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Schedule II (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.6 |  | $ | 2.4 |  | $ | 2.6 |  | $ | 1.4 |
Balance at December 31, 2016 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.4 |  | $ | 2.5 |  | $ | 2.4 |  | $ | 1.5 |
Balance at December 31, 2017 |  |  |  |
Reserve for Uncollectible Accounts | $ | 1.5 |  | $ | 2.6 |  | $ | 2.6 |  | $ | 1.5 |
(A) | Uncollectible accounts receivable written off, net of recoveries.

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