CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Targa Resources Corp.
Net income attributable to common shareholders	$ 3.2	$ 19.6
Commodity hedging contracts:
Change in fair value, pre-tax	1.8	(1.5)
Change in fair value, related income tax	(0.7)	0.6
Change in fair value, after tax	1.1	(0.9)
Settlements reclassified to revenues, pre-tax	(0.9)	0.8
Settlements reclassified to revenues, related income tax	0.3	(0.3)
Settlements reclassified to revenues, after tax	(0.6)	0.5
Interest rate swaps:
Settlements reclassified to interest expense, net, pre-tax	0	0.2
Settlements reclassified to interest expense, net, related income tax	0	(0.1)
Settlements reclassified to interest expense, net, after tax	0	0.1
Other comprehensive income (loss) attributable to Targa Resources Corp., pre-tax	0.9	(0.5)
Other comprehensive income (loss) attributable to Targa Resources Corp., related income tax	(0.4)	0.2
Other comprehensive income (loss) attributable to Targa Resources Corp., after tax	0.5	(0.3)
Comprehensive income attributable to Targa Resources Corp.	3.7	19.3
Noncontrolling interests
Net income attributable to noncontrolling interests	31.4	87.3
Commodity hedging contracts:
Change in fair value, pre-tax	23.4	(10.3)
Change in fair value, related income tax	0	0
Change in fair value, after tax	23.4	(10.3)
Settlements reclassified to revenues, pre-tax	(7.2)	5.5
Settlements reclassified to revenues, related income tax	0	0
Settlements reclassified to revenues, after tax	(7.2)	5.5
Interest rate swaps:
Settlements reclassified to interest expense, net, pre-tax	0	1.1
Settlements reclassified to interest expense, net, related income tax	0	0
Settlements reclassified to interest expense, net, after tax	0	1.1
Other comprehensive loss attributable to noncontrolling interests, pre-tax	16.2	(3.7)
Other comprehensive loss attributable to noncontrolling interests, related income tax	0	0
Other comprehensive loss attributable to noncontrolling interests, after tax	16.2	(3.7)
Comprehensive income attributable to noncontrolling interests	47.6	83.6
Total
Net income	34.6	106.9
Commodity hedging contracts:
Change in fair value, pre-tax	25.2	(11.8)
Change in fair value, related income tax	(0.7)	0.6
Change in fair value, after tax	24.5	(11.2)
Settlements reclassified to revenues, pre-tax	(8.1)	6.3
Settlements reclassified to revenues, related income tax	0.3	(0.3)
Settlements reclassified to revenues, after tax	(7.8)	6.0
Interest rate swap:
Settlements reclassified to interest expense, net, pre-tax	0	1.3
Settlements reclassified to interest expense, net, related income tax	0	(0.1)
Settlements reclassified to interest expense, net, after tax	0	1.2
Other comprehensive income (loss) attributable to Targa Resources Corp, pre-tax	17.1	(4.2)
Other comprehensive income (loss) attributable to Targa Resources Corp, related income tax	(0.4)	0.2
Other comprehensive income (loss) attributable to Targa Resources Corp, after tax	16.7	(4.0)
Total comprehensive income	$ 51.3	$ 102.9