XML 113 R85.htm IDEA: XBRL DOCUMENT v3.8.0.1
Significant Events - Investment in and Acquisition by TransAlta Renewables of the Canadian Assets (Details)
Nov. 09, 2017
CAD
Jan. 06, 2016
CAD
shares
CAD / shares
MW
Dec. 31, 2016
shares
Nov. 30, 2016
CAD
Mar. 17, 2016
shares
Dec. 31, 2015
shares
Disclosure of detailed information about business combination [line items]            
Number of shares issued | shares     38,600,000   1,824,620.00 38,600,000
Transfer of equity from non-controlling interests       CAD 38,000,000    
TransAlta Renewables | Canadian Assets            
Disclosure of detailed information about business combination [line items]            
Aggregate value of business combination   CAD 540,000,000   520,000,000    
Capacity of facility (in megawatts) | MW   611        
Cash paid   CAD 173,000,000        
Common shares issued (in shares) | shares   15,640,583        
Value of common shares issued   CAD 152,000,000        
Subscription receipts (in shares) | shares   17,692,750        
Price per subscription receipt   CAD 9.75        
Number of shares received per subscription receipt (in shares) | shares   1        
Dividend per subscription receipt (in CAD per share) | CAD / shares   CAD 0.07        
Number of shares issued | shares   17,692,750        
Dividends paid, ordinary shares   CAD 1,000,000        
Share issue related cost   8,000,000        
Effect of share issuance cost on income cost   2,000,000        
Working capital and certain capital spares acquired       CAD 19,000,000    
Convertible unsecured debenture | TransAlta Renewables | Canadian Assets            
Disclosure of detailed information about business combination [line items]            
Convertible senior subordinated debenture issued   CAD 215,000,000        
Repayments of bonds, notes and debentures CAD 218,000,000          
Payment of accrued interest CAD 3,000,000