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Reclassifications out of Accumulated Other Comprehensive Loss (Tables)
6 Months Ended
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Balances and Reporting Period Activities Related to Reclassifications Out of Accumulated Other Comprehensive Loss
The accumulated balances and reporting period activities for the three and six months ended March 31, 2025 and 2024 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions):
Pension
Related
Adjustments
Foreign
Currency
Translation
Adjustments
Gain/(Loss) on
Derivative
Instruments
Accumulated
Other
Comprehensive
Loss
Balances at December 31, 2024$(237.7)$(752.0)$24.9 $(964.8)
Other comprehensive (loss) income before reclassification(6.4)34.7 (4.9)23.4 
Amounts reclassified from accumulated other comprehensive income (loss)0.5 — (2.2)(1.7)
Balances at March 31, 2025$(243.6)$(717.3)$17.8 $(943.1)
Pension
Related
Adjustments
Foreign
Currency
Translation
Adjustments
Gain/(Loss) on
Derivative
Instruments
Accumulated
Other
Comprehensive
Loss
Balances at December 31, 2023$(235.0)$(679.7)$24.9 $(889.8)
Other comprehensive income (loss) before reclassification1.9 (27.0)8.3 (16.8)
Amounts reclassified from accumulated other comprehensive income (loss)0.1 — (3.5)(3.4)
Balances at March 31, 2024$(233.0)$(706.7)$29.7 $(910.0)
Pension
Related
Adjustments
Foreign
Currency
Translation
Adjustments
Gain/(Loss) on
Derivative
Instruments
Accumulated
Other
Comprehensive
Loss
Balances at September 30, 2024$(252.0)$(646.5)$15.8 $(882.7)
Other comprehensive income (loss) before reclassification7.4 (70.8)7.0 (56.4)
Amounts reclassified from accumulated other comprehensive income (loss)1.0 — (5.0)(4.0)
Balances at March 31, 2025$(243.6)$(717.3)$17.8 $(943.1)
Pension
Related
Adjustments
Foreign
Currency
Translation
Adjustments
Gain/(Loss) on
Derivative
Instruments
Accumulated
Other
Comprehensive
Loss
Balances at September 30, 2023$(226.0)$(739.7)$39.1 $(926.6)
Other comprehensive (loss) income before reclassification(7.2)33.0 (2.3)23.5 
Amounts reclassified from accumulated other comprehensive income (loss)0.2 — (7.1)(6.9)
Balances at March 31, 2024$(233.0)$(706.7)$29.7 $(910.0)