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Significant Accounting and Reporting Policies Allowance for Doubtful Accounts (Tables)
6 Months Ended
Jun. 30, 2021
Allowance for Doubtful Accounts [Abstract]  
Accounts Receivable, Allowance for Credit Loss
The following is a rollforward of the allowance for doubtful accounts for the periods presented:
 Six Months Ended June 30,
20212020
Beginning Balance$26.6 $19.0 
Provision for losses on trade accounts receivable0.6 10.3 
Write-offs, net of recovered accounts(2.4)(3.4)
Ending balance$24.8 $26.0