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Derivatives and Hedging (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]    
Aggregate notional value of foreign exchange forward and swap arrangements $ 574.5 $ 204.0
Fair values included in other assets 0.8 5.5
Fair values included in other liabilities 12.9 0.8
QIAGEN Euro Finance [Member]
   
Derivative [Line Items]    
Cash-flow hedges notional amount   120.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value   0.7
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value   $ 1.7