Equity-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of units vested	$ 54.7	$ 38.2	$ 23.4
Allocated equity-based compensation expense	50.8
Unvested equity-based compensation expense	$ 59.0
Weighted-average term of unvested awards	10 months 24 days
Aris
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated equity-based compensation expense	$ 7.3
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation - payout percentage	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation - payout percentage	200.00%
Time-vested Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	1,379,023	1,393,972	1,140,789
Time-vested Awards [Member] \| Aris
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	513,590
TUR Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	181,389	360,497	231,395
ROA Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	211,648	407,789	245,143
Western Gas Partners, LP 2017 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units authorized under LTIP	3,431,251
Units available under LTIP	737,749
Western Midstream Partners, LP 2021 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units authorized under LTIP	14,403,998
Units available under LTIP	11,655,238
Executive Long-Term Incentive Plans [Member] \| Time-vested Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vesting period	3 years
Executive Long-Term Incentive Plans [Member] \| TUR Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vesting period	3 years
Executive Long-Term Incentive Plans [Member] \| ROA Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vesting period	3 years
Long-Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
In-kind distributions issued, number of units			3,253
Allocated equity-based compensation expense		$ 38.0	$ 32.0
Non-Executive Long-Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vesting period	3 years
Independent Director Long-Term Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vesting period	1 year

Western Midstream Partners, LP 10-K