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Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Short-term Debt [Line Items] |  |
Commercial paper weighted-average interest rate of 0.27% at December 31, 2020 | $ 0.0 | $ 503.0
Total short-term borrowings | $ 0.0 | $ 503.0
Commercial Paper |  |
Short-term Debt [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 0.27%

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