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Debt and Credit Arrangements - Foreign Facilities (Details) - Foreign facilities - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument    
Foreign facilities $ 4.4 $ 11.2
Revolving Credit Facility    
Debt Instrument    
Line of credit remaining borrowing amount 23.1 65.6
Letter of credit outstanding $ 12.6 $ 17.1
Debt instrument weighted average interest rate (percent) 1.30% 4.80%