CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 2,986.4	$ 2,131.8	$ 7,886.3	$ 6,112.1
Costs and expenses:
Product purchases (see Note 3)	2,383.5	1,663.1	6,229.7	4,737.8
Operating expenses	194.9	155.5	538.7	462.7
Depreciation and amortization expense	206.3	208.3	607.1	602.8
General and administrative expense	63.2	49.9	176.9	149.5
Impairment of property, plant and equipment		378.0		378.0
Other operating (income) expense	61.8	0.6	15.7	17.2
Income (loss) from operations	76.7	(323.6)	318.2	(235.9)
Other income (expense):
Interest expense, net	(78.2)	(56.1)	(124.2)	(181.2)
Equity earnings (loss)	3.0	0.2	6.4	(16.6)
Gain (loss) from financing activities			(2.0)	(16.5)
Change in contingent considerations	(16.6)	126.8	(12.1)	125.6
Other, net		0.2		(2.7)
Income (loss) before income taxes	(15.1)	(252.5)	186.3	(327.3)
Income tax (expense) benefit	3.9	97.4	(37.7)	132.3
Net income (loss)	(11.2)	(155.1)	148.6	(195.0)
Less: Net income (loss) attributable to noncontrolling interests	12.5	12.5	40.4	34.3
Net income (loss) attributable to Targa Resources Corp.	(23.7)	(167.6)	108.2	(229.3)
Dividends on Series A Preferred Stock	22.9	22.9	68.8	68.8
Deemed dividends on Series A Preferred Stock	7.4	6.5	21.5	19.0
Net income (loss) attributable to common shareholders	$ (54.0)	$ (197.0)	$ 17.9	$ (317.1)
Net income (loss) per common share - basic	$ (0.24)	$ (0.91)	$ 0.08	$ (1.56)
Net income (loss) per common share - diluted	$ (0.24)	$ (0.91)	$ 0.08	$ (1.56)
Weighted average shares outstanding - basic	226.5	215.6	222.1	203.8
Weighted average shares outstanding - diluted	226.5	215.6	223.8	203.8
Dividends per common share declared for the period	$ 0.91	$ 0.91	$ 2.73	$ 2.73
Sales of Commodities [Member]
Revenues:
Total revenues	$ 2,654.1	$ 1,871.5	$ 6,981.4	$ 5,353.1
Fees from Midstream Services [Member]
Revenues:
Total revenues	$ 332.3	$ 260.3	$ 904.9	$ 759.0