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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at end of year | $ 4.3 |  |
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 5.9 | $ 6.7 | $ 6.3
Additions charged to cost and expenses | 4.8 | 3.9 | 2.4
Write-offs | (3.7) | (5.6) | (2.7)
Recoveries | 0.6 | 0.9 | 0.9
Other | (1.3) | 0.0 | (0.2)
Balance at end of year | $ 6.3 | $ 5.9 | $ 6.7

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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