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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2019
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
  $
13.4
    $
0.6
    $
14.0
 
Additions for tax positions of prior periods
   
0.0
     
0.9
     
0.9
 
                         
Closing balance at September 30
   
13.4
     
1.5
     
14.9
 
Current
   
0.0
     
0.0
     
0.0
 
                         
Non-current
  $
13.4
    $
1.5
    $
14.9