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Municipal Bond Guarantee Insurance - Schedule of BAM's Future Expected Premium Revenues (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Total gross unearned insurance premiums $ 136.8 $ 82.9
BAM    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
January 1, 2018 - March 31, 2018 2.9  
April 1, 2018 - June 30, 2018 2.9  
July 1, 2018 - September 30, 2018 2.9  
October 1, 2018 - December 31, 2018 2.8  
Total 11.5  
2019 11.1  
2020 10.7  
2021 10.2  
2022 9.7  
2023 and thereafter 83.6  
Total gross unearned insurance premiums $ 136.8