization patterns, pre-tax (0.2) (7.6) (48.4) (119.7)
Adjustments for assumed changes in policyholder liabilities, pre-tax (23.7) (126.5) (167.2) (813.7)
Other comprehensive income (loss), pre-tax 113.7 178.8 878.5 1,265.6
Other comprehensive income (loss) before reclassifications, tax (52.6) (96.2) (365.9) (739.7)
Reclassification from accumulated other comprehensive income, tax 0.2 (2.2) (17.0) (9.2)
Adjustments for assumed changes in amortization patterns, tax (0.1) 2.6 16.9 41.9
Adjustments for assumed changes in policyholder liabilities, tax 8.9 37.3 56.6 269.3
Other comprehensive income (loss), tax (43.6) (58.5) (309.4) (437.7)
Other comprehensive income (loss) before reclassifications, after-tax 84.7 216.1 678.3 1,438.7
Reclassification from accumulated other comprehensive income, after-tax 0.5 (1.6) 32.9 11.4
Adjustments for assumed changes in amortization patterns, after-tax (0.3) (5.0) (31.5) (77.8)
Adjustments for assumed changes in policyholder liabilities, after-tax (14.8) (89.2) (110.6) (544.4)
Other comprehensive income (loss) 70.1 120.3 569.1 827.9
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 0.3 0.6 49.9 20.6
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 19.2 (10.7) 32.5 (11.6)
Adjustments for assumed changes in amortization patterns, pre-tax (1.0) 2.1 (2.1) 0.5
Adjustments for assumed changes in policyholder liabilities, pre-tax (0.2) 0.9 (0.6) 0.9
Other comprehensive income (loss), pre-tax 18.0 (7.7) 29.8 (10.2)
Other comprehensive income (loss) before reclassifications, tax (5.1) 3.4 (9.8) 3.7
Adjustments for assumed changes in amortization patterns, tax 0.4 (0.7) 0.8 (0.1)
Adjustments for assumed changes in policyholder liabilities, tax   (0.3) 0.2 (0.3)
Other comprehensive income (loss), tax (4.7) 2.4 (8.8) 3.3
Other comprehensive income (loss) before reclassifications, after-tax 14.1 (7.3) 22.7 (7.9)
Adjustments for assumed changes in amortization patterns, after-tax (0.6) 1.4 (1.3) 0.4
Adjustments for assumed changes in policyholder liabilities, after-tax (0.2) 0.6 (0.4) 0.6
Other comprehensive income (loss) 13.3 (5.3) 21.0 (6.9)
Net unrealized gains (losses) on derivative instruments including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax (17.0) (1.2) (32.5) 20.7
Reclassification from accumulated other comprehensive income, pre-tax (2.5) (2.6) (21.0) (8.7)
Adjustments for assumed changes in amortization patterns, pre-tax 0.6 0.4 2.6 1.4
Adjustments for assumed changes in policyholder liabilities, pre-tax 1.9 9.5 6.3 12.2
Other comprehensive income (loss), pre-tax (17.0) 6.1 (44.6) 25.6
Other comprehensive income (loss) before reclassifications, tax 5.9 0.3 11.1 (7.3)
Reclassification from accumulated other comprehensive income, tax 0.8 0.9 7.2 2.7
Adjustments for assumed changes in amortization patterns, tax (0.2) (0.2) (0.9) (0.5)
Adjustments for assumed changes in policyholder liabilities, tax (0.6) (3.4) (2.1) (4.3)
Other comprehensive income (loss), tax 5.9 (2.4) 15.3 (9.4)
Other comprehensive income (loss) before reclassifications, after-tax (11.1) (0.9) (21.4) 13.4
Reclassification from accumulated other comprehensive income, after-tax (1.7) (1.7) (13.8) (6.0)
Adjustments for assumed changes in amortization patterns, after-tax 0.4 0.2 1.7 0.9
Adjustments for assumed changes in policyholder liabilities, after-tax 1.3 6.1 4.2 7.9
Other comprehensive income (loss) (11.1) 3.7 (29.3) 16.2
Foreign currency translation adjustment including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax 95.7 (21.4) 155.3 142.6
Other comprehensive income (loss), tax (7.1) 5.4 (4.0) (14.8)
Other comprehensive income (loss) 88.6 (16.0) 151.3 127.8
Unrecognized postretirement benefit obligation including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax 7.7 13.6 23.3 41.0
Reclassification from accumulated other comprehensive income, tax (3.5) (5.6) (10.5) (17.0)
Other comprehensive income (loss), tax (3.5) (5.6) (10.5) (17.0)
Reclassification from accumulated other comprehensive income, after-tax 4.2 8.0 12.8 24.0
Other comprehensive income (loss) 4.2 8.0 12.8 24.0
Unrecognized postretirement benefit obligation including NCI | Operating expense        
Other Comprehensive Income (Loss)        
Reclassification from accumulated other comprehensive income, pre-tax $ 7.7 $ 13.6 $ 23.3 $ 41.0