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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ (28.3) | $ 55.8
Specialty Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (31.3) | 19.6
Personal Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (17.2) | 5.6
Homeowners |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | 3.0 | 13.6
Other Personal Lines |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | 2.8 | 5.0
Commercial Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ 14.4 | $ 11.1

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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