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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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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
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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.

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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

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Debt (bills, notes or bonds) that are issued by the government of the United States 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6507016

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