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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Summary of Accounts Receivable, Allowance for Expected Credit Losses
The following table sets forth activities in our allowance for expected credit losses (in millions):
20212020
Balance as of January 1,$57.3 $46.6 
Charges to allowance for credit losses2.4 34.6 
Write-off of uncollectible receivables(21.2)(32.9)
Recoveries of credit losses1.1 0.4 
Translation adjustments0.1 (0.1)
Balance as of June 30,$39.8 $48.6