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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 25.1 $ 27.2
Total Financial Assets 25.1 27.2
Derivatives, net  7.9 10.7
Total financial liabilities 7.9 10.7
Quoted Prices In Active Markets For Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets 25.1 27.2
Total Financial Assets 25.1 27.2
Derivatives, net  0.0 0.0
Total financial liabilities 0.0 0.0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets 0.0 0.0
Total Financial Assets 0.0 0.0
Derivatives, net  7.9 10.7
Total financial liabilities 7.9 10.7
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets 0.0 0.0
Total Financial Assets 0.0 0.0
Derivatives, net  0.0 0.0
Total financial liabilities $ 0.0 $ 0.0