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Fair Value Measurements (Notes) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Disclosures | Fair Value Measurements Authoritative guidance for fair value measurements establishes a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
Level 1 |  | Unadjusted quoted prices in active markets for identical assets or liabilities. An active market for the asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
Level 2 |  | Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3 |  | Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
Financial Instruments that are Measured at Fair Value on a Recurring Basis We primarily apply the market approach to determine the fair value of financial instruments that are measured at fair value on a recurring basis. There were no changes to our valuation techniques used to determine the fair value of financial instruments during 2017 as compared to the prior year. The following tables present information about our financial instruments measured at fair value on a recurring basis as of December 31, 2017 and 2016, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.
| 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 |  |  |
| December 31, 2016 |  | Balance Sheet Classification
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 440.8 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 440.8 |  |  | Cash and cash equivalents
Liabilities |  |  |  |  |  |  |  |  |
Contingent acquisition obligations 1 | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 205.4 |  |  | $ | 205.4 |  |  |
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 decrease in this balance of $58.4 from December 31, 2016 to December 31, 2017 is primarily due to payments of $105.3, partially offset by acquisitions and exercised put options of $40.8. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.
Financial Instruments that are not Measured at Fair Value on a Recurring Basis The following table presents information about our financial instruments that are not measured at fair value on a recurring basis as of December 31, 2017, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Total long-term debt | $ | 0.0 |  |  | $ | 1,296.4 |  |  | $ | 46.2 |  |  | $ | 1,342.6 |
Our long-term debt is comprised of senior notes and other notes payable. The fair value of our senior notes, which are traded over-the-counter, is based on quoted prices in markets that are not active. Therefore, these senior notes are classified as Level 2 within the fair value hierarchy. Our other notes payable are not actively traded, and their fair value is not solely derived from readily observable inputs. The fair value of our other notes payable is determined based on a discounted cash flow model and other proprietary valuation methods, and therefore is classified as Level 3 within the fair value hierarchy. See Note 2 for further information on our long-term debt. Non-financial Instruments that are Measured at Fair Value on a Nonrecurring Basis Certain non-financial instruments are measured at fair value on a nonrecurring basis, primarily goodwill, intangible assets, and property and equipment. Accordingly, these assets are not measured and adjusted to fair value on an ongoing basis but are subject to periodic evaluations for potential impairment.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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