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Income Taxes (Details) kr in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 DKK (kr)	Sep. 30, 2020	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Dec. 31, 2020 USD ($)
Income Tax Examination [Line Items]
Effective income tax provision (as a percent)	24.90%	24.90%	25.20%	24.30%	26.50%
Danish Tax Authority (SKAT) | Foreign Tax Authority
Income Tax Examination [Line Items]
Tax deposit paid	$ 1.5	kr 9.8
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years Post 2011
Income Tax Examination [Line Items]
Deferred tax assets	12.7			$ 12.7		$ 12.0
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Year 2015
Income Tax Examination [Line Items]
Tax deposit paid	15.1	97.2
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2012 - 2014
Income Tax Examination [Line Items]
Tax deposit paid	$ 32.9	kr 210.8

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Income Tax Examination, Tax Deposit, Amount Paid

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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