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Tax on Profit/(Loss) for the Year and Deferred Tax - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Major components of tax expense (income) [abstract]
Income taxes refund	€ 0.7	€ 0.7	€ 0.7
Tax losses carryforwards	1,985.0	1,437.0
Additional tax deductions, determined by annual warrants exercises by employees	€ 5.2	€ 4.8	€ 16.3

X

- Definition

Additional tax deduction.

+ References

No definition available.

+ Details

Name:	asnd_AdditionalTaxDeduction
Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax Losses Carryforwards.

+ References

No definition available.

+ Details

Name:	asnd_TaxLossesCarryforwards
Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash flows from income taxes paid or refunded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration