CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)	$ 155.4	$ 177.1	$ 383.3	$ (1,643.2)
Commodity hedging contracts:
Other comprehensive income (loss), pre-tax	(179.0)	(193.2)	(200.8)	(94.1)
Other comprehensive income (loss), related income tax	43.0	46.4	48.2	23.2
Other comprehensive income (loss), after tax	(136.0)	(146.8)	(152.6)	(70.9)
Comprehensive income (loss)	19.4	30.3	230.7	(1,714.1)
Less: Comprehensive income (loss) attributable to noncontrolling interests	99.2	96.1	180.7	13.6
Comprehensive income (loss) attributable to Targa Resources Corp.	(79.8)	(65.8)	50.0	(1,727.7)
Commodity Contracts [Member]
Commodity hedging contracts:
Change in fair value, pre-tax	(232.6)	(133.0)	(404.2)	26.2
Change in fair value, related income tax	55.7	31.2	95.9	(8.2)
Change in fair value, after tax	(176.9)	(101.8)	(308.3)	18.0
Settlements reclassified to revenues, pre-tax	53.6	(60.2)	203.4	(120.3)
Settlements reclassified to revenues, related income tax	(12.7)	15.2	(47.7)	31.4
Settlements reclassified to revenues, after tax	$ 40.9	$ (45.0)	$ 155.7	$ (88.9)