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Debt - Components (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt    
Total debt $ 341.1 $ 415.6
Current portion of long-term debt (18.5)  
Total long-term debt, less current portion 322.6 415.6
US Dollar notes under the Note Purchase Agreement    
Debt    
Debt, before unamortized debt issuance costs 220.0 220.0
Unamortized debt issuance costs (0.5) (0.7)
Capital lease obligations and other loans    
Debt    
Total debt 7.1 1.3
Other revolving loans    
Debt    
Total debt 2.9  
2015 Credit Agreement | US Dollar revolving loan    
Debt    
Total debt $ 111.6 $ 195.0