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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 |  |  |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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