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Acquisition of Business - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Apr. 01, 2021
Business Acquisition [Line Items]      
Goodwill $ 1,300.3 $ 1,312.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     $ 370.9
Property and Casualty Insurance Reserves      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (211.1)
Unearned Premium      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (177.8)
Deferred Income Tax Liabilities      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (7.8)
Other Liabilities      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (51.0)
Interest on Fixed Income Securities      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     151.2
Dividends on Equity Securities Excluding Alternative Investments      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     82.4
Short-term Investments      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     100.1
Cash      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     54.3
Premiums Receivable      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     148.9
Receivables Other than Premium Receivable      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     2.0
Goodwill      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     198.0
Current Income Tax Asset      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     0.3
Other Assets      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     $ 81.4