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Retirement Benefits
 6 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost were (in millions):
 Pension Benefits
 Three Months Ended
March 31,		Six Months Ended
March 31,
 2022202120222021
Service cost$20.3 $22.9 $40.7 $45.6 
Interest cost32.4 31.5 64.8 62.8 
Expected return on plan assets(59.3)(60.7)(118.7)(121.1)
Amortization:
Prior service cost0.8 0.3 0.8 0.7 
Net actuarial loss22.3 36.8 44.6 73.5 
Settlements24.9 (0.2)24.9 (0.4)
Net periodic benefit cost$41.4 $30.6 $57.1 $61.1 
 Other Postretirement Benefits
 Three Months Ended
March 31,		Six Months Ended
March 31,
 2022202120222021
Service cost$0.2 $0.2 $0.4 $0.5 
Interest cost0.3 0.3 0.6 0.6 
Amortization:
Prior service credit(0.2)(1.3)(0.4)(2.7)
Net actuarial loss0.1 0.3 0.3 0.6 
Net periodic benefit cost (credit)$0.4 $(0.5)$0.9 $(1.0)
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 (expense) income in the Consolidated Statement of Operations.
In March 2022, we remeasured our U.S. pension plan assets and liabilities in accordance with U.S. GAAP settlement accounting rules and recognized settlement expense of $24.9 million. Settlement accounting was required due to the amount of lump-sum payments made by the U.S. pension plan to retirees and other separated employees. Remeasurement of our U.S. pension plan assets and liabilities reduced our net benefit obligation by $199.2 million. The discount rate used for the remeasurement as of March 31, 2022, was 4.00 percent compared to 3.10 percent at our September 30, 2021, annual measurement date.