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PARTNERS' CAPITAL - Narrative (Details) - Limited Partners' Capital - USD ($) $ / shares in Units, $ in Millions	35 Months Ended
	Mar. 31, 2021	May 31, 2018
Partners' capital
Repurchase and retire authorization		$ 100.0
Treasury units retired	$ 93.5
Number of units retired	5,460,639
Repurchase price (in dollars per unit)	$ 17.12
Remaining authorized amount	$ 6.5

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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