Earnings per share (Details) - EUR (€)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Numerators:
Net income attributable to shareholders of FMC-AG & Co. KGaA	€ 270,749,000	€ 278,555,000
Denominators:
Weighted average number of shares outstanding	306,659,364	306,453,070
Potentially dilutive shares	0	986,454
Basic earnings per share (in dollars per share)	€ 0.88	€ 0.91
Fully diluted earnings per share (in dollars per share)	€ 0.88	€ 0.91

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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