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Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Changes in AOCI by Component, Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, beginning of period | $ 1,396.1 | $ 1,330.5
Other comprehensive (loss) income before reclassifications | (1.7) | 31.8
Amounts reclassified from AOCI | 50.8 | (1.3)
Net current-period other comprehensive income (loss) | 49.1 | 30.5
Balances, end of period | 1,628.8 | 1,396.1
Accumulated Other Comprehensive (Loss) Income |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, beginning of period | (143.0) | (173.5)
Balances, end of period | (93.9) | (143.0)
Cash flow hedging items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, beginning of period | (7.0) | 5.5
Other comprehensive (loss) income before reclassifications | (7.3) | (6.7)
Amounts reclassified from AOCI | 8.4 | (5.8)
Net current-period other comprehensive income (loss) | 1.1 | (12.5)
Balances, end of period | (5.9) | (7.0)
Pension and other postretirement benefit plan items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, beginning of period | (95.5) | (132.9)
Other comprehensive (loss) income before reclassifications | 8.8 | 32.9
Amounts reclassified from AOCI | 42.4 | 4.5
Net current-period other comprehensive income (loss) | 51.2 | 37.4
Balances, end of period | (44.3) | (95.5)
Foreign currency items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, beginning of period | (40.5) | (46.1)
Other comprehensive (loss) income before reclassifications | (3.2) | 5.6
Amounts reclassified from AOCI | 0.0 | 0.0
Net current-period other comprehensive income (loss) | (3.2) | 5.6
Balances, end of period | $ (43.7) | $ (40.5)

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