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Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Depreciation expense $ 53,500,000 $ 50,400,000 $ 63,400,000
Deferred costs 24,300,000 400,000  
Amortized costs 3,500,000 300,000 200,000
Environmental remediation, compliance and management expenses 12,400,000 8,000,000 8,300,000
Accrued liability relating to environmental remediation 4,200,000 2,100,000  
Capitalized maintenance cost 9,800,000 0  
Amortization of deferred maintenance cost $ 3,100,000 $ 3,300,000 $ 7,000,000