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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, 2016 | Dec. 31, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Pension Plan, Defined Benefit [Member] |  |  |
US Government Securities | $ 84.7 | $ 61.8 |
Corporate Debt | 217.0 | 206.9 |
Municipal Bonds | 6.2 | 6.8 |
Fair Value of Investments by Hierarchy Level | 313.3 | 275.5 |
Investments measured at NAV | 318.3 | 377.2 |
Accrued Interest Receivable | 3.5 | 3.5 |
Unsettled Transactions Receivable | (1.0) | 0.1 |
Defined Benefit Plan, Fair Value of Plan Assets | 634.1 | 656.3 | $ 772.4
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |
Money Market Funds | 0.2 | 1.0 |
Bond Mutual Funds | 7.5 | 4.0 |
Equity Mutual Funds | 0.0 | 8.8 |
Fair Value of Investments by Hierarchy Level | 7.7 | 13.8 |
Defined Benefit Plan, Fair Value of Plan Assets | 7.7 | 13.8 | $ 26.3
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |
Money Market Funds | 0.2 | 1.0 |
Bond Mutual Funds | 7.5 | 4.0 |
Equity Mutual Funds | 0.0 | 8.8 |
Fair Value of Investments by Hierarchy Level | 7.7 | 13.8 |
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |
US Government Securities | 84.7 | 61.8 |
Corporate Debt | 217.0 | 206.9 |
Mortgage and asset backed securities | 5.4 |  |
Municipal Bonds | 6.2 | 6.8 |
Fair Value of Investments by Hierarchy Level | $ 313.3 | $ 275.5 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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- Definition Bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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