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Income Taxes - Narrative (Details) $ / shares in Units, kr in Millions, $ in Millions, ₩ in Billions			3 Months Ended				9 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2020 DKK (kr)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2019 DKK (kr)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2017 KRW (₩)
Income Taxes [Line Items]
Income tax provision			$ 25.4	$ 21.5			$ 49.0	$ 55.5
Effective income tax rate			24.00%	30.00%			30.00%	31.00%
Effective income tax rate reconciliation, disposition of business amount			$ 16.1				$ 16.1
Effective income tax rate reconciliation, amount other adjustments, amount			2.7				7.1
Adjustment for discrete tax expense (benefit), prior year foreign tax return				$ 1.3				$ (3.3)
Decrease in foreign income tax			$ 0.0	$ 2.0			$ 1.5	$ 3.5
Basic earnings per common share (in dollars per share) | $ / shares			$ 0.00	$ 0.03			$ 0.02	$ 0.05
Diluted earnings per common share (in dollars per share) | $ / shares			$ 0.00	$ 0.03			$ 0.02	$ 0.05
Tax Authority, South Korea (SRTO)
Income Taxes [Line Items]
Income tax assessment notice, amount									$ 9.7	₩ 11.3
2013 Tax Year | Danish Tax Authority | Foreign Tax Authority
Income Taxes [Line Items]
Proposed income adjustment					$ 1.8	kr 11.2
2014 Tax Year | Danish Tax Authority | Foreign Tax Authority
Income Taxes [Line Items]
Proposed income adjustment	$ 1.4	kr 8.6

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