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EQUITY - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 123 Months Ended
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2021
Share Repurchase Program                          
Stock repurchase amount authorized during period $ 200.0     $ 250.0 $ 250.0 $ 250.0 $ 100.0 $ 100.0 $ 100.0 $ 100.0 $ 100.0 $ 100.0  
Authorized amount   $ 1,600.0                     $ 1,600.0
Number of shares of common stock repurchased   490,632 1,062,881                   17,740,756
Average price paid per share   $ 96.97 $ 112.46                   $ 67.50
Total purchase price   $ 47.6 $ 119.5                   $ 1,200.0