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Liability for Unpaid Claims and CAE Liability for Unpaid Claims and Claim Adjustment Expenses (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense    
Balance at January 1 $ 23,222.0 $ 23,249.5
Less Reinsurance Recoverable 2,182.0 2,163.6
Net Balance at January 1 21,040.0 21,085.9
Incurred Related to    
Current Year 2,943.0 2,772.2
Total Incurred 3,219.5 3,269.7
Paid Related to    
Current Year (904.3) (816.2)
Prior Years (2,498.4) (2,475.8)
Total Paid (3,402.7) (3,292.0)
Net Balance at June 30 20,856.8 21,063.6
Plus Reinsurance Recoverable 2,188.4 2,146.6
Balance at June 30 23,045.2 23,210.2
Amount Related to Interest    
Incurred Related to    
Prior Years 552.1 571.0
Incurred Claims    
Incurred Related to    
Prior Years (230.9) (170.6)
Foreign Currency    
Incurred Related to    
Prior Years $ (44.7) $ 97.1