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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block] |
Allowance for Doubtful Accounts and Revenue Adjustments for the Years Ended: |  | Balance at Beginning of Year |  |  | Charged to Expense/ Against Revenue |  |  | Write-Offs, Net of Recoveries |  |  | Balance at End of Year |
December 31, 2014 |  | $ | 8.1 |  |  | $ | 19.0 |  |  | $ | (17.6 | ) |  | $ | 9.5 |
December 31, 2015 |  |  | 9.5 |  |  |  | 9.5 |  |  |  | (9.1 | ) |  |  | 9.9 |
December 31, 2016 |  |  | 9.9 |  |  |  | 19.5 |  |  |  | (16.0 | ) |  |  | 13.4 |

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