Summary Of Significant Accounting Policies (Schedule Of Financial Instruments Where Carrying Value And Fair Value Differ) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term obligations, excluding capital leases	$ 136.9
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	142.0
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