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Pension Benefit Obligations (Tables)
9 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Cost for Pension Plans The following table details the components of net periodic benefit cost for the Company’s pension plans for the three and nine months ended June 30, 2025 and 2024:
Three Months Ended Nine Months Ended
June 30, 2025June 30, 2024June 30, 2025June 30, 2024
U.S.Int’l U.S. Int’l U.S. Int’l U.S. Int’l
(in millions)
Components of net periodic benefit cost:
Service costs$— $— $— $0.1 $— $0.1 $— $0.2 
Interest cost on projected benefit obligation2.0 10.2 2.4 10.8 5.9 29.7 7.3 32.4 
Expected return on plan assets(1.2)(13.3)(1.3)(14.3)(3.6)(38.6)(4.1)(42.6)
Amortization of prior service cost— 0.1 — 0.1 — 0.1 — 0.1 
Amortization of net loss (gain)0.9 (0.4)0.8 (0.6)2.8 (1.0)2.3 (1.8)
Net periodic benefit cost (credit)$1.7 $(3.4)$1.9 $(3.9)$5.1 $(9.7)$5.5 $(11.7)