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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Debt Obligations - Debt Repurchases & Extinguishments - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended						12 Months Ended
	May 21, 2024	Aug. 31, 2024	Apr. 30, 2024	Nov. 30, 2023	Jan. 31, 2023	Apr. 30, 2022	Feb. 28, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2022
Debt Instrument [Line Items]
Gain (loss) from financing activities								$ (0.8)	$ (2.1)	$ (49.6)
Gain (loss) due to debt extinguishments	$ 0.8		$ 0.8
Senior Unsecured 5.250% Notes due May 2023 [Member]
Debt Instrument [Line Items]
Gain (loss) due to debt extinguishments							$ 0.8
Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Write-off debt issuance cost						$ 4.5
Gain (loss) due to debt extinguishments						(33.8)
Premium Paid						$ 29.3
Maturity date							Mar. 31, 2022
TRGP Revolver [Member]
Debt Instrument [Line Items]
Gain (loss) due to debt extinguishments							$ 15.0
Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt				6.15%
Senior Unsecured 6.500% Fixed Rate, due March 2034 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt				6.50%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Gain (loss) due to debt extinguishments				$ 2.1
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						4.20%
Net proceeds from private placement of notes		$ 990.1		$ 2,000.0	$ 1,700.0
Senior Unsecured Notes [Member] \| Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt											5.20%
Senior Unsecured Notes [Member] \| Senior Unsecured Notes Due February2033 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						4.20%		4.20%	4.20%
Maturity date								Feb. 28, 2033	Feb. 28, 2033
Aggregate principal amount issued						$ 750.0
Senior Unsecured Notes [Member] \| Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt				6.15%				6.15%	6.15%
Maturity date								Mar. 31, 2029	Mar. 31, 2029
Aggregate principal amount issued				$ 1,000.0
Senior Unsecured Notes [Member] \| Senior Unsecured 6.500% Fixed Rate, due March 2034 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt				6.50%				6.50%	6.50%
Maturity date								Mar. 31, 2034	Mar. 31, 2034
Aggregate principal amount issued				$ 1,000.0
Senior Unsecured Notes [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued								$ 1,500.0
Targa Resources Partners LP [Member] \| Senior Notes due 2027 [Member] \| Targa Pipeline Partners L P
Debt Instrument [Line Items]
Write-off debt issuance cost							$ 2.4
Interest rate on fixed rate debt							5.375%
Premium Paid							$ 12.6
Targa Resources Partners LP [Member] \| Senior Unsecured 4.200% Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt							4.20%
Targa Resources Partners LP [Member] \| Senior Unsecured 4.950% Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt							4.95%
Targa Resources Partners LP [Member] \| Senior Unsecured 5.875% Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt							5.875%