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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Reconciliation of Liability for Uncertain Tax Positions
The following is a reconciliation of the liability for uncertain tax positions (in millions):
Balance at December 31, 2019$109.1  
Additions for tax positions10.1  
Reductions for tax positions(1.6) 
Balance at June 30, 2020$117.6