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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