Share-based compensation - Outstanding options (Detail)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016
EUR [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	2,772,210
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 33.4
Weighted average remaining contractual life of outstanding share options	3.0
USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	3,309,766
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 31.1
Weighted average remaining contractual life of outstanding share options	2.5
Price range one [Member] \| EUR [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	1,013,941
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 17.4
Weighted average remaining contractual life of outstanding share options	3.7
Price range one [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	993,732
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 18.8
Weighted average remaining contractual life of outstanding share options	3.6
Price range two [Member] \| EUR [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	27,042
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 0.4
Weighted average remaining contractual life of outstanding share options	4.0
Price range two [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	42,728
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 0.7
Weighted average remaining contractual life of outstanding share options	3.4
Price range three [Member] \| EUR [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	1,731,227
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 15.6
Weighted average remaining contractual life of outstanding share options	2.6
Price range three [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	860,950
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 7.0
Weighted average remaining contractual life of outstanding share options	3.3
Price range four [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	834,242
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 3.8
Weighted average remaining contractual life of outstanding share options	1.9
Price range five [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	578,114
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested	€ 0.7
Weighted average remaining contractual life of outstanding share options	0.3
Option plans [Member] \| EUR [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	2,772,210	7,052,065
Weighted average remaining contractual life of outstanding share options	3.0
Option plans [Member] \| USD [Member]
Disclosure of range of exercise prices of outstanding share options [Line items]
Number of outstanding share options	3,309,766	7,725,221

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.

No definition available.

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- Definition

The intrinsic value of liabilities arising from share-based transactions for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). The intrinsic value is the difference between the fair value of the shares to which the counterparty has the (conditional or unconditional) right to subscribe, or which it has the right to receive, and the price (if any) that the counterparty is (or will be) required to pay for those shares. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services, for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 51
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_b_ii&doctype=Standard
-URIDate 2017-03-09

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- Definition

The number of share options outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard
-URIDate 2017-03-09

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- Definition

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

+ References

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