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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
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Supplemental executive retirement plan assets $ 30.9 $ 27.7
Derivative Asset 6.8  
Total financial assets 37.7 27.7
Derivative Assets (Liabilities), at Fair Value, Net   (8.8)
Financial Liabilities Fair Value Disclosure 0.0 (8.8)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Supplemental executive retirement plan assets 30.9 27.7
Derivative Asset 0.0  
Total financial assets 30.9  
Derivative Assets (Liabilities), at Fair Value, Net   0.0
Financial Liabilities Fair Value Disclosure 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Supplemental executive retirement plan assets 0.0 0.0
Derivative Asset 6.8  
Total financial assets 6.8 0.0
Derivative Assets (Liabilities), at Fair Value, Net   (8.8)
Financial Liabilities Fair Value Disclosure 0.0 (8.8)
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Supplemental executive retirement plan assets 0.0 0.0
Derivative Asset 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 $ 0.0