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Nature Of Operations And Significant Accounting Policies (Summary Of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 7.2 $ 7.3 $ 4.7
Provision for Loan, Lease, and Other Losses 1.1 2.2 6.1
Financing Receivable, Allowance for Credit Losses, Write-downs (0.7) (2.3) (3.5)
Balance at end of year $ 7.6 $ 7.2 $ 7.3