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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reserve for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, Beginning of Year | $ 85.7 | $ 65.7 | $ 41.9
Charged to Costs and Expenses | 71.4 | 22.1 | 22.1
Charged to Other Comprehensive Income | 0.0 | 0.0 | 0.0
Write-offs | (74.2) | (2.1) | 1.7
Balance, End of Year | 82.9 | 85.7 | 65.7
Deferred tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, Beginning of Year | 272.0 | 286.4 | 262.0
Charged to Costs and Expenses | (8.8) | (17.0) | 27.8
Charged to Other Comprehensive Income | (1.8) | 2.6 | (3.4)
Write-offs | 0.0 | 0.0 | 0.0
Balance, End of Year | $ 261.4 | $ 272.0 | $ 286.4

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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=26873400&loc=d3e24092-122690 + Details
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