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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
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Schedule of Reconciliation of Changes in Goodwill |
|  | Note |  |  | December 31 2018 $ |  |  | December 31 2017 $ |
Gross goodwill, beginning of the year |  |  |  |  |  |  | 1,734.6 |  |  |  | 2,006.1 |
Acquisitions |  |  |  |  |  |  | 96.3 |  |  |  | 16.3 |
Disposals |  |  | 8 |  |  |  | (120.2 | ) |  |  | (194.4 | )
Impact of foreign exchange |  |  |  |  |  |  | 88.5 |  |  |  | (93.4 | )
Gross goodwill, end of the year |  |  |  |  |  |  | 1,799.2 |  |  |  | 1,734.6 |
Accumulated impairment losses, beginning of the year |  |  |  |  |  |  | (178.0 | ) |  |  | (178.0 | )
Impairment of goodwill |  |  | 8 |  |  |  | (53.0 | ) |  |  | - |
Disposals |  |  | 8 |  |  |  | 53.0 |  |  |  | - |
Accumulated impairment losses, end of the year |  |  |  |  |  |  | (178.0 | ) |  |  | (178.0 | )
Net goodwill, end of the year |  |  |  |  |  |  | 1,621.2 |  |  |  | 1,556.6 |
Schedule of Goodwill Allocated | Goodwill was allocated to each CGU or group of CGUs as follows:
|  | December 31 2018 $ |  |  | December 31 2017 $ |
Consulting Services |  |  |  |  |  |  |  |
Canada |  |  | 358.2 |  |  |  | 337.8 |
United States |  |  | 1,003.7 |  |  |  | 917.7 |
Global |  |  | 259.3 |  |  |  | 183.2 |
Construction Services |  |  | - |  |  |  | 117.9 |
Allocated |  |  | 1,621.2 |  |  |  | 1,556.6 |
Summary of Most Sensitive Key Assumptions Used for CGUs | The values assigned to the most sensitive key assumptions for the Consulting Services – Global group of CGUs are listed in the table below:
Key Assumptions |  | Consulting Services – Global |
Operating margin rates |  |  | 5.6% to 8.7% |
After tax discount rate |  |  | 11.2% |
Terminal growth rate |  |  | 3.0% |
Non-cash working capital rates |  |  | 20.3% to 20.5% |
Average annual net revenue growth rate (2019-2023) |  |  | 3.7% |

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