Restructuring Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	$ 8.0
Stock Based Compensation Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	16.2
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	$ 21.3