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Schedule II (Tables) | 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 [Table Text Block] | SCHEDULE II - Valuation and Qualifying Accounts
|  | Additions |  |
Description | Balance at Beginning of Period | Charged to Costs and Expenses | Deductions (A) | Balance at End of Period
(In millions)
Balance at December 31, 2018 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.5 |  | $ | 3.4 |  | $ | 3.2 |  | $ | 1.7 |
Balance at December 31, 2019 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.7 |  | $ | 2.2 |  | $ | 2.4 |  | $ | 1.5 |
Balance at December 31, 2020 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.5 |  | $ | 3.0 |  | $ | 1.9 |  | $ | 2.6 |
(A)Uncollectible accounts receivable written off, net of recoveries.

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