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Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of information about receivables, contract assets, and deferred revenue (contract liabilities) from contracts with customers

The following table provides information about receivables, contract assets, and deferred revenue (contract liabilities) from contracts with customers:

 

    
                 December 31
2018		  
 		    
                 January 1
2018		  
 
       $       $  

Receivables

     

    Trade receivables and holdbacks

      821.9       816.1  

    Unbilled receivables

      384.6       315.6  

Contract assets

      59.7       69.2  

Deferred revenue

      (174.4 )      (196.4 ) 

Total Consulting Services

      1,091.8       1,004.5  
Significant Increases (Decreases) in Contract Assets and Deferred Revenue

 

 

       

 For the year ended

December 31, 2018

  

 
                Contract Assets           Deferred Revenue  
       Note        $       $  

Acquisitions

         0.7       7.2  

Discontinued operations and disposition of subsidiaries

      8        (15.3 )      (59.3 )