Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Selling, General, And Administrative Expenses [Member]	Mar. 31, 2012 Selling, General, And Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Percentage of weighted average cost of capital	15.30%
Severance and acceleration of equity awards contract obligations	$ 1.1	$ 1.5
Future contractual obligations to be recorded in second quarter of 2013	0.7
Net impact of quarterly re-evaluation and accretion of liability expenses			0.2	0.2
Savings in general and administrative costs	$ 2