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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (Tables)
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Year ended December 31
202420232022
Translation adjustments:
Opening balance of foreign currency translation account$(28.1)$(24.7)$(18.0)
Foreign currency translation adjustments
(7.4)(3.4)(6.7)
Closing balance of foreign currency translation account$(35.5)$(28.1)$(24.7)
Foreign exchange derivatives (ii):
Opening balance of unrealized net gain (loss) on currency forward cash flow hedges$— $— $— 
Net loss on currency forward cash flow hedges(i)
(27.1)— — 
Reclassification of net loss on currency forward cash flow hedges to operations(i)
17.7 — — 
Closing balance of unrealized net loss on currency forward cash flow hedges(i)
$(9.4)$— $— 
Interest rate swap derivatives (ii):
Opening balance of unrealized net gain (loss) on interest rate swap cash flow hedges$— $— $— 
Net gain on interest rate swap cash flow hedges(i)
4.0 — — 
Reclassification of net gain on interest rate swap cash flow hedges to operations(i)
(2.6)— — 
Closing balance of unrealized net gain on interest rate swap cash flow hedges(i)
$1.4 $— $— 
Employment benefit:
Opening balance of pension and non-pension post-employment benefit account(i)
$27.9 $36.8 $10.6 
Net gain (loss) on pension and non-pension post-employment benefit plans(i)
(1.0)(5.9)26.2 
Amortization of net gain on pension and non-pension post-employment benefit plans(i)
(1.0)(3.0)— 
Closing balance of pension and non-pension post-employment benefit account(i)
$25.9 $27.9 $36.8 
Accumulated other comprehensive income (loss)
$(17.6)$(0.2)$12.1 
(i)    Amounts were net of immaterial tax.
(ii)    Our foreign exchange derivatives and interest rate swaps that we entered into prior to 2024 were not designated as effective cash flow hedges under GAAP until January 1, 2024. As a result, those derivatives and swaps did not qualify for hedge accounting in 2023 and 2022, such that changes in their fair values were marked-to-market through our consolidated statement of operations (as miscellaneous expense (income)) instead of being deferred in AOCI in 2023 and 2022. See note 19.