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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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