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Municipal Bond Guarantee (Tables)
 9 Months Ended
Sep. 30, 2017
Guarantees [Abstract]  
Schedule of Municipal Bond Guarantee Insured Obligations
The following table provides a schedule of BAM’s insured obligations:
 
 
September 30, 2017
 
December 31, 2016
Contracts outstanding
 
5,907

 
4,807

Remaining weighted average contract period outstanding (in years)
 
10.9

 
10.8

Contractual debt service outstanding (in millions):
 
 
 
 
  Principal
 
$
39,207.5

 
$
33,057.3

  Interest
 
19,681.0

 
16,396.6

  Total debt service outstanding
 
$
58,888.5

 
$
49,453.9

 
 
 
 
 
Gross unearned insurance premiums
 
$
118.5

 
$
82.9
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Table Text Block]
The following table is a schedule of BAM’s future premium revenues as of September 30, 2017:
Millions
 
September 30, 2017
October 1, 2017 - December 31, 2017
 
$
2.5

 
 
 
January 1, 2018 - March 31, 2018
 
2.5

April 1, 2018 - June 30, 2018
 
2.5

July 1, 2018 - September 30, 2018
 
2.5

October 1, 2018 - December 31, 2018
 
2.4

 
 
9.9

 
 
 
2019
 
9.5

2020
 
9.2

2021
 
8.7

2022 and thereafter
 
78.7

Total gross unearned insurance premiums
 
$
118.5