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Schedule II - Valuation And Qualifying Accounts | 12 Months Ended
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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, 2019 |  | 7.0 |  |  | 2.2 |  |  | (1.3) |  |  | 7.9 |
Year Ended December 31, 2018 |  | 6.2 |  |  | 2.0 |  |  | (1.2) |  |  | 7.0 |
(1) Primarily includes write-offs of uncollectible accounts.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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