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Municipal Bond Guarantee Insurance - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - BAM - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]    
July 1, 2022 - December 31, 2022 $ 13.0  
January 1, 2023 - March 31, 2023 6.4  
April 1, 2023 - June 30, 2023 6.3  
July 1, 2023 - September 30, 2023 6.2  
October 1, 2023 - December 31, 2023 6.1  
Total 25.0  
2024 23.5  
2025 21.8  
2026 20.3  
2027 18.9  
2028 and thereafter 151.5  
Total gross unearned insurance premiums $ 274.0 $ 266.3