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Provisions (Tables)
12 Months Ended
Dec. 31, 2020
Other provisions, contingent liabilities and contingent assets [Abstract]  
Summary of Provisions
Self-
insured
liabilities
$
Claims
$
Onerous
contracts
$
Expected
project
losses
$
Lease
restoration
$
Total
$
Balance, beginning of the year80.1 15.4 0.4 4.8 12.3 113.0 
Current year provisions32.3 7.2 4.8 0.7 1.8 46.8 
Acquisitions 0.1   0.1 0.2 
Paid or otherwise settled(14.2)(8.8)(0.5)(3.9)(2.1)(29.5)
Impact of foreign exchange(2.4)(0.1)0.1  0.1 (2.3)
95.8 13.8 4.8 1.6 12.2 128.2 
Less current portion5.6 10.4 1.4 1.6 1.5 20.5 
Long-term portion90.2 3.4 3.4  10.7 107.7