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Supplementary Data Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts (Tables)
 12 Months Ended
Dec. 31, 2020
Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts [Abstract]  
Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable
Valuation and Qualifying Accounts – Accounts Receivable, Allowance for Expected Credit Losses
 Years ended December 31,
 202020192018
Balance at beginning of period$40.2 $42.5 $42.7 
Cumulative effect of accounting change 1
9.0 N/AN/A
Charges to costs and expenses50.5 10.1 6.5 
Adjustments:
Acquisitions/(dispositions)8.6 (0.3)2.2 
Uncollectible accounts written off(11.2)(11.9)(7.1)
Recoveries0.2 N/AN/A
Foreign currency translation adjustments1.0 (0.2)(1.8)
Balance at end of period$98.3 $40.2 $42.5