Partners' Capital, Mezzanine Capital and Distributions (Narrative) (Details)					1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 03, 2023 $ / shares shares	Apr. 03, 2023 $ / shares shares	Apr. 14, 2020 USD ($) shares	Sep. 23, 2019 USD ($) $ / shares shares	Dec. 31, 2021	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Aug. 08, 2023 shares	Dec. 31, 2022 shares	Sep. 29, 2022	Sep. 01, 2022	May 16, 2022 USD ($) shares
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares						122,464,318		122,464,318			122,579,218
Stock repurchased and cancelled (in shares) | shares						115,000		115,000
Purchase price						$ 1,044,000		$ 1,044,000
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units						(22,308,000)	$ (18,684,000)	(69,220,000)	$ (56,052,000)
Redeemable noncontrolling interests, no units issued and outstanding at September 30, 2023 and 0 preferred units issued and outstanding June 30, 2023														$ 270,100,000
Net income attributable to redeemable noncontrolling interests						$ 0	0	$ 0	30,443,000
Cameron Highway Oil Pipeline | Affiliated Entity
Partners Capital And Distributions [Line Items]
Percentage of ownership after transaction					64.00%
Independence Hub, LLC | Affiliated Entity | Genesis Energy, LLC
Partners Capital And Distributions [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent						80.00%		80.00%
Subsidiary | Alkali Holdings
Partners Capital And Distributions [Line Items]
Period for occurrence of triggering events				6 years 6 months
Redeemable Noncontrolling Interest, Equity, Preferred, Units Issued, Value				$ 55,000,000					10,000,000
Redeemable noncontrolling interest preferred commitment				$ 350,000,000
Expansion project extension period			1 year
Equity preferred units issued (in units) | shares			1,750
Commitment period			4 years
Redeemable Noncontrolling Interest, Equity, Preferred, Purchase Price Per Unit | $ / shares				$ 1,000
Redemption value of redeemable preferred noncontrolling interest														$ 288,600,000
Net income attributable to redeemable noncontrolling interests						$ 0	0	$ 0	30,443,000
Redemption accretion value adjustments									1,900,000
Subsidiary | Alkali Holdings | Maximum
Partners Capital And Distributions [Line Items]
Number of preferred units outstanding (in units) | shares			351,750
Redeemable noncontrolling interest preferred commitment			$ 351,800,000
Subsidiary | Alkali Holdings | Minimum
Partners Capital And Distributions [Line Items]
Redeemable noncontrolling interest preferred commitment				$ 251,800,000
Class A Common Units | 2023 Repurchase Program
Partners Capital And Distributions [Line Items]
Percentage of shares authorized for repurchase										0.10
Shares authorized to be repurchased (in shares) | shares										12,253,922
Stock repurchased and cancelled (in shares) | shares						114,900
Shares purchased (in shares) | $ / shares						$ 9.09
Purchase price						$ 1,000,000
Class A Convertible Preferred Stock Units
Partners Capital And Distributions [Line Items]
Class A Convertible Preferred Units redeemed (in shares) | shares	1,483,240	1,483,240
Class A Convertible Preferred units redeemed (in dollars per share) | $ / shares	$ 33.71	$ 33.71
Class A Convertible Preferred Units, carrying value (dollars per share) | $ / shares	$ 35.2	$ 35.2
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units						(23,300,000)	$ (18,700,000)	(71,300,000)	$ (56,100,000)
Temporary equity, adjustment						1,000,000		2,100,000
Stock reset rate percentage											8.75%	11.24%	10.75%
Redeemable Noncontrolling Interest Preferred Units
Partners Capital And Distributions [Line Items]
Base Preferred Return Amount, Alkali Holdings						$ 18,500,000		$ 18,500,000
Redeemable Noncontrolling Interest Preferred Units | Subsidiary | Alkali Holdings
Partners Capital And Distributions [Line Items]
Number of preferred units outstanding (in units) | shares				55,000		0		0						251,750
Limited Partner [Member] | Class A Common Units
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares						122,424,321		122,424,321
Limited Partner [Member] | Class B Common Units
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares						39,997		39,997
Limited Partner [Member] | Preferred Class A
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares						23,853,538		23,853,538