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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax $ (802.9) $ 513.7 $ (1,748.1) $ 824.2
Other comprehensive income (loss), tax 130.6 (175.0) 339.7 (264.4)
Other comprehensive income (loss) (672.3) 338.7 (1,408.4) 559.8
Net unrealized gains (losses) on available-for-sale securities including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax (777.8) 603.2 (2,081.5) 906.9
Adjustments for assumed changes in amortization patterns, pre-tax 54.2 (32.6) 140.4 (48.2)
Adjustments for assumed changes in policyholder liabilities, pre-tax 102.2 (64.9) 280.7 (143.5)
Other comprehensive income (loss), pre-tax (594.9) 512.6 (1,613.2) 764.8
Other comprehensive income (loss) before reclassifications, tax 158.1 (210.5) 438.5 (313.3)
Reclassification from accumulated other comprehensive income, tax (5.6) (2.3) (10.0) (17.2)
Adjustments for assumed changes in amortization patterns, tax (11.4) 11.6 (29.5) 17.0
Adjustments for assumed changes in policyholder liabilities, tax (12.3) 23.7 (57.4) 47.7
Other comprehensive income (loss), tax 128.8 (177.5) 341.6 (265.8)
Other comprehensive income (loss) before reclassifications, after-tax (619.7) 392.7 (1,643.0) 593.6
Reclassification from accumulated other comprehensive income, after-tax 20.9 4.6 37.2 32.4
Adjustments for assumed changes in amortization patterns, after-tax 42.8 (21.0) 110.9 (31.2)
Adjustments for assumed changes in policyholder liabilities, after-tax 89.9 (41.2) 223.3 (95.8)
Other comprehensive income (loss) (466.1) 335.1 (1,271.6) 499.0
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 26.5 6.9 47.2 49.6
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 0.8 11.8 12.0 13.3
Adjustments for assumed changes in amortization patterns, pre-tax   (0.9) 1.3 (1.1)
Adjustments for assumed changes in policyholder liabilities, pre-tax 0.1 (0.1) (0.5) (0.4)
Other comprehensive income (loss), pre-tax 0.9 10.8 12.8 11.8
Other comprehensive income (loss) before reclassifications, tax (0.2) (4.2) (2.6) (4.7)
Adjustments for assumed changes in amortization patterns, tax 0.1 0.3 (0.2) 0.4
Adjustments for assumed changes in policyholder liabilities, tax   0.1 0.1 0.2
Other comprehensive income (loss), tax (0.1) (3.8) (2.7) (4.1)
Other comprehensive income (loss) before reclassifications, after-tax 0.6 7.6 9.4 8.6
Adjustments for assumed changes in amortization patterns, after-tax 0.1 (0.6) 1.1 (0.7)
Adjustments for assumed changes in policyholder liabilities, after-tax 0.1   (0.4) (0.2)
Other comprehensive income (loss) 0.8 7.0 10.1 7.7
Net unrealized gains (losses) on derivative instruments including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss) before reclassifications, pre-tax 27.7 (5.1) 8.5 (15.5)
Reclassification from accumulated other comprehensive income, pre-tax (3.3) (6.0) (5.7) (18.5)
Adjustments for assumed changes in amortization patterns, pre-tax   0.5 0.9 2.0
Adjustments for assumed changes in policyholder liabilities, pre-tax 1.4 1.5 4.2 4.4
Other comprehensive income (loss), pre-tax 25.8 (9.1) 7.9 (27.6)
Other comprehensive income (loss) before reclassifications, tax (5.8) 2.0 (1.8) 5.2
Reclassification from accumulated other comprehensive income, tax 0.5 1.9 0.9 6.4
Adjustments for assumed changes in amortization patterns, tax   (0.2) (0.2) (0.7)
Adjustments for assumed changes in policyholder liabilities, tax (0.2) (0.6) (0.9) (1.5)
Other comprehensive income (loss), tax (5.5) 3.1 (2.0) 9.4
Other comprehensive income (loss) before reclassifications, after-tax 21.9 (3.1) 6.7 (10.3)
Reclassification from accumulated other comprehensive income, after-tax (2.8) (4.1) (4.8) (12.1)
Adjustments for assumed changes in amortization patterns, after-tax   0.3 0.7 1.3
Adjustments for assumed changes in policyholder liabilities, after-tax 1.2 0.9 3.3 2.9
Other comprehensive income (loss) 20.3 (6.0) 5.9 (18.2)
Foreign currency translation adjustment including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax (247.0) (8.4) (180.1) 59.6
Other comprehensive income (loss), tax 10.9 6.7 9.8 3.1
Other comprehensive income (loss) (236.1) (1.7) (170.3) 62.7
Unrecognized postretirement benefit obligation including NCI        
Other Comprehensive Income (Loss)        
Other comprehensive income (loss), pre-tax 12.3 7.8 (24.5) 15.6
Reclassification from accumulated other comprehensive income, tax (3.5) (3.5) (7.0) (7.0)
Other comprehensive income (loss), tax (3.5) (3.5) (7.0) (7.0)
Reclassification from accumulated other comprehensive income, after-tax 8.8 4.3 17.5 8.6
Other comprehensive income (loss) 8.8 4.3 17.5 8.6
Unrecognized postretirement benefit obligation including NCI | Operating expense        
Other Comprehensive Income (Loss)        
Reclassification from accumulated other comprehensive income, pre-tax $ 12.3 $ 7.8 $ 24.5 $ 15.6