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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, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]    
April 1, 2022 - December 31, 2022 $ 19.1  
January 1, 2023 - March 31, 2023 6.2  
April 1, 2023 - June 30, 2023 6.1  
July 1, 2023 - September 30, 2023 6.0  
October 1, 2023 - December 31, 2023 5.9  
Total 24.2  
2024 22.7  
2025 21.1  
2026 19.6  
2027 18.1  
2028 and thereafter 142.5  
Total gross unearned insurance premiums $ 267.3 $ 266.3