Income Taxes (Schedule Of Reconciliation Of The Beginning And Ending Amounts Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Reconciliation Of The Beginning And Ending Amounts Of Unrecognized Tax Benefits [Line Items]
Unrecognized Tax Benefits-Opening Balance	$ 0.9	$ 24.4	$ 23.7
Gross increases-tax positions in prior period	2.6	0.4	0.0
Gross decreases-tax positions in prior period	(0.9)	(23.9)	(1.0)
Gross increases-current period tax positions	0.0	0.0	1.7
Unrecognized Tax Benefits-Ending Balance	2.6	0.9	24.4
Operating Loss Carryforwards	0.0	(0.9)	(24.2)
Balance-Net of Refunds and NOL Carryforwards	$ 2.6	$ 0.0	$ 0.2