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Municipal Bond Guarantee Insurance (Tables)
 3 Months Ended
Mar. 31, 2021
Guarantees [Abstract]  
Schedule of Municipal Bond Guarantee Insured Obligations
The following table presents a schedule of BAM’s insured obligations as of March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
Contracts outstanding11,252 10,997 
Remaining weighted average contract period outstanding (in years)10.610.7
Contractual debt service outstanding (in millions):
Principal $77,689.3 $75,287.7 
Interest36,710.5 36,448.8 
Total debt service outstanding$114,399.8 $111,736.5 
Gross unearned insurance premiums (in millions)$243.7 $237.5 
Financial Guarantee Insurance Contracts, Premium Received over Contract Period
The following table presents a schedule of BAM’s future premium revenues as of March 31, 2021:
MillionsMarch 31, 2021
April 1, 2021 - December 31, 2021$17.6 
January 1, 2022 - March 31, 20225.7 
April 1, 2022 - June 30, 20225.6 
July 1, 2022 - September 30, 20225.6 
October 1, 2022 - December 31, 20225.4 
     Total 202222.3 
202321.0 
202419.4 
202518.0 
202616.6 
2027 and thereafter128.8 
Total gross unearned insurance premiums$243.7 
Schedule of Net Written Premiums
The following table presents a schedule of written premiums and earned premiums included in White Mountains’s HG Global/BAM segment for the three months ended March 31, 2021 and 2020:
Three Months Ended March 31,
Millions20212020
Written premiums:
Direct$8.0 $9.7 
Assumed4.5 — 
Gross written premiums$12.5 $9.7 
Earned premiums:
Direct$5.3 $4.5 
Assumed1.1 .9 
Gross earned premiums$6.4 $5.4