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Long-term debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Long Term Debt
Long-term debt consists of the following:
Borrowing type
 
Weighted average coupon
 
Maturity
 
Par value
 
June 30, 2019
 
December 31, 2018
Senior unsecured revolving credit facilities (a)
 

 
2019-2023
 
N/A

 
$
145,290

 
$
97,000

Senior unsecured bank credit facilities (b)
 

 
2019-2020
 
N/A

 
135,000

 
321,807

Commercial paper (c)
 

 
2023
 
N/A

 
1,250

 
6,000

U.S. dollar borrowings
 
 
 
 
 
 
 
 
 
 
Senior unsecured notes
 
4.09
%
 
2020-2047
 
$
1,225,000

 
1,219,124

 
1,218,680

Senior unsecured utility notes
 
5.99
%
 
2020-2035
 
$
222,000

 
239,476

 
240,161

Senior secured utility bonds
 
4.75
%
 
2020-2044
 
$
662,500

 
674,517

 
676,697

Subordinated unsecured notes (d)
 
6.5
%
 
2078-2079
 
637,500

 
621,458

 
278,771

Canadian dollar borrowings
 
 
 
 
 
 
 
 
 
 
Senior unsecured notes (e)
 
4.48
%
 
2020-2029
 
C$
950,669

 
722,901

 
474,764

Senior secured project notes
 
10.24
%
 
2020-2027
 
C$
29,956

 
22,890

 
22,915

 
 
 
 
 
 
 
 
$
3,781,906

 
$
3,336,795

Less: current portion
 
 
 
 
 
 
 
(8,429
)
 
(13,048
)
 
 
 
 
 
 
 
 
$
3,773,477

 
$
3,323,747