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Schedule II - Valuation And Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017
(dollars in millions)

Allowance for doubtful accounts:
 
Balance at
Beginning
of Period
 
Charged to
Costs and
Expenses
 
Deductions
 
Balance at
End of
Period
Year Ended December 31, 2019
 
$
7.0

 
$
2.2

 
$
(1.3
)
 
$
7.9

Year Ended December 31, 2018
 
6.2

 
2.0

 
(1.2
)
 
7.0

Year Ended December 31, 2017
 
5.9

 
2.1

 
(1.8
)
 
6.2