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Consulting Contracts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Consulting Contracts [Line Items]
Technology consulting contract price			$ 9.6	$ 1.5
Revenues under consulting agreements	0.1	0.8			0.8	1.2
Unbilled revenue	2.9				2.9		2.1
Other current assets [Member]
Consulting Contracts [Line Items]
Unbilled revenue	2.0				2.0		1.4
Other assets [Member]
Consulting Contracts [Line Items]
Unbilled revenue	$ 0.9				$ 0.9		$ 0.7

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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