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Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in the Accumulated other Comprehensive Loss (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 1,264.4 | $ 1,369.0
Fair value of plan assets | 972.4 | 987.4
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 241.5 | 255.1
Fair value of plan assets | $ 117.9 | $ 117.0

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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