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Fair Value Measurements | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The following fair value hierarchy table categorizes information regarding our financial assets and liabilities measured at fair value on a recurring basis (in millions):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
As of June 30, 2018 |  |  |  |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 30.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 30.5 |
Total financial assets | $ | 30.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 30.5 |
Derivatives, net | $ | — |  |  | $ | (6.5 | ) |  | $ | — |  |  | $ | (6.5 | )
Total financial liabilities | $ | — |  |  | $ | (6.5 | ) |  | $ | — |  |  | $ | (6.5 | )
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 30.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 30.9 |
Derivatives, net | — |  |  | 6.8 |  |  | — |  |  | 6.8 |
Total financial assets | $ | 30.9 |  |  | $ | 6.8 |  |  | $ | — |  |  | $ | 37.7 |
Supplemental Executive Retirement Plan Assets Our supplemental executive retirement plans (the "SERP") are non-qualified plans that provide eligible employees an opportunity to defer a portion of their compensation for use after retirement. Assets held in the SERP were marketable securities measured at fair value on a recurring basis using Level 1 inputs and were included in other assets on our condensed consolidated balance sheets. The fair value measurement of assets held in the SERP was based on quoted market prices. Derivatives Our derivatives are measured at fair value on a recurring basis using Level 2 inputs. See "Note 5 - Derivative Instruments" for additional information on our derivatives, including a description of our foreign currency hedging activities and related methodologies used to manage foreign currency exchange rate risk. The fair value measurement of our derivatives was based on market prices that are generally observable for similar assets or liabilities at commonly-quoted intervals. Other Financial Instruments The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):
| June 30, 2018 |  | December 31, 2017
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
8.50% Senior notes due 2019(1) | $ | — |  |  | $ | — |  |  | $ | 251.4 |  |  | $ | 252.9 |
6.875% Senior notes due 2020(2) | 128.9 |  |  | 128.3 |  |  | 477.9 |  |  | 473.1 |
4.70% Senior notes due 2021(2) | 112.6 |  |  | 110.7 |  |  | 267.1 |  |  | 265.3 |
3.00% Exchangeable senior notes due 2024(3) | 651.1 |  |  | 793.2 |  |  | 635.7 |  |  | 757.1 |
4.50% Senior notes due 2024 | 619.5 |  |  | 516.5 |  |  | 619.3 |  |  | 527.1 |
8.00% Senior notes due 2024 | 337.4 |  |  | 334.2 |  |  | 337.9 |  |  | 333.8 |
5.20% Senior notes due 2025 | 664.0 |  |  | 557.7 |  |  | 663.6 |  |  | 571.4 |
7.75% Senior notes due 2026 | 983.9 |  |  | 947.6 |  |  | — |  |  | — |
7.20% Debentures due 2027 | 149.3 |  |  | 136.9 |  |  | 149.3 |  |  | 141.9 |
7.875% Senior notes due 2040 | 375.9 |  |  | 270.6 |  |  | 376.7 |  |  | 258.8 |
5.75% Senior notes due 2044 | 972.3 |  |  | 709.5 |  |  | 971.8 |  |  | 690.4 |
Total | $ | 4,994.9 |  |  | $ | 4,505.2 |  |  | $ | 4,750.7 |  |  | $ | 4,271.8 |
(1) | Our senior notes due 2019 were redeemed in full in February 2018. See "Note 7 - Debt" for additional information.
(2) | The reduction in carrying value of our seniors notes due 2020 and senior notes due 2021 was attributable to repurchases and redemptions during the first quarter of 2018.
(3) | Our exchangeable senior notes due 2024 (the "2024 Convertible Notes") were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our condensed consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount that will be amortized to interest expense over the life of the instrument. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $835.1 million and $834.0 million as of June 30, 2018 and December 31, 2017, respectively.
The estimated fair values of our senior notes and debentures were determined using quoted market prices, which are level 1 inputs. The estimated fair values of our cash and cash equivalents, short-term investments, receivables, trade payables and other liabilities approximated their carrying values as of June 30, 2018 and December 31, 2017. Our short-term investments consisted of time deposits with initial maturities in excess of three months but less than one year as of each respective balance sheet date.

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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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