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Summary Of Significant Accounting Policies (Schedule Of Financial Instruments Where Carrying Value And Fair Value Differ) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term obligations, excluding capital leases $ 145.4
Quoted Prices In Active Markets For Identical Items (Level 1) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term obligations, excluding capital leases   
Significant Other Observable Inputs (Level 2) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term obligations, excluding capital leases 152.0
Significant Unobservable Inputs (Level 3) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term obligations, excluding capital leases