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Postretirement Benefits Fair Values of Trust's Pension Assets (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | $ 736.4 | [1] | $ 965.9 | [2]
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.5 | [1] | 6.3 | [2]
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 753.2 | [1] | 964.6 | [2]
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1] | 0.0 | [2]
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.5 | [1] | 6.3 | [2]
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 26.2 | [1] | 145.0 | [2]
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1] | 0.0 | [2]
United States Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[3] | 0.0 | [2],[4]
United States Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 129.1 | [1],[3] | 164.4 | [2],[4]
United States Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[3] | 0.0 | [2],[4]
International Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[3] | 0.0 | [2],[4]
International Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 21.0 | [1],[3] | 28.1 | [2],[4]
International Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[3] | 0.0 | [2],[4]
Government Fixed-Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[5] | 0.0 | [2],[6]
Government Fixed-Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 124.8 | [1],[5] | 119.7 | [2],[6]
Government Fixed-Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[5] | 0.0 | [2],[6]
Corporate Fixed-Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[7] | 0.0 | [2],[8]
Corporate Fixed-Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 415.8 | [1],[7] | 372.3 | [2],[8]
Corporate Fixed-Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[7] | 0.0 | [2],[8]
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[9] | 0.0 | [2],[10]
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 37.3 | [1],[9] | 141.3 | [2],[10]
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[9] | 0.0 | [2],[10],[11]
Other Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 0.0 | [1],[12] | 0.0 | [2],[11]
Other Investment Companies [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | (1.0) | [1],[12] | (6.2) | [2],[11]
Other Investment Companies [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets | [1],[12] | 0.0 |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 753.7 | [1] | 970.9 | [2]
Estimate of Fair Value Measurement [Member] | Short-term Investments [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 26.7 | [1] | 151.3 | [2]
Estimate of Fair Value Measurement [Member] | United States Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 129.1 | [1],[3] | 164.4 | [2],[4]
Estimate of Fair Value Measurement [Member] | International Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 21.0 | [1],[3] | 28.1 | [2],[4]
Estimate of Fair Value Measurement [Member] | Government Fixed-Income Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 124.8 | [1],[5] | 119.7 | [2],[6]
Estimate of Fair Value Measurement [Member] | Corporate Fixed-Income Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 415.8 | [1],[7] | 372.3 | [2],[8]
Estimate of Fair Value Measurement [Member] | Commingled Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | 37.3 | [1],[9] | 141.3 | [2],[10]
Estimate of Fair Value Measurement [Member] | Other Investment Companies [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | (1.0) | [1],[12] | (6.2) | [2],[11]
Estimate of Fair Value Measurement [Member] | Other Pension Plan Liabilities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total pension plan net assets |  | $ (17.3) | [13] | $ (5.0) | [14]
[1] | See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1, Level 2 and Level 3 in 2014.
[2] | See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1, Level 2 and Level 3 in 2013.
[3] | The equity assets are invested in two indexed funds based on the Russell 3000 Index (U.S.) and the MSCI EAFE Equity Index (International). The Trust did not directly own any of the Company's common stock as of December 31, 2014.
[4] | The equity assets are invested in two indexed funds based on the Russell 3000 Index (U.S.) and the MSCI EAFE Equity Index (International). The Trust did not directly own any of the Company's common stock as of December 31, 2013.
[5] | Government securities are comprised of U.S. Treasury bonds and other government securities and are considered Level 2.
[6] | Government securities are comprised primarily of U.S. Treasury bonds and other government securities.
[7] | Corporate securities consist primarily of investment grade bonds issued by companies in diversified industries.
[8] | Corporate securities consist primarily of investment grade bonds issued by companies in diversified industries.
[9] | This class includes commingled funds that primarily invest in investment grade corporate securities and government-related securities. This class also includes investments in non-agency collateralized mortgage obligation and mortgage-backed securities, futures and options.
[10] | This class includes commingled funds that primarily invest in investment grade corporate securities and government-related securities. This class also includes investments in non-agency collateralized mortgage obligation and mortgage-backed securities, futures and options.
[11] | Other investments consist primarily of interest rate swaps used to manage the average duration of the fixed income portfolio.
[12] | Other investments consist primarily of interest rate swaps used to manage the average duration of the fixed income portfolio.
[13] | This class includes interest receivable and receivables/payables for securities sold/purchased.
[14] | This class includes interest receivable and receivables/payables for securities sold/purchased.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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