CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 422.1	$ (1,325.0)	$ 41.2
Commodity hedging contracts:
Other comprehensive income (loss), pre-tax	(117.3)	(309.1)	(2.4)
Other comprehensive income (loss), related income tax	28.2	74.8	0.6
Other comprehensive income (loss), after tax	(89.1)	(234.3)	(1.8)
Comprehensive income (loss)	333.0	(1,559.3)	39.4
Less: Comprehensive income (loss) attributable to noncontrolling interests	350.9	228.9	250.4
Comprehensive income (loss) attributable to Targa Resources Corp.	(17.9)	(1,788.2)	(211.0)
Commodity Contracts [Member]
Commodity hedging contracts:
Change in fair value, pre-tax	(534.6)	(218.3)	135.6
Change in fair value, related income tax	128.4	51.5	(32.3)
Change in fair value, after tax	(406.2)	(166.8)	103.3
Settlements reclassified to revenues, pre-tax	417.3	(90.8)	(138.0)
Settlements reclassified to revenues, related income tax	(100.2)	23.3	32.9
Settlements reclassified to revenues, after tax	$ 317.1	$ (67.5)	$ (105.1)