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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Intangible assets other than goodwill [abstract]  
Schedule of Intangible Assets
Client
Relationships		Contract
Backlog
Software and other
Total
$$$$
Cost
December 31, 2022471.9 48.6 90.2 610.7 
Additions— — 13.7 13.7 
Additions arising on acquisitions25.2 12.4 — 37.6 
Removal of fully amortized assets(25.4)(47.8)(39.4)(112.6)
Impact of foreign exchange(7.6)(0.8)(0.5)(8.9)
December 31, 2023464.1 12.4 64.0 540.5 
Additions— — 84.4 84.4 
Additions arising on acquisitions137.7 45.8 0.3 183.8 
Removal of fully amortized assets(30.9)(13.4)(24.5)(68.8)
Impact of foreign exchange31.3 2.0 0.3 33.6 
December 31, 2024602.2 46.8 124.5 773.5 
Accumulated amortization
December 31, 2022215.6 31.4 43.3 290.3 
Amortization46.3 21.3 34.4 102.0 
Removal of fully amortized assets(25.4)(47.8)(39.4)(112.6)
Impact of foreign exchange(3.8)(0.8)(0.3)(4.9)
December 31, 2023232.7 4.1 38.0 274.8 
Amortization58.5 31.1 34.2 123.8 
Removal of fully amortized assets(30.9)(13.4)(24.5)(68.8)
Impact of foreign exchange15.7 1.1 (0.1)16.7 
December 31, 2024276.0 22.9 47.6 346.5 
Net book value
December 31, 2023231.4 8.3 26.0 265.7 
December 31, 2024326.2 23.9 76.9 427.0