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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, 2019 | Jun. 30, 2018
Pension Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss | $ 445.7 | $ 362.1
Prior service cost (credit) | 14.1 | 16.2
Total | 459.8 | 378.3
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of: |  |
Net actuarial loss (gain) | 94.1 | (75.0)
Amortization of net loss | (10.4) | (13.5)
Amortization of prior service (cost) benefit | (2.1) | (2.1)
Total, before tax effect | 81.6 | (90.6)
Additional information: |  |
Accumulated benefit obligation for all pension plans | 1,331.6 | 1,257.8
Other Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss | 42.3 | 32.9
Prior service cost (credit) | (17.9) | (23.1)
Total | 24.4 | 9.8
Other changes in plan assets and benefit obligations recognized in other comprehensive loss consist of: |  |
Net actuarial loss (gain) | 10.9 | (16.3)
Amortization of net loss | (1.6) | (2.9)
Amortization of prior service (cost) benefit | 5.2 | 5.2
Total, before tax effect | $ 14.5 | $ (14.0)

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