CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Total revenues	$ 4,459.7	$ 2,115.1	$ 11,508.2	$ 5,687.5
Costs and expenses:
Product purchases and fuel	3,614.7	1,322.9	9,159.8	3,405.1
Operating expenses	189.4	162.2	545.3	506.8
Depreciation and amortization expense	222.8	203.7	650.9	647.3
General and administrative expense	67.3	58.6	192.4	180.6
Impairment of long-lived assets				2,442.8
Other operating (income) expense	(1.0)	72.2	3.4	73.8
Income (loss) from operations	366.5	295.5	956.4	(1,568.9)
Other income (expense):
Interest expense, net	(91.0)	(97.7)	(284.2)	(292.4)
Equity earnings (loss)	14.3	18.6	38.9	54.1
Gain (loss) from financing activities		(13.7)	(16.6)	47.4
Other, net	0.2	1.4	0.3	2.2
Income (loss) before income taxes	290.0	204.1	694.8	(1,757.6)
Income tax (expense) benefit	(2.0)	(31.9)	(23.5)	286.6
Net income (loss)	288.0	172.2	671.3	(1,471.0)
Less: Net income (loss) attributable to noncontrolling interests	105.8	102.9	286.5	116.5
Net income (loss) attributable to Targa Resources Corp.	182.2	69.3	384.8	(1,587.5)
Dividends on Series A Preferred Stock	21.8	22.9	65.5	68.8
Deemed dividends on Series A Preferred Stock		9.5		27.7
Net income (loss) attributable to common shareholders	$ 160.4	$ 36.9	$ 319.3	$ (1,684.0)
Net income (loss) per common share - basic	$ 0.70	$ 0.16	$ 1.40	$ (7.22)
Net income (loss) per common share - diluted	$ 0.66	$ 0.16	$ 1.38	$ (7.22)
Weighted average shares outstanding - basic	228.8	233.4	228.6	233.2
Weighted average shares outstanding - diluted	276.4	233.8	231.6	233.2
Sales of Commodities [Member]
Revenues:
Total revenues	$ 4,118.1	$ 1,840.8	$ 10,577.3	$ 4,900.8
Fees from Midstream Services [Member]
Revenues:
Total revenues	$ 341.6	$ 274.3	$ 930.9	$ 786.7