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Income Taxes - Narrative (Details) $ / shares in Units, ₩ in Millions, kr in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Jan. 01, 2018 | Jan. 31, 2021 USD ($) | Jan. 31, 2021 DKK (kr) | Dec. 31, 2016 KRW (₩) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 KRW (₩)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  | 32.20% | 23.70% | 30.20% | (707.10%) | (707.10%)
Provision for income taxes |  |  |  |  |  | $ 52.1 | $ 56.2 | $ 55.9 | $ 149.2 |
Transition tax toll charge on historic accumulated foreign earnings |  |  |  |  |  |  |  | 143.7 |  |
Provisional undistributed accumulated earnings of foreign subsidiary |  |  |  |  |  | 963.6 |  |  |  |
Foreign withholding tax, if undistributed earnings are no reinvested indefinitely |  |  |  |  |  | 212.0 |  |  |  |
Accumulated foreign earnings deemed repatriated |  |  |  |  |  | 1,400.0 |  |  |  |
Provisional estimate of the associated foreign withholding and state income tax effects |  |  |  |  |  | 10.4 |  |  |  |
Net operating losses |  |  |  |  |  | 418.2 | 375.9 |  |  |
Deferred tax asset |  |  |  |  |  | 57.4 | 40.1 |  |  |
Valuation allowance |  |  |  |  |  | 48.0 | 32.5 |  |  |
Valuation allowance, deferred tax asset for NOLs |  |  |  |  |  | 42.2 |  |  |  |
Period applicable for additional special income tax concession |  | 5 years |  |  |  |  |  |  |  |
Decrease in foreign income tax |  |  |  |  |  | $ 2.4 | $ 4.3 | $ 0.0 |  |
Basic earnings per common share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.04 | $ 0.07 | $ 0 |  |
Diluted earnings per common share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.04 | $ 0.06 | $ 0 |  |
Increase (decrease) in additional liabilities related to unrecognized tax liabilities |  |  |  |  |  | $ 12.2 | $ 9.5 |  |  |
Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense |  |  |  |  |  | 4.0 | 0.2 |  |  |
Unrecognized tax liabilities |  |  |  |  |  | 99.0 | 84.0 |  |  |
Unrecognized tax assets |  |  |  |  |  | 25.4 | 25.5 |  |  |
Increase (decrease) in assets related to unrecognized tax assets |  |  |  |  |  |  | (4.1) |  |  |
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor |  |  |  |  |  | $ 52.7 |  |  |  |
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) |  |  |  |  |  | 32.80% |  |  |  |
Amount of unrecognized income tax liabilities may decrease within the next twelve months |  |  |  |  |  | $ 5.4 |  |  |  |
Interest related to unrecognized tax benefits, recorded as income (expense) |  |  |  |  |  | 3.1 | 4.6 | $ 1.2 |  |
Penalties related to unrecognized tax benefits, recorded as income tax income (expense) |  |  |  |  |  | (0.2) | 0.2 | $ 1.9 |  |
Accrued interest related to unrecognized tax benefits |  |  |  |  |  | 16.2 | 13.1 |  |  |
Accrued penalties related to unrecognized tax benefits |  |  |  |  |  | $ 4.6 | $ 4.4 |  |  |
South Korea (SRTO) | Assessment |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-assessment notice, amount | ₩ |  |  |  |  | ₩ 11,700.0 |  |  |  |  |
Foreign Tax Authority | Danish Tax Authority | Tax Year 2013 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  | $ 0.6 | kr 3.7 |  |  |  |  |  |
Foreign Tax Authority | Danish Tax Authority | Tax Year 2014 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  | $ 0.8 | kr 4.9 |  |  |  |  |  |
Foreign Tax Authority | South Korea (SRTO) | Assessment |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-assessment notice, amount |  |  |  |  |  |  |  |  | $ 10.4 | ₩ 11,300.0
Without transition tax toll charge |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  |  |  | (25.90%) |  |
Disposal Group, Not Discontinued Operations | Multi Service Payment Solutions |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for income taxes | $ 12.9 |  |  |  |  |  |  |  |  |

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