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COMMON STOCK - Treasury Stock (Narrative) (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2019
Treasury Stock
Aggregate cost of stock repurchases	$ 625,400,000	$ 263,300,000	$ 795,500,000
Treasury Stock
Treasury Stock
Shares repurchased (in shares)	3.1	1.5	5.5
Aggregate cost of stock repurchases	$ 625,400,000	$ 263,300,000	$ 795,500,000
May 2019
Treasury Stock
Authorized amount for share repurchase				$ 1,000,000,000.0

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