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Debt - Summary of Long-Term Debt (Parenthetical) (Details) - EUR (€) | Dec. 31, 2020 | Jun. 22, 2018
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Notes due June 2026 |  |
Debt Instrument [Line Items] |  |
Principal amount | € 500,000,000.0 | € 500,000,000.0
€400 due September 2022 |  |
Debt Instrument [Line Items] |  |
Principal amount | € 400,000,000.0 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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