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Long-Term Debt And Notes Payable (Capitalization Of Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Disclosure [Abstract]    
Short-term borrowings $ 0.0 $ 49.6
Long-term debt 745.3 744.6
Total indebtedness 745.3  
Total shareholders' equity 1,133.8 $ 1,139.4
Capitalization $ 1,879.1  
Total indebtedness to capitalization 0.40