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Long-Term Debt And Notes Payable (Capitalization Of Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]    
Current maturities of long-term debt $ 6.9 $ 249.4
Long-term debt 942.3 494.1
Total indebtedness 949.2  
Total shareholders' equity 1,524.2 $ 1,345.2
Capitalization $ 2,473.4  
Total indebtedness to capitalization 0.38