Guarantees (Details Textual) In Millions, unless otherwise specified	Mar. 31, 2012 USD ($)	Mar. 31, 2012 GBP (£)
Guarantees (Textual) [Abstract]
Guarantor on revolving credit agreement between JV and financial institution		£ 35
Notional Value of the forward contracts of the JV	129.3
Fair value assets measured on recurring basis, Derivative financial instruments assets	$ 4.4
Percentage of gains/losses resulting from foreign exchange hedges, indemnified	50.00%	50.00%