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Income Taxes - Narrative (Details)
₩ in Millions, kr in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Jan. 01, 2018
Aug. 31, 2021
USD ($)
Aug. 31, 2021
KRW (₩)
May 31, 2021
USD ($)
May 31, 2021
KRW (₩)
Apr. 30, 2021
USD ($)
Apr. 30, 2021
DKK (kr)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
DKK (kr)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
KRW (₩)
Income Tax Contingency [Line Items]                              
Effective income tax rate                 25.80% 25.80% 32.20% 23.70% 30.20%    
Provision for income taxes                 $ 25.8   $ 52.1 $ 56.2 $ 55.9    
Provisional undistributed accumulated earnings of foreign subsidiary                 976.5            
Foreign withholding tax, if undistributed earnings are no reinvested indefinitely                 214.8            
Accumulated foreign earnings deemed repatriated                 1,500.0            
Provisional estimate of the associated foreign withholding and state income tax effects                 10.6            
Net operating losses                 402.5   418.2        
Deferred tax asset                 45.9   57.4        
Valuation allowance                 39.7   48.0        
Valuation allowance, deferred tax asset for NOLs                 35.7            
Increase (decrease) in additional liabilities related to unrecognized tax liabilities                 (3.1)   12.2        
Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense                 (1.6)            
Increase (decrease) in addition unrecognized tax liabilities related to a foreign currency translation expense                 (3.8)   4.0        
Unrecognized tax liabilities                 98.2   99.0        
Unrecognized tax assets                 23.9   25.4        
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor                 $ 51.2            
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)                 51.20% 51.20%          
Amount of unrecognized income tax liabilities may decrease within the next twelve months                 $ 4.2            
Interest related to unrecognized tax benefits, recorded as expense                 2.6   3.1 4.6      
Penalties related to unrecognized tax benefits, recorded as income tax expense (income)                 (0.3)   0.2 $ (0.2)      
Accrued interest related to unrecognized tax benefits                 18.8   16.2        
Accrued penalties related to unrecognized tax benefits                 4.3   $ 4.6        
Inland Revenue, Singapore (IRAS)                              
Income Tax Contingency [Line Items]                              
Period applicable for additional special income tax concession   5 years                          
Foreign Tax Authority | Danish Tax Authority | Tax Year 2013                              
Income Tax Contingency [Line Items]                              
Estimated tax                 0.6 kr 3.7          
Foreign Tax Authority | Danish Tax Authority | Tax Year 2014                              
Income Tax Contingency [Line Items]                              
Estimated tax                 $ 0.8 kr 4.9          
Foreign Tax Authority | Danish Tax Authority | Tax Year 2015                              
Income Tax Contingency [Line Items]                              
Estimated tax             $ 14.7 kr 96.1              
Foreign Tax Authority | Tax Authority, South Korea (SRTO)                              
Income Tax Contingency [Line Items]                              
Estimated tax     $ 9.0 ₩ 10,600.0 $ 9.0 ₩ 10,600.0                  
Foreign Tax Authority | Tax Authority, South Korea (SRTO) | Tax Year 2011 To 2014                              
Income Tax Contingency [Line Items]                              
Estimated tax                           $ 9.5 ₩ 11,300.0
Disposal Group, Not Discontinued Operations | Multi Service Payment Solutions                              
Income Tax Contingency [Line Items]                              
Provision for income taxes $ 12.9