SHARE CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Preferred stock par value (in usd per share)	$ 0.20	$ 0.20
Preferred stock liquidation preference per share (in usd per share)	$ 1,000	$ 1,000
Preferred stock lock up period	5 years
Shares acquired (shares)	9.6	8.9
Shares acquired	$ 150.0	$ 200.0
Shares withheld to meet employees' tax withholding obligations (in shares)	1.9	2.4
Fair values of shares withheld	$ 37.5	$ 44.7
Share repurchase plan, remaining authorized amount	$ 382.2	$ 532.2
Common stock issued (in shares)	566.1	566.1	566.1
Treasury shares held, as unvested restricted stock awards (in shares)	8.1	8.2
Common shares market price (in USD per share)	$ 17.84
Treasury shares market value	$ 2,200.0
Treasury Shares
Derivative [Line Items]
Common stock issued (in shares)	124.7	119.5
OppenheimerFunds
Derivative [Line Items]
Preferred stock par value (in usd per share)	$ 0.20
Preferred stock liquidation preference per share (in usd per share)	$ 1,000
Fixed rate on preferred stock (percent)	5.90%