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Acquisition of Business - Recognized Identified Assets Acquired and Liabilities Assumed (Details)
$ in Millions
Apr. 01, 2021
USD ($)
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 371.0
Property and Casualty Insurance Reserves [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (211.1)
Unearned Premium [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (177.8)
Deferred Income Tax Liabilities [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (7.7)
Other Liabilities [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (51.0)
Fixed Maturities at Fair Value  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities 151.2
Equity Securities at Fair Value  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities 82.4
Short-term Investments [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities 100.1
Cash [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 54.3
Premiums Receivable [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 148.9
Receivables Other than Premium Receivable [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 2.0
Goodwill [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 197.9
Current Income Tax Asset [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 0.3
Other Assets [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 81.5