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Trade and Other Receivables (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of Trade and Other Receivables
December 31
2020		December 31
2019
$
$
Trade receivables, net of expected credit losses of $3.0 (2019 – $2.2)
702.7 787.3 
Holdbacks, current19.7 20.6 
Other15.6 9.8 
Trade and other receivables738.0 817.7 
Aging Analysis of Gross Trade Receivables
The aging analysis of gross trade receivables is as follows:
Total
$		1–30
$		31–60
$		61–90
$		91–120
$		121+
$
December 31, 2020705.7 389.5 160.3 60.9 25.9 69.1 
December 31, 2019789.5 395.9 221.1 63.5 27.8 81.2