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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties
A roll-forward of unrecognized tax benefits and associated accrued interest and penalties is as follows:
 
(in millions)
  
Unrecognized

Tax Benefits
    
Interest and

Penalties
    
Total
 
Opening balance at January 1, 2022
   $ 13.2      $ 3.1      $ 16.3  
Net change for tax positions of prior periods
     (0.5      0.5        —    
    
 
 
    
 
 
    
 
 
 
Closing balance at September 30, 2022
     12.7        3.6        16.3  
Current
     —          —          —    
    
 
 
    
 
 
    
 
 
 
Non-current
   $ 12.7      $ 3.6      $ 16.3