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Goodwill (Tables)
 12 Months Ended
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%)