|
Preferred shares issued by a subsidiary company (Details) (Subsidiary company)
In Millions, except Per Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
Series 2 Shares
CAD
|
Dec. 31, 2009
Series 2 Shares
CAD
|
Dec. 31, 2012
Series 2 Shares
December 31, 2014 and every five years thereafter
CAD
|
Dec. 31, 2012
Series 3 Shares
|
Dec. 31, 2012
Series 1 Shares
CAD
|
Dec. 31, 2007
Series 1 Shares
CAD
|
Dec. 31, 2007
Series 1 Shares
On or after June 30, 2012
CAD
|
Dec. 31, 2007
Series 1 Shares
After June 30, 2016
CAD
|
Dec. 31, 2012
Series 1 Shares and Series 2 Shares
USD ($)
|
Dec. 31, 2011
Series 1 Shares and Series 2 Shares
USD ($)
|
|
| Preferred shares issued by subsidiary company | ||||||||||
| Number of preferred shares issued | 4.0 | 5.0 | ||||||||
| Dividend rate on preferred shares (as a percent) | 7.00% | 4.85% | ||||||||
| Issue price of preferred shares (in Canadian dollars per share) | 25.00 | 25.00 | ||||||||
| Dividend per share per annum (in Canadian dollars per share) | 1.75 | 1.2125 | ||||||||
| Redemption price after specified date and thereafter (in Canadian dollars per share) | 25.00 | 26.00 | 25.00 | |||||||
| Decline in redemption price per year (in Canadian dollars per share) | 0.25 | |||||||||
| Initial period for declaration of dividend | 5 years | |||||||||
| Period for declaration of dividend at reset rate | 5 years | |||||||||
| Reference rate for dividend | Five-year Government of Canada bond yield | 90-day Government of Canada treasury bill rate | ||||||||
| Percentage points added to the reference rate | 4.18% | 4.18% | ||||||||
| Frequency for redemption after December 31, 2014 | 5 years | |||||||||
| Dividend paid | $ 13.0 | $ 3.2 | ||||||||