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Income tax - Additional Information (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Dec. 31, 2017	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	€ 75.4	€ 60.2	€ 51.0
Deferred tax rate	25.80%	26.50%	25.49%
Unused tax losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses	€ 14.0	€ 59.6	€ 49.6
FRANCE | Unused tax losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset)	€ 284.0	€ 235.0	€ 184.3
UNITED STATES | Unused tax losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liability (asset) | $					$ 3.4	$ 4.4	$ 4.8
Expiration period				20 years

X

- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph g
-Clause i
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-URIDate 2021-03-24

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- Definition

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+ References

No definition available.

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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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- Definition

Company Deferred Tax Rate

+ References

No definition available.

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- Definition

Unused Tax Loss Expiration Period

+ References

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