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EQUITY - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended					12 Months Ended									129 Months Ended
	Feb. 28, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	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	Sep. 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				465,366												18,072,129
Average price paid per share				$ 89.92												$ 68.12
Total purchase price		$ 33.7	$ 47.6	$ 41.8	$ 99.8	$ 119.5										$ 1,200.0

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