Income Taxes (Details) $ / shares in Units, $ in Millions, ₩ in Billions		3 Months Ended			12 Months Ended
	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2017 KRW (₩)
Income Taxes [Line Items]
Income tax provision		$ 16.0		$ 14.0
Effective income tax rate		27.70%		27.30%
Adjustment for discrete tax expense (benefit), prior year foreign tax return		$ 1.0		$ 2.8
Decrease in foreign income tax		$ 2.0		$ 0.9
Basic earnings per common share (in dollars per share) | $ / shares		$ 0.03		$ 0.01
Diluted earnings per common share (in dollars per share) | $ / shares		$ 0.03		$ 0.01
Tax Authority, South Korea (SRTO)
Income Taxes [Line Items]
Income tax assessment notice, amount					$ 9.3	₩ 11.3
Pro forma
Income Taxes [Line Items]
Effective income tax rate		25.90%		32.80%
2013 Tax Year | Danish Tax Authority | Foreign Tax Authority
Income Taxes [Line Items]
Proposed income adjustment			$ 1.7
Subsequent Event | 2014 Tax Year | Danish Tax Authority | Foreign Tax Authority
Income Taxes [Line Items]
Proposed income adjustment	$ 5.2