Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Common Dividends Declared (Details)

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EQUITY AND EARNINGS PER SHARE - Common Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 16, 2020
Sep. 23, 2020
Jun. 22, 2020
Mar. 31, 2020
Dec. 16, 2019
Sep. 23, 2019
Jun. 18, 2019
Mar. 25, 2019
Dec. 20, 2018
Sep. 20, 2018
Jun. 21, 2018
Mar. 22, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dividends Payable [Line Items]                                    
Dividends declared per share of common stock (in dollars per share)                         $ 0.20 $ 0.50 $ 0.50 $ 0.50 $ 2.00 $ 2.00
Total Amounts Distributed (millions) $ 82.9 $ 62.4 $ 41.6 $ 20.8 $ 207.8 $ 207.8 $ 207.8 $ 207.7 $ 184.6 $ 170.2 $ 169.9 $ 168.1            
Quarterly Dividend                                    
Dividends Payable [Line Items]                                    
Dividends declared per share of common stock (in dollars per share) $ 0.20 $ 0.15 $ 0.10 $ 0.05 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50