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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation And Qualifying Accounts
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS
For the years ended 2020, 2019 and 2018
In millions
 
Column AColumn BColumn CColumn DColumn E
  Additions  
DescriptionBalance
Beginning
of Period		Charges or
(Reductions)
to Costs and
Expenses		Charges or
(Reductions)
to Other Accounts		Deductions
Balance at
End of Period(a)
Allowance for doubtful accounts, deducted from accounts receivable in the balance sheet:
Year Ended December 31, 201815.5 — 12.0 (b)(4.1)23.4 
Year Ended December 31, 201923.4 4.6 (6.8)(1.0)20.2 
Year Ended December 31, 202020.2 1.3 (0.2)(4.5)16.8 
Income tax valuation allowance, related to deferred income taxes
Year Ended December 31, 2018584.1 946.4 — — 1,530.5 
Year Ended December 31, 20191,530.5 (73.4)— — 1,457.1 
Year Ended December 31, 20201,457.1 (774.1)— — 683.0 
______________________________
(a)Allowance for doubtful accounts balance includes $16.3 million, $16.7 million, $22.1 million of allowance on long-term receivables recorded in Other Assets for the years ended December 31, 2020, 2019 and 2018, respectively.
(b)Amount relates to allowance of $12.0 million acquired in the Acquisition.