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Supplementary Data Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Liabilities [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued Liabilities The following table presents the components of accrued liabilities.
| December 31,
| 2017 |  | 2016
Salaries, benefits and related expenses | $ | 441.7 |  |  | $ | 499.0 |
Office and related expenses | 53.2 |  |  | 46.7 |
Acquisition obligations | 42.0 |  |  | 77.5 |
Interest | 16.4 |  |  | 17.3 |
Other | 121.4 |  |  | 153.5 |
Total accrued liabilities | $ | 674.7 |  |  | $ | 794.0 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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