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Schedule II - Valuation And Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation And Qualifying Accounts
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
Years ended December 31, 2020, 2019 and 2018
(dollars in millions)
Allowance for credit losses:Balance at
Beginning
of Period		Charged to
Costs and
Expenses
Deductions (1)
Balance at
End of
Period
Year Ended December 31, 2020$7.9 $30.9 $(9.2)$29.6 
Year Ended December 31, 20197.0 2.2 (1.3)7.9 
Year Ended December 31, 20186.2 2.0 (1.2)7.0 
(1)     Primarily includes write-offs of uncollectible accounts.