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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Nov. 30, 2018
Apr. 30, 2018
Dec. 31, 2017
 [1]
Jan. 01, 2017
 [1]
Disclosure of detailed information about business combination [line items]          
Goodwill $ 198.4     $ 23.2 $ 23.2
Atrenne          
Disclosure of detailed information about business combination [line items]          
Cash acquired     $ 1.1    
Current assets, net of cash acquired     31.5    
Property, plant and equipment     7.8    
Customer intangible assets and computer software assets     51.0    
Goodwill     64.0    
Current liabilities     (8.5)    
Deferred income taxes and other-long-term liabilities     (4.1)    
Identifiable assets acquired (liabilities assumed)     $ 141.7    
Impakt          
Disclosure of detailed information about business combination [line items]          
Cash acquired   $ 5.9      
Current assets, net of cash acquired   46.7      
Property, plant and equipment   20.9      
Customer intangible assets and computer software assets   223.0      
Goodwill   111.2      
Current liabilities   (23.8)      
Deferred income taxes and other-long-term liabilities   (52.6)      
Identifiable assets acquired (liabilities assumed)   $ 325.4      
[1] Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)