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FAIR VALUE MEASUREMENTS | 3 Months Ended
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Mar. 31, 2017
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 price 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 derivative 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 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:
|  | March 31, 2017
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 2.3 |  |  | $ | 9.5 |  |  | $ | — |  |  | $ | 11.8 |
FTRs |  | — |  |  | — |  |  | 1.7 |  |  | 1.7 |
Coal contracts |  | — |  |  | 1.0 |  |  | — |  |  | 1.0 |
Total derivative assets |  | $ | 2.3 |  |  | $ | 10.5 |  |  | $ | 1.7 |  |  | $ | 14.5 |
Investments held in rabbi trust |  | $ | 101.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 101.7 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | — |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
Petroleum products contracts |  | 0.3 |  |  | — |  |  | — |  |  | 0.3 |
Coal contracts |  | — |  |  | 3.0 |  |  | — |  |  | 3.0 |
Total derivative liabilities |  | $ | 0.3 |  |  | $ | 3.9 |  |  | $ | — |  |  | $ | 4.2 |
|  | December 31, 2016
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Derivative assets |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 10.1 |  |  | $ | 24.2 |  |  | $ | — |  |  | $ | 34.3 |
Petroleum products contracts |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
FTRs |  | — |  |  | — |  |  | 5.1 |  |  | 5.1 |
Coal contracts |  | — |  |  | 2.0 |  |  | — |  |  | 2.0 |
Total derivative assets |  | $ | 10.3 |  |  | $ | 26.2 |  |  | $ | 5.1 |  |  | $ | 41.6 |
Investments held in rabbi trust |  | $ | 103.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 103.9 |
Derivative liabilities |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | 0.4 |
Petroleum products contracts |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Coal contracts |  | — |  |  | 1.9 |  |  | — |  |  | 1.9 |
Total derivative liabilities |  | $ | 0.3 |  |  | $ | 2.1 |  |  | $ | — |  |  | $ | 2.4 |
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. They also include FTRs, which are used to manage electric transmission congestion costs in the MISO Energy Markets. The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:
|  | Three Months Ended March 31
(in millions) |  | 2017 |  | 2016
Balance at the beginning of the period |  | $ | 5.1 |  |  | $ | 3.6 |
Realized and unrealized losses |  | — |  |  | (0.2 | )
Sales |  | — |  |  | (0.1 | )
Settlements |  | (3.4 | ) |  | (2.2 | )
Balance at the end of the period |  | $ | 1.7 |  |  | $ | 1.1 |
Unrealized gains and losses on Level 3 derivatives are deferred as regulatory assets or liabilities. Therefore, these fair value measurements have no impact on earnings. Realized gains and losses on these instruments flow through cost of sales on the income statements. Fair Value of Financial Instruments The following table shows the financial instruments included on our balance sheets that are not recorded at fair value:
|  | March 31, 2017 |  | December 31, 2016
(in millions) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Preferred stock |  | $ | 30.4 |  |  | $ | 28.9 |  |  | $ | 30.4 |  |  | $ | 28.8 |
Long-term debt, including current portion * |  | 9,272.7 |  |  | 9,730.2 |  |  | 9,285.8 |  |  | 9,818.2 |
* | The carrying amount of long-term debt excludes capital lease obligations of $28.9 million and $29.6 million at March 31, 2017 and
December 31, 2016, respectively. Due to the short-term nature of cash and cash equivalents, net accounts receivable and unbilled revenues, accounts payable, and short-term debt, the carrying amount of each such item approximates fair value. The fair value of our preferred stock is estimated based on the quoted market value for the same issue, or by using a dividend discount model. The fair value of our long-term debt is estimated based upon the quoted market value for the same issue, similar issues, or upon the quoted market prices of United States Treasury issues having a similar term to maturity, adjusted for the issuing company's bond rating and the present value of future cash flows. 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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