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Equity-Accounted Investees - Other equity method investees - Ownership and Carrying Amount (Details) - EUR (€) € in Thousands			1 Months Ended	12 Months Ended
	Oct. 22, 2018	May 17, 2016	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [line items]
Investments in equity-accounted investees				€ 114,473	€ 226,905		€ 219,009
Rest of equity accounted investees
Disclosure of associates [line items]
Investments in equity-accounted investees					79,616	€ 79,616
Investments in equity-accounted investees				€ 54,183	€ 226,905		219,009	€ 201,345
Alkahest, Inc.
Disclosure of associates [line items]
Ownership interest (as a percent)				47.58%	47.58%
Investments in equity-accounted investees				€ 14,708	€ 28,336
Albajuna Therapeutics, S.L.
Disclosure of associates [line items]
Ownership interest (as a percent)				49.00%	30.00%
Investments in equity-accounted investees				€ 5,228	€ 1,106
Singulex, Inc.
Disclosure of associates [line items]
Ownership interest (as a percent)		19.33%		0.00%	19.33%
Investments in equity-accounted investees					€ 19,256		29,322
GigaGen, Inc
Disclosure of associates [line items]
Ownership interest (as a percent)				43.96%	43.96%
Investments in equity-accounted investees				€ 23,997	€ 28,363		€ 29,047
Mecwins, S.A
Disclosure of associates [line items]
Ownership interest (as a percent)	24.99%			24.99%	24.99%
Investments in equity-accounted investees				€ 2,338	€ 2,555
Medcom Advance, S.A.
Disclosure of associates [line items]
Ownership interest (as a percent)			45.00%	45.00%
Investments in equity-accounted investees				€ 7,912

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- Definition

Investment accounted for using equity method adjusted for rest of equity accounted investees.

+ References

No definition available.

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

+ References

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