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Income Taxes - Balance Sheet Location (Details) kr in Millions, $ in Millions | Sep. 30, 2021 DKK (kr) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 DKK (kr) | Dec. 31, 2020 USD ($)
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Income Tax Examination [Line Items] |  |  |  |
Tax liability | kr 312.4 | $ 48.6 | kr 1,142.3 | $ 187.5
Tax deposit | 317.8 | 49.5 | 1,180.9 | 193.9
Accrued expenses and other current liabilities |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax liability | 0.0 | 0.0 | 847.3 | 139.1
Other noncurrent liabilities |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax liability | 312.4 | 48.6 | 295.0 | 48.4
Prepaid expenses and other current assets |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax deposit | 0.0 | 0.0 | 847.3 | 139.1
Other non-current assets |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax deposit | kr 317.8 | $ 49.5 | kr 333.6 | $ 54.8

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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