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Retirement Benefits
 6 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic pension and postretirement benefit cost were (in millions):
 Pension Benefits
 Three Months Ended
March 31,
Six Months Ended
March 31,
 2024202320242023
Service cost$9.2 $10.6 $18.5 $21.2 
Interest cost36.7 39.5 73.3 78.7 
Expected return on plan assets(42.5)(51.7)(84.7)(103.0)
Amortization of net actuarial gain(0.2)(1.0)(0.5)(2.0)
Settlement charge — 117.9 — 117.9 
Net periodic pension benefit cost$3.2 $115.3 $6.6 $112.8 
 Other Postretirement Benefits
 Three Months Ended
March 31,
Six Months Ended
March 31,
 2024202320242023
Service cost$0.2 $0.1 $0.3 $0.2 
Interest cost0.7 0.5 1.3 1.1 
Amortization of net actuarial loss0.4 0.2 0.8 0.3 
Net periodic postretirement benefit cost$1.3 $0.8 $2.4 $1.6 
The service cost component is included in Cost of sales and Selling, general and administrative expenses in the Consolidated Statement of Operations. All other components are included in Other income (expense) in the Consolidated Statement of Operations.