CAPITAL STOCK - Narrative (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 24, 2025 USD ($) shares	Mar. 31, 2025 USD ($) plan shares	Mar. 31, 2024 USD ($) plan shares	Mar. 31, 2024 $ / shares	Dec. 31, 2024 USD ($) shares	Oct. 30, 2024 shares	Dec. 31, 2023 USD ($)	Dec. 12, 2023 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Purchase of treasury stock for stock-based plans | $		$ 221.6	$ 101.6
Treasury stock, shares, acquired for share-based compensation plans (in shares)		1.7	2.8
Treasury stock, share-based compensation plan settlement (in shares)		2.0	3.2
Share-based compensation cash settlement | $		$ 156.0	$ 69.0
Treasury stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Treasury stock, common (in shares)		2.2			2.5
Common stock held by trustee for delivery under share-based compensation plans (in share) | $		$ 205.6			$ 92.9
Share-based payment award, exercises in period (in shares)		0.0	0.3
Treasury stock | Subsequent Event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Purchase of treasury stock for stock-based plans | $	$ 40.0
Repurchases in the open market through independent broker under SBC ASPPs and NCIB ASPP (in shares)	0.6
2023 SBC
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Accrual for repurchase of stock under automatic share purchase plan | $							$ 7.5
Chief Executive Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, exercises in period (in shares)			0.3
Exercised by our Chief Executive Officer (CEO), Weighted average exercise price (in dollars per share | $ / shares				$ 17.52
Share-Based Payment Arrangement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation cash settlement | $		$ 156.0	$ 69.0
PSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award performance period		3 years
PSUs | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, awards granted, percentage of target		0.00%
PSUs | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment award, awards granted, percentage of target		200.00%
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period		3 years
RSUs | Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		33.30%
RSUs | Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		33.30%
RSUs | Share-Based Payment Arrangement, Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		33.30%
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period		4 years
Employee Stock Option | Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		25.00%
Employee Stock Option | Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		25.00%
Employee Stock Option | Share-Based Payment Arrangement, Tranche Three
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		25.00%
Employee Stock Option | Share-Based Payment Arrangement, Tranche Four
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting percentage		25.00%
NCIB ASPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share repurchase program, number of effective plans | plan			1
SBC ASPP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share repurchase program, number of effective plans | plan		1	2
2023 NCIB
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share repurchase program, authorized, number of shares (in shares)								11.8
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]
Share repurchase program, authorized, number of shares (in shares)						8.6
Share repurchase program, remaining authorized, number of shares (in shares)		7.7