Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012 Foreign exchange derivative instruments [Member]	Dec. 31, 2011 Foreign exchange derivative instruments [Member]	Jun. 30, 2012 Senior Notes [Member] Interest rate swaps [Member]	Jun. 30, 2011 Senior Notes [Member] Interest rate swaps [Member]	Jun. 30, 2012 Borrowings [Member] Interest rate swaps [Member]	Jun. 30, 2011 Borrowings [Member] Interest rate swaps [Member]
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Debt instrument outstanding	$ 0	$ 0	$ 30.0	$ 30.0	$ 33.0	$ 33.0
Interest Rate			5.60%	5.60%	3.30%	3.30%

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

No definition available.

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant