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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, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplemental executive retirement plan assets $ 42.8 $ 43.2
Total financial assets 42.8 43.2
Derivative Assets (Liabilities), at Fair Value, Net (32.7) (26.3)
Financial Liabilities Fair Value Disclosure (32.7) (26.3)
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 42.8 43.2
Total financial assets 42.8 43.2
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 (32.7) (26.3)
Financial Liabilities Fair Value Disclosure (32.7) (26.3)
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