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Acquisition of Business - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Apr. 01, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 1,312.0   $ 1,114.0
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