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FAIR VALUE MEASUREMENTS | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Fair value accounting rules provide a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are defined as follows: Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 – Pricing inputs are observable, either directly or indirectly, but are not quoted prices included within Level 1. Level 2 includes those financial instruments that are valued using external inputs within models or other valuation methods. Level 3 – Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methods that result in management's best estimate of fair value. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We use a mid-market pricing convention (the mid-point between bid and ask prices) as a practical measure for valuing certain derivative assets and liabilities. We primarily use a market approach for recurring fair value measurements and attempt to use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. When possible, we base the valuations of our financial assets and liabilities on quoted prices for identical assets and liabilities in active markets. These valuations are classified in Level 1. The valuations of certain contracts not classified as Level 1 may be based on quoted market prices received from counterparties and/or observable inputs for similar instruments. Transactions valued using these inputs are classified in Level 2. Certain derivatives are categorized in Level 3 due to the significance of unobservable or internally-developed inputs. We recognize transfers between levels of the fair value hierarchy at their value as of the end of the reporting period. The following tables summarize our financial assets and liabilities that were accounted for at fair value on a recurring basis, categorized by level within the fair value hierarchy:
|  | September 30, 2018
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 9.6 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 9.9 |
FTRs |  | — |  |  | — |  |  | 11.5 |  |  | 11.5 |
Coal contracts |  | — |  |  | 0.8 |  |  | — |  |  | 0.8 |
Interest rate swaps |  | — |  |  | 0.8 |  |  | — |  |  | 0.8 |
Total derivative assets |  | $ | 9.6 |  |  | $ | 1.9 |  |  | $ | 11.5 |  |  | $ | 23.0 |
Investments held in rabbi trust |  | $ | 115.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 115.3 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 3.6 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | 4.9 |
|  | December 31, 2017
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 1.8 |  |  | $ | 3.9 |  |  | $ | — |  |  | $ | 5.7 |
Petroleum products contracts |  | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
FTRs |  | — |  |  | — |  |  | 4.4 |  |  | 4.4 |
Coal contracts |  | — |  |  | 1.1 |  |  | — |  |  | 1.1 |
Total derivative assets |  | $ | 3.0 |  |  | $ | 5.0 |  |  | $ | 4.4 |  |  | $ | 12.4 |
Investments held in rabbi trust |  | $ | 120.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 120.7 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 7.0 |  |  | $ | 3.8 |  |  | $ | — |  |  | $ | 10.8 |
Coal contracts |  | — |  |  | 0.8 |  |  | — |  |  | 0.8 |
Total derivative liabilities |  | $ | 7.0 |  |  | $ | 4.6 |  |  | $ | — |  |  | $ | 11.6 |
The derivative assets and liabilities listed in the tables above include options, swaps, futures, physical commodity contracts, and other instruments used to manage market risks related to changes in commodity prices and interest rates. They also include FTRs, which are used to manage electric transmission congestion costs in the MISO Energy Markets. We hold investments in the Integrys rabbi trust. These investments are restricted as they can only be withdrawn from the trust to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. These investments are included in other long-term assets on our balance sheets. For the three months ended September 30, 2018 and 2017, the net unrealized gains included in earnings related to the investments held at the end of the period were $7.1 million and $4.4 million, respectively. For the nine months ended September 30, 2018 and 2017, the net unrealized gains included in earnings related to the investments held at the end of the period were $7.5 million and $12.2 million, respectively. The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Balance at the beginning of the period |  | $ | 16.7 |  |  | $ | 11.8 |  |  | $ | 4.4 |  |  | $ | 5.1 |
Purchases |  | — |  |  | — |  |  | 18.4 |  |  | 13.8 |
Settlements |  | (5.2 | ) |  | (4.5 | ) |  | (11.3 | ) |  | (11.6 | )
Balance at the end of the period |  | $ | 11.5 |  |  | $ | 7.3 |  |  | $ | 11.5 |  |  | $ | 7.3 |
Fair Value of Financial Instruments The following table shows the financial instruments included on our balance sheets that are not recorded at fair value:
|  | September 30, 2018 |  | December 31, 2017
(in millions) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Preferred stock of subsidiary |  | $ | 30.4 |  |  | $ | 28.3 |  |  | $ | 30.4 |  |  | $ | 30.5 |
Long-term debt, including current portion * |  | 9,464.2 |  |  | 9,762.1 |  |  | 9,561.7 |  |  | 10,341.9 |
* | The carrying amount of long-term debt excludes capital lease obligations of $24.2 million and $27.0 million at September 30, 2018 and December 31, 2017, respectively.
The fair values of our long-term debt and preferred stock are categorized within Level 2 of the fair value hierarchy.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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