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Pension Benefit Obligations (Tables)
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2025 and 2024:
Three Months Ended Six Months Ended
March 31, 2025March 31, 2024March 31, 2025March 31, 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 $— $0.1 
Interest cost on projected benefit obligation1.9 9.6 2.5 10.9 3.9 19.5 4.9 21.6 
Expected return on plan assets(1.2)(12.5)(1.4)(14.2)(2.4)(25.3)(2.8)(28.3)
Amortization of net loss (gain)1.0 (0.3)0.7 (0.6)1.9 (0.6)1.5 (1.2)
Net periodic benefit cost (credit)$1.7 $(3.1)$1.8 $(3.9)$3.4 $(6.3)$3.6 $(7.8)