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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
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, 2020$100.7 
Additions for tax positions9.5 
Reductions for tax positions(0.1)
Balance at March 31, 2021$110.1