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Commitments (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Summary of Lease Commitments These commitments as at December 31, 2020, are as follows:
Total
$		Less than 1 Year
$		1 to 3 Years
$		After 3 Years
$
Variable lease payments299.2 50.1 78.6 170.5 
Short-term and low value lease payments3.3 2.2 0.9 0.2 
Leases not commenced but committed24.7 0.6 4.3 19.8 
Purchase obligations85.2 51.6 33.0 0.6 
412.4 104.5 116.8 191.1