Commitments and Contingencies (Details) (Revolving Loans, USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Revolving Loans
Letters of Credit and Guarantees
Bank guarantees for customer advances	$ 131.9	$ 115.4

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant