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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
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 29.4 $ 27.7
Total financial assets 34.3 27.7
Derivatives, net 4.9 (8.8)
Total financial liabilities   (8.8)
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 29.4 27.7
Total financial assets 29.4 27.7
Derivatives, net 0.0 0.0
Total financial liabilities   0.0
Significant Other Observable 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
Total financial assets 4.9 0.0
Derivatives, net 4.9 (8.8)
Total financial liabilities   (8.8)
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
Total financial assets 0.0 0.0
Derivatives, net $ 0.0 0.0
Total financial liabilities   $ 0.0