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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II – Valuation and Qualifying Accounts (in millions)
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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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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