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Debt and Credit Arrangements - Foreign Facilities (Details) - Revolving Credit Facility - Foreign facilities - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument    
Line of credit outstanding $ 4.5 $ 11.2
Line of credit remaining borrowing amount 31.8 65.6
Letters of credit outstanding $ 19.3 $ 17.1
Weighted average interest rate (percent) 3.30% 4.80%