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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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Bond Mutual Funds

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Equity Mutual Funds

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Mortgage and asset backed securities

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

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