Acquisition of Liberty Dialysis Holdings - Pro Forma (Details) (LibertyAcquisitionProForma [Member], USD $)	3 Months Ended
Mar. 31, 2012
LibertyAcquisitionProForma [Member]
Pro Forma [Line Items]
Pro forma net revenue	$ 3,361,638,000
Pro forma net income attributable to the shareholders of FMC-AG & co. KGaA	263,307,000
Basic	0.87
Fully diluted	$ 0.86

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration