CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenues	$ 1,679.7		$ 2,294.7
Costs and expenses:
Product purchases	1,268.3		1,915.1
Operating expenses	111.4		104.3
Depreciation and amortization expenses	119.6		79.6
General and administrative expenses	42.6		38.0
Other operating (income) expense	0.5		(0.7)
Income from operations	137.3		158.4
Other income (expense):
Interest expense, net	(55.0)		(33.9)
Equity earnings	1.7	[1]	4.9
Loss on debt redemptions and amendments	(9.0)		0
Other	(25.2)		0
Income before income taxes	49.8		129.4
Income tax (expense) benefit:
Current	(9.1)		(23.9)
Deferred	(6.1)		1.4
Income tax expense total	(15.2)		(22.5)
Net income	34.6		106.9
Less: Net income attributable to noncontrolling interests	31.4		87.3
Net income (loss) available to Targa Resources Corp.	$ 3.2		$ 19.6
Net income (loss) available per common share - basic (in dollars per share)	$ 0.07		$ 0.47
Net income (loss) available per common share - diluted (in dollars per share)	$ 0.07		$ 0.47
Weighted average shares outstanding - basic (in shares)	45.8		42.0
Weighted average shares outstanding - diluted (in shares)	45.9		42.1

[1] Includes equity earnings of acquired investments since the date of acquisition of February 27, 2015.