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Liability for Unpaid Claims and Claims Adjustment Expense (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense    
Balance at January 1 $ 23,076.7 $ 23,149.0
Less Reinsurance Recoverable 2,246.8 2,227.3
Net Balance at January 1 20,829.9 20,921.7
Incurred Related to    
Current Year 3,187.2 3,101.9
Paid Related to    
Current Year (1,015.9) (973.4)
Prior Years (2,546.6) (2,542.1)
Total Paid (3,562.5) (3,515.5)
Net Balance at June 30 20,582.4 20,842.9
Plus Reinsurance Recoverable 2,260.2 2,247.7
Balance at June 30 22,842.6 23,090.6
Amount Related to Interest    
Incurred Related to    
Prior Years 528.5 545.5
Incurred Claims    
Incurred Related to    
Prior Years (270.5) (202.2)
Foreign Currency    
Incurred Related to    
Prior Years (130.2) (8.5)
Operating Expense    
Incurred Related to    
Total Incurred $ 3,315.0 $ 3,436.7