CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	$ 16,949.8	$ 8,260.3	$ 8,671.1
Costs and expenses:
Product purchases and fuel	13,729.5	5,186.5	6,208.0
Operating expenses	747.0	698.4	703.4
Depreciation and amortization expense	870.6	865.1	971.6
General and administrative expense	273.2	254.6	280.7
Impairment of long-lived assets	452.3	2,442.8	225.3
Other operating (income) expense	12.4	116.6	89.2
Income (loss) from operations	864.8	(1,303.7)	192.9
Other income (expense):
Interest expense, net	(387.9)	(391.3)	(337.8)
Equity earnings (loss)	(23.9)	72.6	39.0
Gain (loss) from financing activities	(16.6)	45.6	(1.4)
Gain (loss) from sale of equity-method investment			69.3
Change in contingent considerations	(0.1)	0.3	(8.7)
Other, net	0.6	3.4
Income (loss) before income taxes	436.9	(1,573.1)	(46.7)
Income tax (expense) benefit	(14.8)	248.1	87.9
Net income (loss)	422.1	(1,325.0)	41.2
Less: Net income (loss) attributable to noncontrolling interests	350.9	228.9	250.4
Net income (loss) attributable to Targa Resources Corp.	71.2	(1,553.9)	(209.2)
Dividends on Series A Preferred Stock	87.3	91.7	91.7
Deemed dividends on Series A Preferred Stock		39.2	33.1
Net income (loss) attributable to common shareholders	$ (16.1)	$ (1,684.8)	$ (334.0)
Net income (loss) per common share - basic	$ (0.07)	$ (7.26)	$ (1.44)
Net income (loss) per common share - diluted	$ (0.07)	$ (7.26)	$ (1.44)
Weighted average shares outstanding - basic	228.6	232.2	232.5
Weighted average shares outstanding - diluted	228.6	232.2	232.5
Sales of Commodities [Member]
Revenues:
Total revenues	$ 15,602.5	$ 7,171.0	$ 7,393.8
Fees from Midstream Services [Member]
Revenues:
Total revenues	$ 1,347.3	$ 1,089.3	$ 1,277.3