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Capital Stock - Additional Information, Stock-based compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares) 0 507,000 1,490,000
Weighted-average grant-date fair value of options granted (in dollars per share) $ 0 $ 2.55 $ 1.16
Common stock conversion (in shares) 1    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years 6 months    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 3.6 $ 3.5 $ 0.1
Non-Management Directors | Teekay Tankers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 0.4 $ 0.3 0.3
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares reserved for issuance upon exercise of options or equity awards granted or to be granted 10,254,117 11,324,227  
Stock options granted (in shares) 0 506,579  
Stock option, term (in years) 10 years    
Vesting period (in years) 3 years    
Compensation costs $ 0.0 $ 1.6 $ 1.1
Intrinsic value of outstanding in-the-money stock options $ 7.1 $ 10.5  
Weighted-average remaining life (in years) 4 years 6 months 5 years 6 months  
Weighted-average grant-date fair value of options granted (in dollars per share)   $ 2.55  
Expected volatility used in computing fair value of options granted 41.27%    
Dividend yield used in computing fair value of options granted 0.00%    
Risk-free interest rate used in computing fair value of options granted 3.83%    
Estimated forfeiture rate used in computing fair value of options granted 0.00%    
Stock Options | Teekay Tankers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares) 0    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Common stock conversion (in shares) 1    
Number of shares or units granted equity based compensation awards 273,657 329,735 787,586
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 2.6 $ 1.9 $ 2.3
Vested restricted stock (in shares) 386,305 651,135 631,706
Market value of vested restricted stock $ 1.5 $ 2.0 $ 2.2
Stock granted (in shares) 104,900 149,217 218,671
Share based compensation expense $ 2.6 $ 2.7 $ 2.9
Shares Issued, Shares, Share-Based Payment, Arrangement, Vested and Deferred 44,967    
Restricted Stock Units | Teekay Tankers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation costs $ 0.7 $ 0.3 $ 0.3
Number of shares or units granted equity based compensation awards 70,385 47,330 95,485