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Income Taxes - Balance Sheet Location (Details) - Foreign Tax Authority - Danish Tax Authority (SKAT) - Tax Years Post 2011 kr in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |
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Jun. 30, 2020 DKK (kr) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 DKK (kr) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Income Tax Examination [Line Items] |  |  |  |  |  |
Income tax liability | kr 1,121.1 | $ 169.1 | kr 1,110.6 | $ 166.7 |  |
Tax deposit | 1,104.1 |  | 970.1 |  | $ 166.5 | $ 145.6
Accrued expenses and other current liabilities |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Income tax liability | 847.3 | 127.8 | 847.3 | 127.2 |  |
Tax deposit | 847.3 |  | 847.3 |  | 127.8 | 127.2
Other noncurrent liabilities |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Income tax liability | 273.8 | $ 41.3 | 263.3 | $ 39.5 |  |
Other non-current assets |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Tax deposit | kr 256.8 |  | kr 122.8 |  | $ 38.7 | $ 18.4

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- Definition The sum of the amounts of estimated penalties and interest recognized in the period 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=84230637&loc=d3e32718-109319 + Details
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