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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax $ 1,141.1 $ 317.6 $ (1,263.9)
Other comprehensive income (loss), tax (296.8) (96.6) 320.8
Other comprehensive income (loss) 844.3 221.0 (943.1)
Net unrealized gains (losses) on available-for-sale securities including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax 1,074.2 254.6 (1,713.7)
Adjustments for assumed changes in amortization patterns, pre-tax (26.2) 5.6 201.2
Adjustments for assumed changes in policyholder liabilities, pre-tax (184.6) (177.2) 779.0
Other comprehensive income (loss), pre-tax 931.2 150.9 (718.4)
Other comprehensive income (loss) before reclassifications, tax (341.6) (78.1) 589.0
Reclassification from accumulated other comprehensive income, tax (23.5) (23.5) (5.4)
Adjustments for assumed changes in amortization patterns, tax 9.3 (2.0) (70.4)
Adjustments for assumed changes in policyholder liabilities, tax 64.1 51.8 (265.5)
Other comprehensive income (loss), tax (291.7) (51.8) 247.7
Other comprehensive income (loss) before reclassifications, after-tax 732.6 176.5 (1,124.7)
Reclassification from accumulated other comprehensive income, after-tax 44.3 44.4 9.7
Adjustments for assumed changes in amortization patterns, after-tax (16.9) 3.6 130.8
Adjustments for assumed changes in policyholder liabilities, after-tax (120.5) (125.4) 513.5
Other comprehensive income (loss) 639.5 99.1 (470.7)
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 67.8 67.9 15.1
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 53.1 (0.3) 29.4
Adjustments for assumed changes in amortization patterns, pre-tax (6.4) (3.4) (0.9)
Adjustments for assumed changes in policyholder liabilities, pre-tax (1.3) 0.8 0.7
Other comprehensive income (loss), pre-tax 45.4 (2.9) 29.2
Other comprehensive income (loss) before reclassifications, tax (17.0) (1.5) (10.2)
Adjustments for assumed changes in amortization patterns, tax 2.3 1.2 0.3
Adjustments for assumed changes in policyholder liabilities, tax 0.5 (0.3) (0.2)
Other comprehensive income (loss), tax (14.2) (0.6) (10.1)
Other comprehensive income (loss) before reclassifications, after-tax 36.1 (1.8) 19.2
Adjustments for assumed changes in amortization patterns, after-tax (4.1) (2.2) (0.6)
Adjustments for assumed changes in policyholder liabilities, after-tax (0.8) 0.5 0.5
Other comprehensive income (loss) 31.2 (3.5) 19.1
Net unrealized gains (losses) on derivative instruments including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (46.7) 32.6 58.4
Reclassification from accumulated other comprehensive income, pre-tax (31.6) (27.7) (36.9)
Adjustments for assumed changes in amortization patterns, pre-tax 3.9 2.9 19.5
Adjustments for assumed changes in policyholder liabilities, pre-tax 9.6 16.9 (10.8)
Other comprehensive income (loss), pre-tax (64.8) 24.7 30.2
Other comprehensive income (loss) before reclassifications, tax 16.0 (7.6) (20.4)
Reclassification from accumulated other comprehensive income, tax 10.8 5.4 12.5
Adjustments for assumed changes in amortization patterns, tax (1.3) (1.0) (6.9)
Adjustments for assumed changes in policyholder liabilities, tax (3.3) (6.0) 3.8
Other comprehensive income (loss), tax 22.2 (9.2) (11.0)
Other comprehensive income (loss) before reclassifications, after-tax (30.7) 25.0 38.0
Reclassification from accumulated other comprehensive income, after-tax (20.8) (22.3) (24.4)
Adjustments for assumed changes in amortization patterns, after-tax 2.6 1.9 12.6
Adjustments for assumed changes in policyholder liabilities, after-tax 6.3 10.9 (7.0)
Other comprehensive income (loss) (42.6) 15.5 19.2
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 174.2 75.6 (543.6)
Other comprehensive income (loss) before reclassifications, tax 4.7    
Other comprehensive income (loss), tax 4.7 (7.5) 72.0
Other comprehensive income (loss) before reclassifications, after-tax 176.3    
Reclassification from accumulated other comprehensive income, after-tax 2.6    
Other comprehensive income (loss) 178.9 68.1 (471.6)
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 24.0 20.2 (142.5)
Other comprehensive income (loss), pre-tax 55.1 69.3 (61.3)
Other comprehensive income (loss) before reclassifications, tax (3.8) (6.8) 55.5
Reclassification from accumulated other comprehensive income, tax (14.0) (20.7) (33.3)
Other comprehensive income (loss), tax (17.8) (27.5) 22.2
Other comprehensive income (loss) before reclassifications, after-tax 20.2 13.4 (87.0)
Reclassification from accumulated other comprehensive income, after-tax 17.1 28.4 47.9
Other comprehensive income (loss) 37.3 41.8 (39.1)
Unrecognized postretirement benefit obligation including NCI | Operating expense      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-tax $ 31.1 $ 49.1 $ 81.2