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Municipal Bond Guarantee Insurance - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - BAM - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]    
October 1, 2021 - December 31, 2021 $ 6.2  
January 1, 2022 - March 31, 2022 6.1  
April 1, 2022 - June 30, 2022 6.1  
July 1, 2022 - September 30, 2022 6.0  
October 1, 2022 - December 31, 2022 5.9  
Total 2022 24.1  
2023 22.8  
2024 21.1  
2025 19.6  
2026 18.1  
2027 and thereafter 145.1  
Total gross unearned insurance premiums $ 257.0 $ 237.5