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Financial Instruments and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended
--- | --- | ---
Jan. 31, 2012 Tekmar | Mar. 31, 2013 Contingent consideration
Reconciliation of changes in fair value of all financial assets and liabilities |  |
Balance at the beginning of the period |  | $ 5.2
Total realized and unrealized gains (losses) included in Comprehensive income |  | (0.2)
Balance at the ending of the period |  | 5.0
Contingent liability of the acquisition date fair value | 5.1 |
Contingent liability in case of failure to meet the performance metrics | 0 |
Contingent liability in case of complete achievement of performance metrics | $ 8.2 |

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