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Preferred Stock - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Tranche
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
shares
Class Of Stock [Line Items]            
Number of tranches sold to investors | Tranche     2      
Gross proceeds     $ 994.1   $ 994.1  
Term of preferred stock warrants       7 years    
Net Proceeds- Initial Relative Fair Value Allocation         969.3  
Allocation to BCF       $ 0.0 (614.4)  
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 $ 22.9     $ 22.9   $ 22.9
Preferred stock dividend paid       $ 45.8    
Accrued preferred dividends payable date       Aug. 14, 2017    
Deemed dividends on Series A preferred stock $ 6.3 $ 6.5   $ 12.5 6.5  
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    
Net Proceeds- Initial Relative Fair Value Allocation         135.7  
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    
Net Proceeds- Initial Relative Fair Value Allocation         46.5  
Series A Preferred Stock [Member]            
Class Of Stock [Line Items]            
Preferred stock, shares issued to investors | shares 965,100     965,100   965,100
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    
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 conversion price threshold percentage       120.00%    
Maximum number of common share would be issued upon conversion of preferred share | shares       46,466,057    
Net Proceeds- Initial Relative Fair Value Allocation         787.1  
Preferred stock, discount on shares   $ 178.1     178.1  
Allocation to BCF         $ 614.4  
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       $ 96.5    
Series A Preferred Stock [Member] | 5% Redemption Premium            
Class Of Stock [Line Items]            
Benefit from conversion right by redemption premium       $ 48.3    
Preferred stock conversion redemption premium percentage in year seven through twelve year       5.00%    
Private Placement [Member] | Series A Warrants [Member]            
Class Of Stock [Line Items]            
Conversion of warrant into preferred stock | shares     13,550,004      
Private Placement [Member] | Series B Warrants [Member]            
Class Of Stock [Line Items]            
Conversion of warrant into preferred stock | shares     6,533,727      
Private Placement [Member] | Series A Preferred Stock [Member]            
Class Of Stock [Line Items]            
Preferred stock, shares issued to investors | shares     965,100