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Employee Defined Benefit Obligations (Tables)
 12 Months Ended
Dec. 31, 2022
Employee Benefits [Abstract]  
Summary of Employee Defined Benefit Obligations
December 31,
2022		December 31,
2021
$$
Net defined benefit pension asset(57.4)(17.0)
Net defined benefit pension liability17.0 42.8 
End of employment benefit plans15.3 15.9 
32.3 58.7 
December 31,
2022		December 31,
2021
$$
Included in the consolidated statement of financial position within:
Net defined benefit asset(57.4)(17.0)
Net defined benefit liability17.0 42.8 
(40.4)25.8 
Summary of Reconciliation for Net Defined Benefit Liability
The following table presents a reconciliation from the opening balances to the closing balances for the net defined benefit (asset) liability and its components:
20222021
Defined
Benefit
 Obligation
$		Fair Value
of Plan
Assets
$		Net
Defined
Benefit
(Asset) Liability
$		Defined
Benefit
 Obligation
$		Fair Value
of Plan
Assets
$		Net
Defined
Benefit
Liability
$
Balance, beginning of the year586.1 (560.3)25.8 601.6 (575.2)26.4 
Administrative and marketing expenses
Interest expense (income)9.8 (9.5)0.3 6.8 (6.7)0.1 
Administrative expenses paid by the Plans— 1.6 1.6 — 1.0 1.0 
9.8 (7.9)1.9 6.8 (5.7)1.1 
Other comprehensive loss (income)
Adjustments on the plan assets, excluding interest income— 127.0 127.0 — 11.1 11.1 
Actuarial (gains) losses arising from:
Changes in demographic assumptions(0.3)— (0.3)5.0 — 5.0 
Changes in financial assumptions(192.7)— (192.7)0.5 — 0.5 
Experience adjustments16.3 — 16.3 (1.8)— (1.8)
Remeasurement (gain) loss, before tax(176.7)127.0 (49.7)3.7 11.1 14.8 
Effect of movement in exchange rates(22.7)21.9 (0.8)(10.4)10.1 (0.3)
(199.4)148.9 (50.5)(6.7)21.2 14.5 
Other
Benefits paid(14.0)14.0 — (15.6)15.6 — 
Contributions by employer— (17.6)(17.6)— (16.2)(16.2)
(14.0)(3.6)(17.6)(15.6)(0.6)(16.2)
Balance, end of the year382.5 (422.9)(40.4)586.1 (560.3)25.8 
Summary of Major Categories of Plan Assets, Measured at Fair Value Major categories of plan assets, measured at fair value, are as follows:
December 31,December 31,
20222021
$$
Cash and cash equivalents18.9 23.1 
Investments quoted in active markets (mutual, exchange-traded, and pooled funds):
  Equities15.2 43.1 
  Corporate bonds and fixed income6.5 9.9 
  Pooled fund liability-driven investments18.7 26.2 
  Property funds0.6 1.6 
Unquoted investments:
  Annuity policies217.7 317.5 
  Insurance contracts:
Equities and property97.5 100.7 
Corporate bonds26.8 27.9 
Cash and cash equivalents21.0 10.3 
Fair value of plan assets422.9 560.3 
Summary of Principal Assumptions Used In Determining Pension Benefit Obligations The principal assumptions used in determining pension benefit obligations for the Plans are shown below (expressed as weighted averages):
December 31,
2022		December 31,
2021
Discount rate4.60 %1.80 %
Rate of increase in salaries4.30 %4.27 %
Rate of inflation, pre-retirement2.68 %2.74 %
Rate of increase in future pensions payment3.39 %3.49 %
Life expectancy at age 65 for current pensioners:
  Male22 years22 years
  Female24 years24 years
Life expectancy at age 65 for current members aged 45:
  Male23 years23 years
  Female25 years25 years
Summary of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions
Quantitative sensitivity analyses showing the impact on the defined benefit obligation for significant assumptions are as follows:
December 31,
2022		December 31,
2021
Increase
$		Decrease
$		Increase
$		Decrease
$
Change in discount rate by 0.25%
(11.4)11.6 (22.3)23.8 
Change in pre-retirement inflation rate by 0.25%
2.7 (2.7)5.1 (5.1)
Change in salary growth by 0.25%
0.3 (0.3)1.1 (1.1)
Change in pension increase assumption by 0.25%
7.1 (7.1)12.3 (11.6)
Change in one year in the life expectancy10.3 (10.3)12.0 (12.0)