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Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Quarterly distributions on common units
The table below presents information regarding the quarterly dividends on the common shares, which were made at the sole discretion of the Board of Directors of the Company.
Dividend Record DateDividend Payment DateDividend per Common ShareDividend to Common Stockholders
(Dollars in millions, except per share data)
May 12, 2020May 19, 2020$0.25 $87.2 
August 11, 2020August 18, 20200.25 88.3 
November 10, 2020November 17, 20200.25 88.4 
February 16, 2021February 23, 20210.25 88.7 
Total 2020 Dividend Year$1.00 $352.6 
May 11, 2021May 19, 2021$0.25 $88.7 
August 10, 2021August 17, 20210.25 89.3 
November 9, 2021November 17, 20210.25 89.1 
February 15, 2022February 23, 20220.25 89.5 
Total 2021 Dividend Year$1.00 $356.6