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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, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 28.3 $ 33.1
Total financial assets 28.3 33.1
Derivative Assets (Liabilities), at Fair Value, Net (4.3) (19.7)
Financial Liabilities Fair Value Disclosure (4.3) (19.7)
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 28.3 33.1
Total financial assets 28.3 33.1
Derivative Assets (Liabilities), at Fair Value, Net 0.0 0.0
Financial Liabilities Fair Value Disclosure 0.0 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 0.0 0.0
Derivative Assets (Liabilities), at Fair Value, Net (4.3) (19.7)
Financial Liabilities Fair Value Disclosure (4.3) (19.7)
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
Derivative Assets (Liabilities), at Fair Value, Net 0.0 0.0
Financial Liabilities Fair Value Disclosure $ 0.0 $ 0.0