Property And Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense, including amortization of internal use software	$ 3.0	$ 2.9	$ 6.0	$ 5.6
Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Capitalized software development costs			6.7
Amortization expense	2.2	2.0	4.3	3.8
Unamortized software development costs	$ 22.0		$ 22.0