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Certain Provisions of the Partnership Agreement (Tables)
 12 Months Ended
Dec. 31, 2021
Partners' Capital [Abstract]  
Summary of Distribution Activity
A summary of the distribution activity relating to the Series B Preferred Units for the years ended December 31, 2021, 2020, and 2019 is provided below:
Declaration periodDistribution
paid as additional Series B Preferred Units		Cash distribution
(in millions)		Date paid/payable
2021
First Quarter of 2021150,871 $17.0 May 14, 2021
Second Quarter of 2021151,248 $17.0 August 13, 2021
Third Quarter of 2021151,626 $17.1 November 12, 2021
Fourth Quarter of 2021— $19.2 February 11, 2022 (1)
2020
First Quarter of 2020149,371 $16.8 May 13, 2020
Second Quarter of 2020149,745 $16.8 August 13, 2020
Third Quarter of 2020150,119 $16.9 November 13, 2020
Fourth Quarter of 2020150,494 $16.9 February 12, 2021
2019
First Quarter of 2019147,887 $16.7 May 14, 2019
Second Quarter of 2019148,257 $17.1 August 13, 2019
Third Quarter of 2019148,627 $17.1 November 13, 2019
Fourth Quarter of 2019148,999 $16.8 February 13, 2020
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(1)In December 2021 and January 2022, we paid $0.9 million and $1.0 million, respectively, of accrued distributions on the Series B Preferred Units redeemed. The remaining distribution of $17.3 million related to the fourth quarter of 2021 will be payable February 11, 2022. See “Note 18—Subsequent Event” for more information regarding the January 2022 Series B Preferred Unit redemption.