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Acquisition of Business - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 02, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,114.0 | $ 1,112.4 |
Infinity Property and Casualty Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Investments |  |  | $ 1,569.3
Short-term Investments at Cost which Approximates Fair Value Investments |  |  | 98.8
Cash |  |  | 4.0
Receivables from Policyholders |  |  | 583.4
Other Receivables |  |  | 31.7
Value of Intangible Assets Acquired (Reported in Other Assets) |  |  | 262.7
Current Income Tax Assets |  |  | 1.0
Goodwill | $ 1.6 |  | 791.0
Other Assets |  |  | 102.1
Property and Casualty Insurance Reserves |  |  | (717.2)
Unearned Premiums |  |  | (715.6)
Debt |  |  | (282.1)
Deferred Income Tax Liabilities |  |  | (10.8)
Accrued Expenses and Other Liabilities |  |  | (169.6)
Total Purchase Price |  |  | $ 1,548.7

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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