CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income (loss)	$ 332.6	$ 555.2
Commodity hedging contracts:
Other comprehensive income (loss), pre-tax	(67.1)	38.7
Other comprehensive income (loss), related income tax	15.4	(8.6)
Other comprehensive income (loss), after tax	(51.7)	30.1
Comprehensive income (loss)	280.9	585.3
Less: Comprehensive income (loss) attributable to noncontrolling interests	57.4	58.2
Comprehensive income (loss) attributable to Targa Resources Corp.	223.5	527.1
Commodity Contracts [Member]
Commodity hedging contracts:
Change in fair value, pre-tax	(70.3)	83.9
Change in fair value, related income tax	16.1	(18.6)
Change in fair value, after tax	(54.2)	65.3
Settlements reclassified to revenues, pre-tax	3.2	(45.2)
Settlements reclassified to revenues, related income tax	(0.7)	10.0
Settlements reclassified to revenues, after tax	$ 2.5	$ (35.2)