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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Three months ended March 31
20252024
Translation adjustments:
Opening balance of foreign currency translation account$(35.5)$(28.1)
Foreign currency translation adjustments
0.7 (3.3)
Closing balance of foreign currency translation account$(34.8)$(31.4)
Foreign exchange derivatives:
Opening balance of unrealized net loss on currency forward cash flow hedges(i)
$(9.4)$— 
Net gain (loss) on currency forward cash flow hedges(i)
2.6 (9.6)
Reclassification of net loss on currency forward cash flow hedges to operations(i)
3.7 5.9 
Closing balance of unrealized net loss on currency forward cash flow hedges(i)
$(3.1)$(3.7)
Interest rate swap derivatives:
Opening balance of unrealized net gain on interest rate swap cash flow hedges(i)
$1.4 $— 
Net gain (loss) on interest rate swap cash flow hedges(i)
(1.6)4.2 
Reclassification of net gain on interest rate swap cash flow hedges to operations(i)
(0.5)(0.5)
Closing balance of unrealized net gain (loss) on interest rate swap cash flow hedges(i)
$(0.7)$3.7 
Employment benefit:
Opening balance of pension and non-pension post-employment benefit account(i)
$25.9 $27.9 
Net loss on pension and non-pension post-employment benefit plans(i)
(2.4)— 
Amortization of net gain on pension and non-pension post-employment benefit plans(i)
(0.6)(0.5)
Closing balance of pension and non-pension post-employment benefit account(i)
$22.9 $27.4 
Accumulated other comprehensive income (loss) (AOCI), net of tax
$(15.7)$(4.0)
(i)    Amounts were net of immaterial tax.