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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation Allowances and Reserves, Beginning Balance |  | $ 1.7 | $ 1.5 | $ 1.5
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 2.2 | 3.4 | 2.6
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | 2.4 | 3.2 | 2.6
Valuation Allowances and Reserves, Ending Balance |  | $ 1.5 | $ 1.7 | $ 1.5
[1] | Uncollectible accounts receivable written off, net of recoveries.

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