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Municipal Bond Guarantee - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - BAM - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]    
January 1, 2023 - March 31, 2023 $ 7.0  
April 1, 2023 - June 30, 2023 7.0  
July 1, 2023 - September 30, 2023 6.8  
October 1, 2023 - December 31, 2023 6.7  
Total 2021 27.5  
2024 25.9  
2025 24.2  
2026 22.6  
2027 21.0  
2028 and thereafter 177.1  
Total gross unearned insurance premiums $ 298.3 $ 266.3