STOCKHOLDERS' EQUITY - Capital Stock (Details) - At-The-Market Equity Offering Program $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Equity offering [Line Items]
Stock issued during period, shares, new issues, equity offering program | shares	0.2
Shares Issued, Price Per Share | $ / shares	$ 57.22
Equity offering program, remaining authorized offering amount | $	$ 744.1