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SCHEDULE III - Supplementary Insurance Information Supplementary Insurance Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred policy acquisition costs $ 1,355.6 $ 1,237.2 $ 1,056.5
Future policy benefits, losses, claims, and loss expenses 26,164.1 20,265.8 18,105.4
Unearned premiums 15,615.8 13,437.5 12,388.8
Other policy claims and benefits payable 0.0 0.0 0.0
Premium revenue 44,368.7 39,261.6 36,192.4
Net investment income 835.4 916.6 1,017.4
Benefits, claims, losses, and settlement expenses 33,627.6 25,121.8 25,470.5
Amortization of deferred policy acquisition costs 3,712.8 3,273.2 3,023.2
Other operating expenses 5,654.7 6,647.4 4,975.1
Net premiums written 46,405.2 40,568.7 37,577.9
Policyholder credit expense 0.0 1,077.4 0.0
Personal Lines Segment      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Premium revenue 35,373.3 32,620.1 30,210.0
Benefits, claims, losses, and settlement expenses 27,043.1 20,611.7 21,329.7
Amortization of deferred policy acquisition costs 2,614.7 2,437.3 2,273.6
Other operating expenses 4,656.8 5,762.0 4,227.6
Net premiums written 36,168.8 33,342.6 31,102.2
Commercial Lines Segment      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Premium revenue 6,945.2 4,875.8 4,427.6
Benefits, claims, losses, and settlement expenses 4,814.5 3,146.0 3,034.8
Amortization of deferred policy acquisition costs 734.1 525.7 481.2
Other operating expenses 742.3 647.5 523.5
Net premiums written 8,015.9 5,315.3 4,791.8
Property Segment      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Premium revenue 2,042.5 1,765.7 1,554.8
Benefits, claims, losses, and settlement expenses 1,764.6 1,364.1 1,106.0
Amortization of deferred policy acquisition costs 362.9 310.2 268.4
Other operating expenses 253.0 237.9 224.0
Net premiums written 2,216.2 1,910.8 1,683.9
Other Indemnity      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Premium revenue 7.7 0.0 0.0
Benefits, claims, losses, and settlement expenses 5.4 0.0 0.0
Amortization of deferred policy acquisition costs 1.1 0.0 0.0
Other operating expenses 2.6 0.0 0.0
Net premiums written $ 4.3 $ 0.0 $ 0.0