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Basis of Preparation and Significant Accounting Policies - Impact of IFRS 15 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2016
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Accounts receivable/Contract asset $ 764.8 $ 790.5    
Inventories 1,061.8 890.6    
Deferred taxes 39.2 36.4 $ 40.1  
Deficit (1,545.2) (1,632.0)    
Revenue 6,110.5 6,016.5 5,639.2  
Cost of sales 5,692.7 5,588.9 5,248.1  
Net earnings $ 105.0 136.3 $ 66.9  
Increase (decrease) due to application of IFRS 15        
Disclosure of expected impact of initial application of new standards or interpretations [line items]        
Accounts receivable/Contract asset   227.0   $ 197.0
Inventories   (206.0)   (178.0)
Deferred taxes   (2.0)   (2.0)
Deficit   (19.0)   $ (17.0)
Revenue   30.0    
Cost of sales   28.0    
Net earnings   $ 2.0