CAPITAL STOCK - Schedule of Common Shares Purchases for Cancellation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Aggregate cost (including transaction fees) of common shares repurchased for cancellation	$ 152.0	$ 35.6	$ 34.6
Number of common shares repurchased for cancellation (in shares)	3.2	2.6	3.4
Weighted average price per share for repurchases (in dollars per share)	$ 47.15	$ 13.83	$ 10.45
2023 NCIB
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Accrual for repurchase of stock under automatic share purchase plan		$ 2.7
2024 NCIB
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Accrual for repurchase of stock under automatic share purchase plan	$ 2.8
NCIB ASPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of common shares repurchased for cancellation (in shares)	0.5	0.9	2.5