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Income Taxes Schedule of Deferred Tax Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The components of deferred tax assets and liabilities are listed below.
| December 31,
| 2017 |  | 2016
Postretirement/post-employment benefits | $ | 19.5 |  |  | $ | 23.1 |
Deferred compensation | 91.7 |  |  | 192.4 |
Pension costs | 27.6 |  |  | 36.6 |
Basis differences in fixed assets | (52.0 | ) |  | (80.2 | )
Rent | 27.5 |  |  | 41.7 |
Interest | 45.8 |  |  | 58.9 |
Accruals and reserves | 18.4 |  |  | 17.2 |
Allowance for doubtful accounts | 10.2 |  |  | 13.3 |
Basis differences in intangible assets | (281.3 | ) |  | (405.0 | )
Investments in equity securities | (3.3 | ) |  | (6.3 | )
Tax loss/tax credit carry forwards | 357.9 |  |  | 354.6 |
Prepaid expenses | (1.7 | ) |  | (2.9 | )
Deferred revenue | (38.2 | ) |  | (32.0 | )
Other | 44.7 |  |  | 44.3 |
Total deferred tax assets, net | 266.8 |  |  | 255.7 |
Valuation allowance | (243.3 | ) |  | (255.6 | )
Net deferred tax assets | $ | 23.5 |  |  | $ | 0.1 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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