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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2016
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Contributions by Employer | $ 1.3 |  |
Defined Benefit Plan, Expected Return on Plan Assets | 10.5 | $ 12.2 |
Pension Plan, Defined Benefit [Member] | Scenario, Forecast [Member] |  |  |
Defined Benefit Plan, Contributions by Employer |  |  | $ 2.9
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Expected Return on Plan Assets | $ 0.1 | $ 0.2 |
Other Postretirement Benefit Plan, Defined Benefit [Member] | Scenario, Forecast [Member] |  |  |
Defined Benefit Plan, Contributions by Employer |  |  | $ 5.4

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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