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Pension and Postretirement Health and Life Benefits Pension and Postretirement Health and Life Benefits (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Pension Plan, Defined Benefit [Member] |  |  |  |
US Government Securities | $ 61.8 | $ 81.5 |  |
Corporate Debt | 206.9 | 249.6 |  |
Municipal Bonds | 6.8 | 8.1 |  |
Fair Value of Investments by Hierarchy Level | 275.5 | 339.2 |  |
Investments measured at NAV | 377.2 | 429.1 |  |
Accrued Interest Receivable | 3.5 | 4.0 |  |
Unsettled Transactions Receivable | 0.1 | 0.1 |  |
Defined Benefit Plan, Fair Value of Plan Assets | 656.3 | 772.4 | $ 781.5 | $ 784.0
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |
Money Market Funds | 1.0 | 0.8 |  |
Bond Mutual Funds | 4.0 | 8.5 |  |
Equity Mutual Funds | 8.8 | 17.0 |  |
Fair Value of Investments by Hierarchy Level | 13.8 | 26.3 |  |
Defined Benefit Plan, Fair Value of Plan Assets | 13.8 | 26.3 | $ 28.7 | $ 36.9
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |
Money Market Funds | 1.0 | 0.8 |  |
Bond Mutual Funds | 4.0 | 8.5 |  |
Equity Mutual Funds | 8.8 | 17.0 |  |
Fair Value of Investments by Hierarchy Level | 13.8 | 26.3 |  |
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |
US Government Securities | 61.8 | 81.5 |  |
Corporate Debt | 206.9 | 249.6 |  |
Municipal Bonds | 6.8 | 8.1 |  |
Fair Value of Investments by Hierarchy Level | $ 275.5 | $ 339.2 |  |

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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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