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Municipal Bond Guarantee Insurance - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - BAM - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Guarantor Obligations [Line Items]    
April 1, 2023 - December 31, 2023 $ 20.9  
January 1, 2024 - March 31, 2024 6.8  
April 1, 2024 - June 30, 2024 6.7  
July 1, 2024 - September 30, 2024 6.5  
October 1, 2024 - December 31, 2024 6.4  
Total 2024 26.4  
2025 24.7  
2026 23.1  
2027 21.5  
2028 19.8  
2029 and thereafter 163.4  
Total gross unearned insurance premiums $ 299.8 $ 298.3