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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
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 29.3 $ 27.2
Derivative Assets (Liabilities), at Fair Value, Net (6.9) (10.7)
Total Financial Liabilities (6.9) (10.7)
Total financial assets 29.3 27.2
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets 29.3 27.2
Total financial assets 29.3 27.2
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets 0.0 0.0
Derivative Assets (Liabilities), at Fair Value, Net (6.9) (10.7)
Total Financial Liabilities (6.9) (10.7)
Total financial assets 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member]    
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