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Reclassifications from Accumulated Other Comprehensive (Loss) Income - Schedule of Changes in AOCI by Component, Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | $ 1,485.9 | $ 1,198.6 | $ 1,104.9
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | (1.0) | 0.0 | 0.0
Balances, end of period | 1,520.1 | 1,485.9 | 1,198.6
Cash flow hedging items |  |  |
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | 23.8 | (2.3) | (21.8)
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | (1.0) |  |
Other comprehensive (loss) income before reclassifications | (32.7) | 26.9 | 5.8
Amounts reclassified from AOCI | (4.9) | (0.8) | 13.7
Net current-period other comprehensive (loss) income | (38.6) | 26.1 |
Balances, end of period | (14.8) | 23.8 | (2.3)
Pension and other postretirement benefit plan items |  |  |
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | (220.4) | (299.0) |
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | 0.0 |  |
Other comprehensive (loss) income before reclassifications | (79.7) | 69.7 |
Amounts reclassified from AOCI | 6.8 | 8.9 |
Net current-period other comprehensive (loss) income | (72.9) | 78.6 |
Balances, end of period | (293.3) | (220.4) | (299.0)
Unrealized losses on available-for-sale securities |  |  |
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | (0.3) | (0.3) |
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | 0.0 |  |
Other comprehensive (loss) income before reclassifications | 0.3 | 0.0 |
Amounts reclassified from AOCI | 0.0 | 0.0 |
Net current-period other comprehensive (loss) income | 0.3 | 0.0 |
Balances, end of period | 0.0 | (0.3) | (0.3)
Foreign currency items |  |  |
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | (42.9) | (41.5) |
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | 0.0 |  |
Other comprehensive (loss) income before reclassifications | (0.8) | (1.4) |
Amounts reclassified from AOCI | 0.0 | 0.0 |
Net current-period other comprehensive (loss) income | (0.8) | (1.4) |
Balances, end of period | (43.7) | (42.9) | (41.5)
Total |  |  |
Changes in the balance of Accumulated Other Comprehensive Income |  |  |
Balances, beginning of period | (239.8) | (343.1) |
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | (1.0) |  |
Other comprehensive (loss) income before reclassifications | (112.9) | 95.2 |
Amounts reclassified from AOCI | 1.9 | 8.1 |
Net current-period other comprehensive (loss) income | (112.0) | 103.3 |
Balances, end of period | $ (351.8) | $ (239.8) | $ (343.1)

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