CAPITAL STOCK - Schedule of Capital Stock (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based payment award, exercises in period (in shares)	300
Proceeds from issuance of capital stock	$ 3.9	$ 0.3	$ 0.2
Capital stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued and outstanding, beginning balance (in shares)	119,000	103,000	106,100
Issued from treasury (in shares)	340	50	70
Cancelled under NCIB (in shares)	(3,200)	(2,700)	(3,140)
Stock issued during period, conversion of convertible shares (in shares)		18,600
Issued and outstanding, ending balance (in shares)	116,100	119,000	103,000
Capital stock | Multiple Voting Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued and outstanding, beginning balance (in shares)	0	18,600	18,600
Issued from treasury (in shares)	0	0	0
Cancelled under NCIB (in shares)	0	0	0
Stock issued during period, conversion of convertible shares (in shares)		(18,600)
Issued and outstanding, ending balance (in shares)	0	0	18,600
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based payment award, exercises in period (in shares)	300	30	20
Proceeds from issuance of capital stock	$ 3.9	$ 0.3	$ 0.2
Treasury stock | RSUs
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issue, share-based compensation arrangement (in shares)	40	20	50
Shares issue, share-based compensation arrangement	$ 0.5	$ 0.2	$ 0.4