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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ (0.9) | $ 21.4
Specialty Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (18.0) | 14.3
Personal Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | (2.1) | 1.3
Homeowners |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | 5.0 |
Other Personal Lines |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | 1.8 | 1.8
Commercial Automobile |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Incurred Losses and LAE Related to Prior Years | $ 12.5 | $ 3.8

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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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