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Financing (Capitalization Of Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]    
Commercial paper and current maturities of long-term debt $ 149.4 $ 6.9
Long-term debt 842.0 942.3
Total indebtedness 991.4  
Total shareholders' equity 1,473.7 $ 1,524.2
Capitalization $ 2,465.1  
Total indebtedness to capitalization 0.402