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Liability for Unpaid Claims and Claims Adjustment Expense (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 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 1,605.9 1,556.8
Paid Related to    
Current Year (368.0) (328.7)
Prior Years (1,453.7) (1,439.5)
Total Paid (1,821.7) (1,768.2)
Net Balance at March 31 20,631.7 20,901.1
Plus Reinsurance Recoverable 2,260.7 2,241.0
Balance at March 31 22,892.4 23,142.1
Amount Related to Interest    
Incurred Related to    
Prior Years 271.9 280.0
Incurred Claims    
Incurred Related to    
Prior Years (126.7) (130.3)
Foreign Currency    
Incurred Related to    
Prior Years (127.6) 41.1
Operating Expense    
Incurred Related to    
Total Incurred $ 1,623.5 $ 1,747.6