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EQUITY - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 126 Months Ended
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Feb. 28, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | 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 | Jun. 30, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock repurchased |  | 331,373 |  | 992,159 |  |  |  |  |  |  |  |  |  |  | 18,072,129
Average price paid per share |  | $ 101.57 |  | $ 100.54 |  |  |  |  |  |  |  |  |  |  | $ 68.12
Total purchase price |  | $ 33.7 | $ 47.6 | $ 99.8 | $ 119.5 |  |  |  |  |  |  |  |  |  | $ 1,200.0

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