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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, 2020
Dec. 31, 2019
Guarantor Obligations [Line Items]    
January 1, 2021 - March 31, 2021 $ 5.6  
April 1, 2021 - June 30, 2021 5.5  
July 1, 2021 - September 30, 2021 5.5  
October 1, 2021 - December 31, 2021 5.4  
Total 2021 22.0  
2022 20.9  
2023 19.8  
2024 18.3  
2025 17.0  
2026 and thereafter 139.5  
Total gross unearned insurance premiums $ 237.5 $ 198.4