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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 PreAnalytiX GmbH [Member]	Dec. 31, 2012 QIAGEN Finance [Member]	Aug. 31, 2004 QIAGEN Finance [Member]	Dec. 31, 2012 QIAGEN Euro Finance [Member]	Dec. 31, 2012 Scandinavian Gene Synthesis AB [Member]	Dec. 31, 2011 Scandinavian Gene Synthesis AB [Member]	Dec. 31, 2012 Pyrobett	Dec. 31, 2010 Pyrobett	May 31, 2006 Convertible Notes 3.25% Due in 2026 [Member] QIAGEN Euro Finance [Member]
Investment [Line Items]
Ownership percentage			50.00%	100.00%		100.00%	40.00%		19.00%
Convertible debt					$ 150.0						$ 300.0
Stated interest rates					1.50%						3.25%
Investment made in company	15.5	6.8								4.0
Cost-method Investments, Other than Temporary Impairment	3.4
Payments to Acquire Equity Method Investments								9.7
Advance Payment, Equity Method Investment, Additional Shares Acquisition Option								6.7
Equity Method Investment Acquisition Option Percent							60.00%
Business Combination Step Acquisition Equity Interest in Acquiree Payment							$ 8.4

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The advance payment made on an equity method investment with an option to purchase additional equity shares. This amount is refundable if the acquisition option is not exercised.

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The percent of equity method investment not owned by the entity but has the option to acquire.

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This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign.

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