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Liability for Unpaid Claims and Claims Adjustment Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense      
Balance at January 1 $ 23,222.0 $ 23,249.5 $ 23,796.1
Less Reinsurance Recoverable 2,182.0 2,163.6 2,064.6
Net Balance at January 1 21,040.0 21,085.9 21,731.5
Incurred Related to      
Current Year 5,832.3 5,422.9 5,243.0
Paid Related to      
Current Year (2,354.7) (2,156.9) (2,035.4)
Prior Years (4,428.8) (4,410.9) (4,451.4)
Total Paid (6,783.5) (6,567.8) (6,486.8)
Net Balance at December 31 20,921.7 21,040.0 21,085.9
Plus Reinsurance Recoverable 2,227.3 2,182.0 2,163.6
Balance at December 31 23,149.0 23,222.0 23,249.5
Amount Related to Interest      
Incurred Related to      
Prior Years 1,049.8 1,089.7 1,136.7
Incurred Claims      
Incurred Related to      
Prior Years (106.2) (158.2) (198.3)
Foreign Currency      
Incurred Related to      
Prior Years (110.7) 167.5 (340.2)
Operating Expense      
Incurred Related to      
Total Incurred $ 6,665.2 $ 6,521.9 $ 5,841.2