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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax $ (2,258.6) $ 1,141.1 $ 317.6
Other comprehensive income (loss), tax 422.9 (296.8) (96.6)
Other comprehensive income (loss) (1,835.7) 844.3 221.0
Net unrealized gains (losses) on available-for-sale securities including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (2,517.5) 1,074.2 254.6
Adjustments for assumed changes in amortization patterns, pre-tax 185.9 (26.2) 5.6
Adjustments for assumed changes in policyholder liabilities, pre-tax 346.9 (184.6) (177.2)
Other comprehensive income (loss), pre-tax (1,928.3) 931.2 150.9
Other comprehensive income (loss) before reclassifications, tax 515.4 (341.6) (78.1)
Reclassification from accumulated other comprehensive income, tax (5.3) (23.5) (23.5)
Adjustments for assumed changes in amortization patterns, tax (39.1) 9.3 (2.0)
Adjustments for assumed changes in policyholder liabilities, tax (72.3) 64.1 51.8
Other comprehensive income (loss), tax 398.7 (291.7) (51.8)
Other comprehensive income (loss) before reclassifications, after-tax (2,002.1) 732.6 176.5
Reclassification from accumulated other comprehensive income, after-tax 51.1 44.3 44.4
Adjustments for assumed changes in amortization patterns, after-tax 146.8 (16.9) 3.6
Adjustments for assumed changes in policyholder liabilities, after-tax 274.6 (120.5) (125.4)
Other comprehensive income (loss) (1,529.6) 639.5 99.1
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 56.4 67.8 67.9
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 39.7 53.1 (0.3)
Adjustments for assumed changes in amortization patterns, pre-tax (5.3) (6.4) (3.4)
Adjustments for assumed changes in policyholder liabilities, pre-tax (0.8) (1.3) 0.8
Other comprehensive income (loss), pre-tax 33.6 45.4 (2.9)
Other comprehensive income (loss) before reclassifications, tax (8.4) (17.0) (1.5)
Adjustments for assumed changes in amortization patterns, tax 1.1 2.3 1.2
Adjustments for assumed changes in policyholder liabilities, tax 0.1 0.5 (0.3)
Other comprehensive income (loss), tax (7.2) (14.2) (0.6)
Other comprehensive income (loss) before reclassifications, after-tax 31.3 36.1 (1.8)
Adjustments for assumed changes in amortization patterns, after-tax (4.2) (4.1) (2.2)
Adjustments for assumed changes in policyholder liabilities, after-tax (0.7) (0.8) 0.5
Other comprehensive income (loss) 26.4 31.2 (3.5)
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) 32.6
Reclassification from accumulated other comprehensive income, pre-tax (40.1) (31.6) (27.7)
Adjustments for assumed changes in amortization patterns, pre-tax 0.3 3.9 2.9
Adjustments for assumed changes in policyholder liabilities, pre-tax 5.7 9.6 16.9
Other comprehensive income (loss), pre-tax 16.3 (64.8) 24.7
Other comprehensive income (loss) before reclassifications, tax (3.4) 16.0 (7.6)
Reclassification from accumulated other comprehensive income, tax 4.2 10.8 5.4
Adjustments for assumed changes in amortization patterns, tax (0.1) (1.3) (1.0)
Adjustments for assumed changes in policyholder liabilities, tax (1.0) (3.3) (6.0)
Other comprehensive income (loss), tax (0.3) 22.2 (9.2)
Other comprehensive income (loss) before reclassifications, after-tax 47.0 (30.7) 25.0
Reclassification from accumulated other comprehensive income, after-tax (35.9) (20.8) (22.3)
Adjustments for assumed changes in amortization patterns, after-tax 0.2 2.6 1.9
Adjustments for assumed changes in policyholder liabilities, after-tax 4.7 6.3 10.9
Other comprehensive income (loss) 16.0 (42.6) 15.5
Foreign currency translation adjustment including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax   171.6  
Other comprehensive income (loss), pre-tax (303.9) 174.2 75.6
Other comprehensive income (loss) before reclassifications, tax   4.7  
Other comprehensive income (loss), tax 16.3 4.7 (7.5)
Other comprehensive income (loss) before reclassifications, after-tax   176.3  
Reclassification from accumulated other comprehensive income, after-tax   2.6  
Other comprehensive income (loss) (287.6) 178.9 68.1
Foreign currency translation adjustment including NCI | Net realized capital gains (losses)      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-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   2.0  
Unrecognized postretirement benefit obligation including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (125.3) 24.0 20.2
Other comprehensive income (loss), pre-tax (76.3) 55.1 69.3
Other comprehensive income (loss) before reclassifications, tax 29.4 (3.8) (6.8)
Reclassification from accumulated other comprehensive income, tax (14.0) (14.0) (20.7)
Other comprehensive income (loss), tax 15.4 (17.8) (27.5)
Other comprehensive income (loss) before reclassifications, after-tax (95.9) 20.2 13.4
Reclassification from accumulated other comprehensive income, after-tax 35.0 17.1 28.4
Other comprehensive income (loss) (60.9) 37.3 41.8
Unrecognized postretirement benefit obligation including NCI | Operating expense      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-tax $ 49.0 $ 31.1 $ 49.1