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Liability for Unpaid Claims and Claims Adjustment Expenses Liability for Unpaid Claims and Claim Adjustment Expenses (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense    
Balance at January 1 $ 23,149.0 $ 23,222.0
Less Reinsurance Recoverable 2,227.3 2,182.0
Net Balance at January 1 20,921.7 21,040.0
Incurred Related to    
Current Year 4,588.9 4,421.9
Total Incurred 5,086.4 5,093.3
Paid Related to    
Current Year (1,721.3) (1,589.1)
Prior Years (3,570.6) (3,491.2)
Total Paid (5,291.9) (5,080.3)
Net Balance at September 30 20,716.2 21,053.0
Plus Reinsurance Recoverable 2,241.8 2,204.0
Balance at September 30 22,958.0 23,257.0
Amount Related to Interest    
Incurred Related to    
Prior Years 793.9 807.2
Incurred Claims    
Incurred Related to    
Prior Years (228.1) (65.6)
Foreign Currency    
Incurred Related to    
Prior Years $ (68.3) $ (70.2)