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Short Term Borrowings (Schedule of Weighted Average Daily Amounts of Borrowings Outstanding) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lines Of Credit Facility
Average Outstanding	$ 23.7	$ 28.3
Weighted Average Interest Rate	1.12%	1.55%
Notes Payable at Year-End	$ 13.0	$ 2.0
Weighted Average Interest Rate at Year-End	1.04%	1.04%

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Average amount borrowed under the credit facility during the period.

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