Employee benefit plans - Components of net periodic benefit cost (Details) - Pension defined benefit plans - EUR (€) € in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined benefit pension plans
Current service cost	€ 7,634	€ 5,427	€ 22,539	€ 19,059
Net interest cost	3,507	3,307	10,424	9,755
Net periodic benefit costs	€ 11,141	€ 8,734	€ 32,963	€ 28,814

Amount of interest expense recognized related to defined benefit plan.

No definition available.

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- Definition

Amount of service cost expense recognized related to defined benefit plan.

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 5
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Details

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