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Preferred Stock - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2016
Tranche
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Class Of Stock [Line Items]          
Number of tranches sold to investors | Tranche   2      
Term of preferred stock warrants     7 years    
Accounting Conversion Price Of Convertible Preferred Stock | $ / shares     $ 17.02    
Conversion price of preferred stock into common stock | $ / shares     $ 20.77    
Preferred Series A dividends payable $ 22,900,000   $ 22,900,000    
Preferred stock dividend paid     $ 92,700,000 $ 91,700,000 $ 91,700,000
Accrued preferred dividends payable date     Feb. 12, 2021    
Deemed dividends on Series A Preferred Stock     $ 39,200,000 $ 33,100,000 29,200,000
Preferred stock dividend per share | $ / shares     $ 23.75    
Net carrying value of shares repurchased     $ 91,500,000    
Series A Warrants [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares issued to investors | shares 13,550,004   13,550,004    
Exercise price of warrants | $ / shares $ 18.88   $ 18.88    
Series B Warrants [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares issued to investors | shares 6,533,727   6,533,727    
Exercise price of warrants | $ / shares $ 25.11   $ 25.11    
Series A Preferred Stock [Member]          
Class Of Stock [Line Items]          
Preferred stock, liquidation per share | $ / shares $ 1,000   $ 1,000 $ 1,000  
Preferred stock, percentage of dividend     9.50%    
Preferred stock dividend payment terms     fixed dividend payable quarterly 45 days after the end of each fiscal quarter    
Preferred stock redemption premium percentage in sixth year     10.00%    
Preferred stock redemption premium percentage in sixth year and thereafter     5.00%    
Preferred stock redemption premium percentage in twelfth year     10.00%    
Volume Weighted Average Share Price | $ / shares     $ 18.88    
Preferred stock redemption premium percentage in twelfth year and thereafter     120.00%    
Stock conversion, description     If the investors do not elect to convert their Series A Preferred into TRC common stock, Targa has a right after year twelve to force conversion, but only if the VWAP for the ten preceding trading days is greater than 120% of the conversion price    
Preferred stock premium change in year four through six     10.00%    
Preferred stock premium change in year six and thereafter     5.00%    
Maximum number of common share would be issued upon conversion of preferred share | shares     44,260,953    
Preferred stock, shares issued to investors | shares 919,300   919,300 965,100  
Deemed dividends on Series A Preferred Stock [1]     $ 39,200,000 $ 33,100,000 $ 29,200,000
Repurchases of common stock (in shares) | shares 45,800        
Preferred Stock, redemption price | $ / shares $ 1,100   $ 1,100    
Preferred Stock, liquidation preference multiplied percentage 110.00%   110.00%    
Unpaid dividends $ 1,100,000        
Net carrying value of shares repurchased 2,700,000        
Series A Preferred Stock [Member] | 10% Redemption Premium          
Class Of Stock [Line Items]          
Preferred stock conversion redemption premium percentage in sixth year     10.00%    
Benefit from conversion right by redemption premium     $ 91,900,000    
Series A Preferred Stock [Member] | 5% Redemption Premium          
Class Of Stock [Line Items]          
Benefit from conversion right by redemption premium     $ 46,000,000.0    
Preferred stock conversion redemption premium percentage in year seven through twelve year     5.00%    
Series A Preferred Stock [Member] | Maximum [Member]          
Class Of Stock [Line Items]          
Incurrence of indebtedness other than stipulated fixed charge coverage $ 2,750,000,000   $ 2,750,000,000    
[1] Includes $1.6 million attributable to the partial repurchase of Series A Preferred Stock in December 2020. Refer to Note 11 – Preferred Stock.