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Debt and Credit Arrangements - Foreign Facilities (Details) - Foreign facilities - Revolving Credit Facility - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument    
Foreign facilities $ 0.0 $ 4.4
Line of credit remaining borrowing amount 77.4 23.1
Letter of credit outstanding $ 47.7 $ 12.6
Debt instrument weighted average interest rate (percent)   1.30%