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Debt and Credit Arrangements - Foreign Facilities (Details) - Revolving Credit Facility - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument    
Weighted average interest rate (percent)   4.80%
Foreign facilities    
Debt Instrument    
Maximum borrowing capacity $ 80,900,000  
Foreign facilities 200,000 $ 4,400,000
Letters of credit outstanding $ 44,000,000.0 $ 12,600,000