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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, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]    
January 1, 2022 - March 31, 2022 $ 6.4  
April 1, 2022 - June 30, 2022 6.4  
July 1, 2022 - September 30, 2022 6.3  
October 1, 2022 - December 31, 2022 6.1  
Total 2021 25.2  
2023 23.9  
2024 22.2  
2025 20.6  
2026 19.1  
2027 and thereafter 155.3  
Total gross unearned insurance premiums $ 266.3 $ 237.5