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Segment and Geographic Information - Reconciliation to IFRS Earnings Before Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Segment income $ 149.3 $ 106.3 $ 143.2
Reconciling items:      
Employee SBC expense 34.1 33.4 30.1
Amortization of intangible assets (excluding computer software) 29.6 15.4 8.9
Other Charges (Recoveries) (note 16) (49.9) 61.0 37.0
Other solar charges (inventory and A/R write-down) 9.8 0.2  
Earnings before income taxes $ 99.8 $ 81.9 $ 133.1
ATS      
Disclosure of operating segments [line items]      
Segment margin (as a percentage) 2.80% 4.60% 4.90%
CCS      
Disclosure of operating segments [line items]      
Segment margin (as a percentage) 2.60% 2.50% 2.90%
Operating segments      
Disclosure of operating segments [line items]      
Segment income $ 158.1 $ 213.9 $ 217.2
Operating segments | ATS      
Disclosure of operating segments [line items]      
Segment income 64.2 102.5 96.8
Operating segments | CCS      
Disclosure of operating segments [line items]      
Segment income 93.9 111.4 120.4
Reconciling items      
Reconciling items:      
Finance costs 49.5 24.4 10.1
Employee SBC expense 34.1 33.4 30.1
Other Charges (Recoveries) (note 16) (49.9) 61.0 37.0
Inventory fair value adjustment (note 3) 0.0 1.6 0.0
Reconciling items | Intangible assets, excluding computer software      
Reconciling items:      
Amortization of intangible assets (excluding computer software) 24.6 11.6 5.5
Reconciling items | Solar charges      
Reconciling items:      
Other solar charges (inventory and A/R write-down) $ 0.0 $ 0.0 $ 1.4