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Investments - Rollforward of Investments in Joint Ventures and Associates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Beginning balance $ 10.0 $ 7.2  
Debt funding 0.9 (1.0)  
Transfer from trade receivables   3.7  
Share of results 0.1 0.5 $ (1.2)
Impairment (2.2) 0.0 (4.6)
Ending balance 9.2 10.0 7.2
Exchange differences on translation [abstract]      
Increase (decrease) through foreign exchange, financial assets 0.4 (0.4)  
Equity investments | Joint Ventures      
Disclosure of financial assets [line items]      
Beginning balance 2.7 2.4  
Share of results 0.1 0.5  
Ending balance 2.9 2.7 2.4
Exchange differences on translation [abstract]      
Increase (decrease) through foreign exchange, financial assets 0.1 (0.2)  
Loan Investments      
Disclosure of financial assets [line items]      
Beginning balance 7.3 4.8  
Debt funding 0.9 (1.0)  
Transfer from trade receivables   3.7  
Impairment (2.2)    
Ending balance 6.3 7.3 $ 4.8
Exchange differences on translation [abstract]      
Increase (decrease) through foreign exchange, financial assets $ 0.3 $ (0.2)