XML 73 R58.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financing Arrangements (Details)
€ in Millions
6 Months Ended 12 Months Ended
Apr. 10, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2018
EUR (€)
Apr. 29, 2018
USD ($)
Apr. 29, 2018
EUR (€)
Apr. 09, 2018
USD ($)
Apr. 03, 2018
USD ($)
Mar. 23, 2018
USD ($)
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Short-term debt   $ 89,000,000 $ 58,200,000              
Minimum | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Interest rate (percent)   0.10% 0.10%              
Debt instrument, term   1 day 1 day              
Maximum | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Interest rate (percent)   9.30% 9.30%              
Debt instrument, term   180 days 180 days              
Bridge Loan                    
Debt Instrument [Line Items]                    
Finance contract, borrowing base                 $ 190,000,000 $ 190,000,000
Barclays Bank | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Finance contract, borrowing base $ 70,000,000.0             $ 40,000,000.0    
Debt instrument, basis spread on variable rate 0.85%                  
European Investment Bank                    
Debt Instrument [Line Items]                    
Finance contract, borrowing base       $ 104,800,000 € 90.0 $ 116,400,000 € 100.0