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Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 6,624,408 $ 6,836,439
Other comprehensive income (loss) 126,016 61,958
Amounts reclassified from AOCI to the Unaudited Interim Condensed Consolidated Statements of Operations (32,308) (3,164)
Disposal Group, Including Discontinued Operation, Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 94,593  
OCI, net of tax (note 14) 93,708 58,794
OCI attributable to the non-controlling interests (4,617) (1,017)
Net current period OCI attributable to shareholders of AQN 89,091 57,777
Ending Balance 6,176,273 6,624,408
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (102,286) (160,063)
OCI, net of tax (note 14) 89,091 57,777
Ending Balance 81,398 (102,286)
Foreign currency cumulative translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (104,870) (98,467)
Other comprehensive income (loss) 33,821 (3,788)
Amounts reclassified from AOCI to the Unaudited Interim Condensed Consolidated Statements of Operations 626 (1,598)
Disposal Group, Including Discontinued Operation, Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 0  
OCI, net of tax (note 14) 34,447 (5,386)
OCI attributable to the non-controlling interests (4,617) (1,017)
Net current period OCI attributable to shareholders of AQN 29,830 (6,403)
Ending Balance (75,040) (104,870)
Unrealized gain (loss) on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (38,322) (97,809)
Other comprehensive income (loss) 79,381 57,351
Amounts reclassified from AOCI to the Unaudited Interim Condensed Consolidated Statements of Operations (27,130) 2,136
Disposal Group, Including Discontinued Operation, Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 94,593  
OCI, net of tax (note 14) 52,251 59,487
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN 52,251 59,487
Ending Balance 108,522 (38,322)
Pension and post-employment actuarial changes    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 40,906 36,213
Other comprehensive income (loss) 12,814 8,395
Amounts reclassified from AOCI to the Unaudited Interim Condensed Consolidated Statements of Operations (5,804) (3,702)
Disposal Group, Including Discontinued Operation, Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 0  
OCI, net of tax (note 14) 7,010 4,693
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN 7,010 4,693
Ending Balance $ 47,916 $ 40,906