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