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Segment Information Operating Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 26,839.0 | $ 23,441.4 | $ 20,853.8
Pretax Profit (Loss) | 2,138.9 | 1,470.7 | 1,911.6
Personal Lines Segment | Agency Channel | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 11,177.6 | 9,791.7 | 9,108.6
Pretax Profit (Loss) | 839.6 | 492.8 | 713.2
Personal Lines Segment | Direct Channel | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 10,769.6 | 9,396.5 | 8,185.9
Pretax Profit (Loss) | 683.7 | 412.2 | 403.4
Operating Segments | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 25,729.9 | 22,474.0 | 19,899.1
Pretax Profit (Loss) | 1,686.9 | 1,091.1 | 1,495.2
Operating Segments | Personal Lines Segment | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 21,947.2 | 19,188.2 | 17,294.5
Pretax Profit (Loss) | 1,523.3 | 905.0 | 1,116.6
Operating Segments | Commercial Lines Segment | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,793.9 | 2,421.3 | 1,995.9
Pretax Profit (Loss) | 214.1 | 155.2 | 318.3
Operating Segments | Property Segment | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 988.8 | 864.5 | 609.1
Pretax Profit (Loss) | (50.3) | 32.5 | 61.3
Operating Segments | Other Indemnity | Underwriting Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0.0 | 0.0 | (0.4)
Pretax Profit (Loss) | (0.2) | (1.6) | (1.0)
Segment Reconciling Items | Fees And Other Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 370.6 | 332.5 | 302.0
Segment Reconciling Items | Service Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 126.8 | 103.3 | 86.3
Pretax Profit (Loss) | 17.3 | 11.3 | 8.8
Segment Reconciling Items | Investments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 612.7 | 530.0 | 567.3
Pretax Profit (Loss) | 588.8 | 507.6 | 544.5
Segment Reconciling Items | Other gains (losses) |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (1.0) | 1.6 | (0.9)
Pretax Profit (Loss) | (1.0) | 1.6 | (0.9)
Segment Reconciling Items | Interest Expense |  |  |
Segment Reporting Information [Line Items] |  |  |
Pretax Profit (Loss) | $ (153.1) | $ (140.9) | $ (136.0)

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