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Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income taxes    
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits $ 34.7 $ 39.6
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards (4.9) $ 2.4
Foreign    
Income taxes    
Loss carryforwards 125.7  
Operating loss carryforwards to expire or be refunded 69.0  
Tax credit carryforwards 2.9  
Tax credit carryforwards to expire or be refunded 2.7  
U.S. State    
Income taxes    
Loss carryforwards 48.6  
Operating loss carryforwards to expire or be refunded 48.6  
Tax credit carryforwards 13.0  
Tax credit carryforwards to expire or be refunded $ 7.3