Summary Of Significant Accounting Policies (Schedule Of Fair Values Of The Net Assets) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Derivative Counterparty [Line Items]
Total assets	$ 10.9
Canadian Imperial Bank of Commerce
Derivative Counterparty [Line Items]
Total assets	8.7
Bank of Montreal
Derivative Counterparty [Line Items]
Total assets	1.1
Scotiabank
Derivative Counterparty [Line Items]
Total assets	0.7
Bank of America Merrill Lynch
Derivative Counterparty [Line Items]
Total assets	$ 0.4