Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 01, 2022 JointVenture	Dec. 31, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
interest income (expense)	$ (446.1)	$ (387.9)	$ (391.3)
WestTex LLC [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	72.80%
Logistics and Transportation [Member] | Cedar Bayou Fractionators LP [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	88.00%
Logistics and Transportation [Member] | Grand Prix Joint Venture [Member] | Targa Resources Partners Lp [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	75.00%
Logistics and Transportation [Member] | Train Seven [Member] | Targa Resources Partners Lp [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	80.00%
Logistics and Transportation [Member] | Cayenne Pipeline Limited Liability Company [Member] | Targa Resources Partners Lp [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	50.00%
Logistics and Transportation [Member] | Gulf Coast Fractionators [Member] | Targa Resources Partners Lp [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	38.80%
Gathering and Processing [Member] | Carnero Joint Venture [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	50.00%
Gathering and Processing [Member] | Centrahoma Processing LLC [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	60.00%
Gathering and Processing [Member] | Targa Badland [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	55.00%
Gathering and Processing [Member] | Venice Energy Services [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	76.80%
Gathering and Processing [Member] | Cayenne Pipeline Limited Liability Company [Member] | Targa Resources Partners Lp [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest	50.00%
Series A Preferred Stock [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Carrying value	$ 0.0	749.7	301.4		$ 278.8
Cumulative Effect, Period of Adoption, Adjustment [Member] | Series A Preferred Stock [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Carrying value			448.3
Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Payment of commodities due period	10 days
Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Payment of commodities due period	30 days
Mandatorily Redeemable Preferred Interests [Member] | West OK [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest				100.00%
Mandatorily Redeemable Preferred Interests [Member] | West TX [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Ownership interest				72.80%
Mandatorily Redeemable Preferred Interests [Member] | Joint Ventures [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of joint ventures | JointVenture				2
Notes receivable, face amount	$ 1,900.0
Notes receivable, due date	Jul. 31, 2042
interest income (expense)	$ (1.8)	$ 12.3	$ 8.6