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Income Taxes Summary of Valuation Allowance (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Summary of Valuation Allowance [Table Text Block] | The change in the valuation allowance is listed below.
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Balance at beginning of period | $ | 255.6 |  |  | $ | 275.1 |  |  | $ | 332.2 |
Reversed to costs and expenses | (4.6 | ) |  | (15.4 | ) |  | (20.8 | )
(Reversed) charged to gross tax assets and other accounts 1 | (27.0 | ) |  | 9.5 |  |  | (9.2 | )
Foreign currency translation | 19.3 |  |  | (13.6 | ) |  | (27.1 | )
Balance at end of period | $ | 243.3 |  |  | $ | 255.6 |  |  | $ | 275.1 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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