Equity-Based Compensation Plans (Narrative) (Details) - 2010 Plan - Phantom Units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period (in units)	74,106	70,068	71,340
Weighted average grant date fair value of phantom unit (in dollars per unit)	$ 10.26	$ 9.92	$ 8.83
Compensation expense	$ 1.2	$ 0.7	$ 1.4
Liability for compensation awards	$ 1.4	$ 2.1