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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021
   $ 13.6      $ 2.4      $ 16.0  
Net change for tax positions of prior periods
     (0.2      0.6        0.4  
    
 
 
    
 
 
    
 
 
 
Closing balance at September 30
,
 2021
     13.4        3.0        16.4  
Current
     0.0        0.0        0.0  
    
 
 
    
 
 
    
 
 
 
Non-current
   $ 13.4      $ 3.0      $ 16.4