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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax $ 3,326.3 $ (2,258.6) $ 1,141.1
Other comprehensive income (loss), tax (719.6) 422.9 (296.8)
Other comprehensive income (loss) 2,606.7 (1,835.7) 844.3
Net unrealized gains (losses) on available-for-sale securities including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax 4,414.1 (2,517.5) 1,074.2
Adjustments for assumed changes in amortization patterns, pre-tax (293.0) 185.9 (26.2)
Adjustments for assumed changes in policyholder liabilities, pre-tax (847.7) 346.9 (184.6)
Other comprehensive income (loss), pre-tax 3,320.8 (1,928.3) 931.2
Other comprehensive income (loss) before reclassifications, tax (947.0) 515.4 (341.6)
Reclassification from accumulated other comprehensive income, tax (9.7) (5.3) (23.5)
Adjustments for assumed changes in amortization patterns, tax 61.5 (39.1) 9.3
Adjustments for assumed changes in policyholder liabilities, tax 190.5 (72.3) 64.1
Other comprehensive income (loss), tax (704.7) 398.7 (291.7)
Other comprehensive income (loss) before reclassifications, after-tax 3,467.1 (2,002.1) 732.6
Reclassification from accumulated other comprehensive income, after-tax 37.7 51.1 44.3
Adjustments for assumed changes in amortization patterns, after-tax (231.5) 146.8 (16.9)
Adjustments for assumed changes in policyholder liabilities, after-tax (657.2) 274.6 (120.5)
Other comprehensive income (loss) 2,616.1 (1,529.6) 639.5
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 47.4 56.4 67.8
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 5.2 39.7 53.1
Adjustments for assumed changes in amortization patterns, pre-tax (1.4) (5.3) (6.4)
Adjustments for assumed changes in policyholder liabilities, pre-tax   (0.8) (1.3)
Other comprehensive income (loss), pre-tax 3.8 33.6 45.4
Other comprehensive income (loss) before reclassifications, tax (1.1) (8.4) (17.0)
Adjustments for assumed changes in amortization patterns, tax 0.3 1.1 2.3
Adjustments for assumed changes in policyholder liabilities, tax   0.1 0.5
Other comprehensive income (loss), tax (0.8) (7.2) (14.2)
Other comprehensive income (loss) before reclassifications, after-tax 4.1 31.3 36.1
Adjustments for assumed changes in amortization patterns, after-tax (1.1) (4.2) (4.1)
Adjustments for assumed changes in policyholder liabilities, after-tax   (0.7) (0.8)
Other comprehensive income (loss) 3.0 26.4 31.2
Net unrealized gains (losses) on derivative instruments including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (0.5)    
Reclassification from accumulated other comprehensive income, pre-tax (23.9)    
Adjustments for assumed changes in amortization patterns, pre-tax 3.1    
Adjustments for assumed changes in policyholder liabilities, pre-tax 7.9    
Other comprehensive income (loss), pre-tax (13.4)    
Reclassification from accumulated other comprehensive income, tax 4.9    
Adjustments for assumed changes in amortization patterns, tax (0.6)    
Adjustments for assumed changes in policyholder liabilities, tax (1.9)    
Other comprehensive income (loss), tax 2.4    
Other comprehensive income (loss) before reclassifications, after-tax (0.5)    
Reclassification from accumulated other comprehensive income, after-tax (19.0)    
Adjustments for assumed changes in amortization patterns, after-tax 2.5    
Adjustments for assumed changes in policyholder liabilities, after-tax 6.0    
Other comprehensive income (loss) (11.0)    
Net unrealized gains (losses) on derivative instruments including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax   50.4 (46.7)
Reclassification from accumulated other comprehensive income, pre-tax   (40.1) (31.6)
Adjustments for assumed changes in amortization patterns, pre-tax   0.3 3.9
Adjustments for assumed changes in policyholder liabilities, pre-tax   5.7 9.6
Other comprehensive income (loss), pre-tax   16.3 (64.8)
Other comprehensive income (loss) before reclassifications, tax   (3.4) 16.0
Reclassification from accumulated other comprehensive income, tax   4.2 10.8
Adjustments for assumed changes in amortization patterns, tax   (0.1) (1.3)
Adjustments for assumed changes in policyholder liabilities, tax   (1.0) (3.3)
Other comprehensive income (loss), tax   (0.3) 22.2
Other comprehensive income (loss) before reclassifications, after-tax   47.0 (30.7)
Reclassification from accumulated other comprehensive income, after-tax   (35.9) (20.8)
Adjustments for assumed changes in amortization patterns, after-tax   0.2 2.6
Adjustments for assumed changes in policyholder liabilities, after-tax   4.7 6.3
Other comprehensive income (loss)   16.0 (42.6)
Foreign currency translation adjustment including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (112.3)   171.6
Reclassification from accumulated other comprehensive income, pre-tax 26.1   2.6
Other comprehensive income (loss), pre-tax (86.2) (303.9) 174.2
Other comprehensive income (loss) before reclassifications, tax 7.5   4.7
Other comprehensive income (loss), tax 7.5 16.3 4.7
Other comprehensive income (loss) before reclassifications, after-tax (104.8)   176.3
Reclassification from accumulated other comprehensive income, after-tax 26.1    
Other comprehensive income (loss) (78.7) (287.6) 178.9
Foreign currency translation adjustment including NCI | Net realized capital gains (losses)      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, after-tax     2.6
Foreign currency translation adjustment relating to noncontrolling interest | Net realized capital gains (losses)      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-tax 5.7   2.0
Unrecognized postretirement benefit obligation including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax 43.6 (125.3) 24.0
Other comprehensive income (loss), pre-tax 101.3 (76.3) 55.1
Other comprehensive income (loss) before reclassifications, tax (8.6) 29.4 (3.8)
Reclassification from accumulated other comprehensive income, tax (15.4) (14.0) (14.0)
Other comprehensive income (loss), tax (24.0) 15.4 (17.8)
Other comprehensive income (loss) before reclassifications, after-tax 35.0 (95.9) 20.2
Reclassification from accumulated other comprehensive income, after-tax 42.3 35.0 17.1
Other comprehensive income (loss) 77.3 (60.9) 37.3
Unrecognized postretirement benefit obligation including NCI | Operating expense      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-tax $ 57.7 $ 49.0 $ 31.1