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Debt Obligations - Debt Repurchases Summary (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Write-off of debt issuance costs	$ (2.4)
Gain (loss) from financing activities	$ 63.5	$ 45.6	$ (1.4)	$ (2.0)
Senior Unsecured Notes [Member] | TRC Revolver [Member]
Debt Instrument [Line Items]
Write-off of debt issuance costs		0.0	0.0	(0.7)
Senior Unsecured Notes [Member] | TRP Revolver [Member]
Debt Instrument [Line Items]
Write-off of debt issuance costs		0.0	0.0	(1.3)
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 6¾% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Premium over face value paid upon redemption		(11.1)	0.0	0.0
Write-off of debt issuance costs		(2.6)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5⅛% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		4.4	0.0	0.0
Write-off of debt issuance costs		(0.1)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5⅞% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		7.1	0.0	0.0
Write-off of debt issuance costs		(0.2)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5⅜% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		5.3	0.0	0.0
Write-off of debt issuance costs		(0.2)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5% Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		11.7	0.0	0.0
Write-off of debt issuance costs		(0.4)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 6½% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		9.3	0.0	0.0
Write-off of debt issuance costs		(0.4)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 6⅞% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		15.5	0.0	0.0
Write-off of debt issuance costs		(0.6)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5½% Senior Notes due 2030 [Member]
Debt Instrument [Line Items]
Discount over face value paid upon redemption		10.2	0.0	0.0
Write-off of debt issuance costs		(0.5)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 5¼% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Write-off of debt issuance costs		(1.8)	0.0	0.0
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Partnership 4⅛% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Write-off of debt issuance costs		$ 0.0	$ (1.4)	$ 0.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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