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Financing (Capitalization Of Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Disclosure [Abstract]    
Short-term borrowings $ 375.7 $ 149.4
Long-term debt 842.9 842.0
Total indebtedness 1,218.6  
Total shareholders' equity 1,528.9 $ 1,473.7
Capitalization $ 2,747.5  
Total indebtedness to capitalization 0.444