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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, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]    
April 1, 2021 - December 31, 2021 $ 17.6  
January 1, 2022 - March 31, 2022 5.7  
April 1, 2022 - June 30, 2022 5.6  
July 1, 2022 - September 30, 2022 5.6  
October 1, 2022 - December 31, 2022 5.4  
Total 2022 22.3  
2023 21.0  
2024 19.4  
2025 18.0  
2026 16.6  
2027 and thereafter 128.8  
Total gross unearned insurance premiums $ 243.7 $ 237.5