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Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Pension Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss | $ 362.1 | $ 451.3
Prior service cost (credit) | 16.2 | 18.3
Total | 378.3 | 469.6
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of: |  |
Net actuarial gain | (75.0) | (59.1)
Amortization of net loss | (13.5) | (37.8)
Prior service cost | 0.0 | 18.6
Amortization of prior service (cost) benefit | (2.1) | (1.8)
Total, before tax effect | (90.6) | (80.1)
Additional information: |  |
Accumulated benefit obligation for all pension plans | 1,257.8 | 1,362.8
Other Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss | 32.9 | 52.2
Prior service cost (credit) | (23.1) | (28.2)
Total | 9.8 | 24.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of: |  |
Net actuarial gain | (16.3) | (5.7)
Amortization of net loss | (2.9) | (3.2)
Prior service cost | 0.0 | 10.7
Amortization of prior service (cost) benefit | 5.2 | 6.5
Total, before tax effect | $ (14.0) | $ 8.3

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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