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Schedule II
9 Months Ended
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
SCHEDULE II - Valuation and Qualifying Accounts
Additions
DescriptionBalance at Beginning of PeriodCharged to Costs and ExpensesDeductions (A)Balance at End of Period
(In millions)
Balance at December 31, 2019
Reserve for Uncollectible Accounts$1.7 $2.2 $2.4 $1.5 
Balance at December 31, 2020
Reserve for Uncollectible Accounts$1.5 $3.0 $1.9 $2.6 
Balance at December 31, 2021
Reserve for Uncollectible Accounts$2.6 $3.2 $3.4 $2.4 
(A)Uncollectible accounts receivable written off, net of recoveries.