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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation Allowances and Reserves, Beginning Balance |  | $ 1.5 | $ 1.5 | $ 1.4
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 1.6 | 2.6 | 2.5
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | 1.4 | 2.6 | 2.4
Valuation Allowances and Reserves, Ending Balance |  | $ 1.7 | $ 1.5 | $ 1.5
[1] | Uncollectible accounts receivable written off, net of recoveries.

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