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Investments in Unconsolidated Affiliates - Activity Related to Partnership's Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period $ 738.7    
Equity earnings (loss) 72.6 $ 39.0 $ 7.3
Balance at end of period 714.0 738.7  
Targa Resources Partners LP [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 738.7 490.5 221.6
Equity earnings (loss) 72.6 39.0 7.3
Cash Distributions (100.0) (53.1) (34.3) [1]
Acquisition (Disposition)   (4.5) 1.4
Contributions 2.7 266.8 294.5 [2]
Balance at end of period 714.0 738.7 490.5
Targa Resources Partners LP [Member] | Gulf Coast Fractionators LP [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 37.2 [3] 40.3 45.8
Equity earnings (loss) 2.9 [3] 16.1 16.8
Cash Distributions (1.6) [3] (19.2) (22.3) [1]
Balance at end of period 38.5 [3] 37.2 [3] 40.3
Targa Resources Partners LP [Member] | T2 LaSalle [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 44.8 [4] 49.3 54.1
Equity earnings (loss) (4.8) [4] (4.5) (4.9)
Cash Distributions [4] (0.4)    
Contributions [2]     0.1
Balance at end of period 39.6 [4] 44.8 [4] 49.3
Targa Resources Partners LP [Member] | T2 Eagle Ford [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 89.6 [4] 99.0 109.2
Equity earnings (loss) (8.9) [4] (9.4) (10.2)
Cash Distributions [4] (0.9)    
Balance at end of period 79.8 [4] 89.6 [4] 99.0
Targa Resources Partners LP [Member] | T2 EF Cogen [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period     3.9
Equity earnings (loss)     (1.8)
Acquisition (Disposition)     (2.1)
Targa Resources Partners LP [Member] | Cayenne Joint Venture [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 15.9 16.6 8.6
Equity earnings (loss) 6.3 7.2 6.4
Cash Distributions (6.0) (8.2) (4.0) [1]
Contributions   0.3 5.6 [2]
Balance at end of period 16.2 15.9 16.6
Targa Resources Partners LP [Member] | GCX [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period [5] 447.5 211.6  
Equity earnings (loss) [5] 66.3 27.7 0.8
Cash Distributions [5] (81.3) (25.3)  
Contributions [5] 2.7 233.5 210.8 [2]
Balance at end of period [5] 435.2 447.5 211.6
Targa Resources Partners LP [Member] | Little Missouri 4 [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period 103.7 67.3  
Equity earnings (loss) 10.8 3.4  
Cash Distributions (9.8)   (8.0) [1]
Contributions   33.0 75.3 [2]
Balance at end of period $ 104.7 103.7 67.3
Targa Resources Partners LP [Member] | Agua Blanca [Member]      
Schedule Of Equity Method Investments [Line Items]      
Balance at beginning of period   6.4  
Equity earnings (loss)   (1.5) 0.2
Cash Distributions   (0.4)  
Acquisition (Disposition)   $ (4.5) 3.5
Contributions [2]     2.7
Balance at end of period     $ 6.4
[1] Includes an $8.0 million distribution from Little Missouri 4 as a reimbursement of pre-formation expenditures
[2] Includes a $16.0 million initial contribution of property, plant and equipment to Little Missouri 4
[3] Targa will assume operatorship of GCF in the first half of 2021.
[4] The carrying values of the T2 Joint Ventures include the effects of the Atlas Merger purchase accounting, which determined fair values for the joint ventures as of the date of acquisition. As of December 31, 2020, $21.6 million of unamortized excess fair value over the T2 LaSalle and T2 Eagle Ford capital accounts remained. These basis differences, which are attributable to the underlying depreciable tangible gathering assets, are being amortized on a straight-line basis as components of equity earnings over the estimated 20-year useful lives of the underlying assets.
[5] As discussed in Note 4 –Joint Ventures and Divestitures, our 25% interest in GCX is owned by GCX DevCo JV, of which we own a 20% interest. GCX DevCo JV is accounted for on a consolidated basis in our consolidated financial statements.