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Accounts Receivable and Allowance for Credit Losses (Tables)
9 Months Ended
Sep. 30, 2021
Receivables [Abstract]  
Schedule of Allowance for Credit Losses
Movements in the allowance for credit losses are as follows (in millions):

 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Beginning balance$2.3 $5.2 $3.8 $2.8 
Cumulative effect of ASC 326 adoption
— — — 1.1 
Provision (recoveries)0.4 (0.8)0.6 0.5 
Amounts reclassified to held for sale (1)— (0.6)— (0.6)
Write-offs(0.3)(0.1)(2.0)(0.1)
Ending balance$2.4 $3.7 $2.4 $3.7 

(1) Relates to the disposition of the Company’s emergency medical services (“EMS”) business in October 2020. The EMS business was classified as held for sale as of September 30, 2020.