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Fair Value Measurements Fair Value of Assets and Liabilities Measured on a Recurring Basis (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following tables present information about our financial instruments measured at fair value on a recurring basis as of December 31, 2018 and 2017, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.
| December 31, 2018 |  | Balance Sheet Classification
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 132.1 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 132.1 |  |  | Cash and cash equivalents
Liabilities |  |  |  |  |  |  |  |  |
Contingent acquisition obligations 1 | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 148.4 |  |  | $ | 148.4 |  |  |
| December 31, 2017 |  | Balance Sheet Classification
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 201.6 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 201.6 |  |  | Cash and cash equivalents
Liabilities |  |  |  |  |  |  |  |  |
Contingent acquisition obligations 1 | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 147.0 |  |  | $ | 147.0 |  |  |
1 | Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The increase in this balance of $1.4 from December 31, 2017 to December 31, 2018 is primarily due to acquisitions and exercised put options of $61.8, partially offset by payments of $54.0. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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