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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Schedule of Reconciliation of Changes in Goodwill |
|  |  |  |  |  |  | December 31 |  |  |  | December 31 |
|  |  |  |  | 2017 |  |  | 2016 |
|  |  | Note |  |  |  | $ |  |  |  | $ |
Net goodwill, beginning of the year |  |  |  |  |  |  | 1,828.1 |  |  |  | 966.5 |
Current year acquisitions |  |  |  |  |  |  | 16.3 |  |  |  | 850.7 |
Current year disposals |  |  | 8 |  |  |  | (194.4 | ) |  |  | - |
Impact of foreign exchange |  |  |  |  |  |  | (93.4 | ) |  |  | 10.9 |
Net goodwill, end of the year |  |  |  |  |  |  | 1,556.6 |  |  |  | 1,828.1 |
Gross goodwill, end of the year |  |  |  |  |  |  | 1,734.6 |  |  |  | 2,006.1 |
Accumulated impairment losses, beginning and end of the year |  |  |  |  |  |  | (178.0 | ) |  |  | (178.0 | )
Net goodwill, end of the year |  |  |  |  |  |  | 1,556.6 |  |  |  | 1,828.1 |
Schedule of Goodwill Allocated | Goodwill was allocated to each CGU or groups of CGUs as follows:
|  |  | December 31 |  |  |  | December 31 |
|  | 2017 |  |  | 2016 |
|  |  | $ |  |  |  | $ |
Consulting Services |  |  |  |  |  |  |  |
Canada |  |  | 337.8 |  |  |  | 337.6 |
United States |  |  | 917.7 |  |  |  | 1,073.2 |
Global |  |  | 183.2 |  |  |  | 287.9 |
Construction Services |  |  | 117.9 |  |  |  | 129.4 |
Allocated |  |  | 1,556.6 |  |  |  | 1,828.1 |
Summary of Most Sensitive Key Assumptions Used for CGUs | The values assigned to the most sensitive key assumptions for Consulting Services – Global group of CGUs and Construction Services group of CGUs are listed in the table below:
Key Assumptions |  |  | Consulting Services – Global |  |  |  | Construction Services |
Operating margin rates |  |  | 5.6% - 8.1% |  |  |  | 1.1% - 1.3% |
After tax discount rate |  |  | 11.3% |  |  |  | 12.5% |
Terminal growth rate |  |  | 3.0% |  |  |  | 3.0% |
Non-cash working capital rates |  |  | 14.9% - 15.3% |  |  |  | (5.1%) - (5.6%) |

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