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Debt Commitments (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Debt Obligations and Letters of Credit Outstanding
Debt obligations and letters of credit outstanding at the end of each period consisted of the following:
 
Average Interest Rate at June 30, 2020
 
 
 
Debt Outstanding
 
 
Maturity
Date
 
June 30,
2020
 
December 31, 2019
Unsecured revolving credit facility
1.10
%
 
November 30, 2023
 
$

 
210.0

Senior unsecured promissory notes payable, Series A
2.00
%
 
July 20, 2021
 
40.0

 
40.0

Senior unsecured promissory notes payable, Series B
2.45
%
 
July 20, 2022
 
35.0

 
35.0

Senior unsecured promissory notes payable, Series C
3.22
%
 
March 1, 2024
 
60.0

 
60.0

Senior unsecured promissory notes payable, Series D
2.66
%
 
May 15, 2025
 
75.0

 

Senior unsecured promissory notes payable, Series E
2.72
%
 
May 15, 2027
 
50.0

 

Senior unsecured promissory notes payable, Series F
1.69
%
 
June 24, 2023
 
70.0

 

Senior unsecured promissory notes payable, Series G
2.13
%
 
June 24, 2026
 
25.0

 

Senior unsecured promissory notes payable, Series H
2.50
%
 
June 24, 2030
 
50.0

 

Total
 
 
 
 
405.0

 
345.0

   Less: Current portion of debt
 
 
 
 

 
(3.0
)
Long-term debt
 
 
 
 
$
405.0

 
342.0

 
 
 
 
 
 
 
 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation
 
 
 
 
$
36.3

 
36.3