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 3 Months Ended 12 Months Ended
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. 18, 2017
Sep. 22, 2017
Jun. 21, 2017
Jan. 26, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dividends Payable [Line Items]                                                    
Dividends declared per share of common stock (in dollars per share) $ 0.50                       $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 2.00 $ 2.00 $ 1.98
Total Amounts Distributed (millions) $ 207.8 $ 207.8 $ 207.8 $ 207.7 $ 184.6 $ 170.2 $ 169.9 $ 168.1 $ 153.7 $ 153.7 $ 153.7 $ 147.5                            
Quarterly Dividend                                                    
Dividends Payable [Line Items]                                                    
Dividends declared per share of common stock (in dollars per share) $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.48