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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, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 32.7 $ 33.1
Derivative, Fair Value, Net 0.1  
Total financial assets 32.8 33.1
Derivative Assets (Liabilities), at Fair Value, Net   (19.7)
Financial Liabilities Fair Value Disclosure   (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 32.7 33.1
Derivative, Fair Value, Net 0.0  
Total financial assets 32.7 33.1
Derivative Assets (Liabilities), at Fair Value, Net   0.0
Financial Liabilities Fair Value Disclosure   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
Derivative, Fair Value, Net 0.1  
Total financial assets 0.1 0.0
Derivative Assets (Liabilities), at Fair Value, Net   (19.7)
Financial Liabilities Fair Value Disclosure   (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
Derivative, Fair Value, Net 0.0  
Total financial assets $ 0.0 0.0
Derivative Assets (Liabilities), at Fair Value, Net   0.0
Financial Liabilities Fair Value Disclosure   $ 0.0