Revenue - Contract Balances (Details) - EUR (€) € in Billions		12 Months Ended
Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue
Contract liabilities		€ 4.2	€ 4.4
Increases in contract liabilities mainly result from billing and invoices becoming due		8.5
Decreases in contract liabilities from satisfying performance obligations		€ 8.4
Revenue that was included in contract liability balance at beginning of period	€ 3.5		€ 2.6

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph a
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-URIDate 2020-01-01

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard
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- References

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2020-01-01

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Data Type:	xbrli:monetaryItemType
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- Definition

The increase in contract liabilities resulting from billing and invoices becoming due.

+ References

No definition available.

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Period Type:	duration