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Segment Information Operating Results (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenues $ 47,702.0 $ 42,658.1 $ 39,022.3
Pretax Profit (Loss) 4,210.0 7,173.2 5,160.3
Amortization of intangible assets 57.7 56.9 66.3
Personal Lines Segment | Agency Channel | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 16,881.0 15,789.5 14,904.1
Pretax Profit (Loss) 992.1 2,236.5 1,673.2
Personal Lines Segment | Direct Channel | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 18,492.3 16,830.6 15,305.9
Pretax Profit (Loss) 619.2 2,076.5 1,181.4
Operating Segments | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 44,368.7 39,261.6 36,192.4
Pretax Profit (Loss) 2,065.4 4,822.7 3,287.3
Operating Segments | Personal Lines Segment | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 35,373.3 32,620.1 30,210.0
Pretax Profit (Loss) $ 1,611.3 $ 4,313.0 $ 2,854.6
Personal auto insurance percentage of the total personal lines segment net premiums earned 94.00% 94.00% 94.00%
Operating Segments | Commercial Lines Segment | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues $ 6,945.2 $ 4,875.8 $ 4,427.6
Pretax Profit (Loss) 767.8 634.8 458.8
Operating Segments | Property Segment | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 2,042.5 1,765.7 1,554.8
Pretax Profit (Loss) (312.3) (125.1) (26.1)
Amortization of intangible assets 56.6 56.9 66.3
Operating Segments | Other Indemnity | Underwriting Operations      
Segment Reporting Information [Line Items]      
Revenues 7.7 0.0 0.0
Pretax Profit (Loss) (1.4) 0.0 0.0
Segment Reconciling Items | Investments      
Segment Reporting Information [Line Items]      
Revenues 2,370.1 2,566.6 2,071.2
Pretax Profit (Loss) 2,344.6 2,546.6 2,046.6
Segment Reconciling Items | Interest Expense      
Segment Reporting Information [Line Items]      
Pretax Profit (Loss) (218.6) (217.0) (189.7)
Segment Reconciling Items | Fees And Other Revenues      
Segment Reporting Information [Line Items]      
Revenues 691.8 603.5 563.7
Segment Reconciling Items | Service Businesses      
Segment Reporting Information [Line Items]      
Revenues 271.4 226.4 195.0
Pretax Profit (Loss) $ 18.6 $ 20.9 $ 16.1