SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION - Share Repurchases (Details) - Common Stock $ in Millions	1 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) item	Mar. 31, 2020 USD ($) item	Nov. 30, 2018 USD ($) item	Nov. 01, 2020 USD ($) shares	Nov. 03, 2019 USD ($) shares	Jan. 31, 2020 USD ($)
Share repurchases
Number of Shares | shares				6,563,135	8,319,813
Cost of Shares				$ 267.3	$ 322.8
Share Repurchase Program Of September 2020
Share repurchases
Number of share repurchase programs | item	3
Authorized share repurchase amount	$ 500.0
Share Repurchase Program of March 2020
Share repurchases
Number of share repurchase programs | item		3
Authorized share repurchase amount		$ 500.0
Number of Shares | shares				6,321,661
Cost of Shares				$ 258.3
Share Repurchase Program of November 2018 Plan
Share repurchases
Number of share repurchase programs | item			3
Authorized share repurchase amount			$ 500.0			$ 500.0
Number of Shares | shares					8,161,079
Cost of Shares					$ 316.0
Share Repurchase Program of April 2014 Plan
Share repurchases
Number of Shares | shares				241,474	158,734
Cost of Shares				$ 9.0	$ 6.8