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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, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 30.1 $ 30.9
Derivative Assets (Liabilities), at Fair Value, Net 5.8 6.8
Total financial assets 35.9 37.7
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 30.1 30.9
Derivative Assets (Liabilities), at Fair Value, Net 0.0 0.0
Total financial assets 30.1 30.9
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 5.8 6.8
Total financial assets 5.8 6.8
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
Derivative Assets (Liabilities), at Fair Value, Net 0.0 0.0
Total financial assets $ 0.0 $ 0.0