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Retirement Benefits (Tables)
 12 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
The components of net periodic benefit cost (income) were (in millions):
 Pension BenefitsOther Postretirement Benefits
 202320222021202320222021
Service cost$42.0 $70.9 $90.1 $0.6 $0.8 $1.2 
Interest cost149.7 135.6 125.6 2.2 1.3 1.2 
Expected return on plan assets(190.6)(230.7)(241.3)— — — 
Amortization of prior service cost (credit)0.1 0.6 1.4 — (0.8)(5.4)
Amortization of net actuarial (gain) loss(2.6)59.4 141.4 0.5 0.7 1.1 
Settlement and curtailment charges123.4 38.6 39.8 — — — 
Net periodic benefit cost (income)$122.0 $74.4 $157.0 $3.3 $2.0 $(1.9)
Schedule of Assumptions Used
Significant assumptions used in determining net periodic benefit cost (income) were (in weighted averages):
Pension BenefitsOther Postretirement Benefits
 202320222021202320222021
U.S. Plans      
Discount rate5.65 %3.86 %2.90 %5.70 %2.50 %2.15 %
Expected return on plan assets7.00 %7.00 %7.25 %— — — 
Compensation increase rate3.30 %3.40 %3.40 %— — — 
Non-U.S. Plans
Discount rate4.35 %2.01 %1.56 %5.10 %2.90 %2.20 %
Expected return on plan assets4.93 %4.59 %4.68 %— — — 
Compensation increase rate3.03 %3.00 %2.90 %— — — 
Significant assumptions used in determining the benefit obligations were (in weighted averages):
Pension BenefitsOther Postretirement Benefits
 2023202220232022
U.S. Plans    
Discount rate6.10 %5.65 %6.20 %5.70 %
Compensation increase rate3.60 %3.30 %— — 
Health care cost trend rate (1)
— — 6.50 %6.50 %
Non-U.S. Plans 
Discount rate4.65 %4.35 %5.75 %5.10 %
Compensation increase rate3.24 %3.03 %— — 
Health care cost trend rate (1)
— — 4.50 %4.50 %
(1) The health care cost trend rate reflects the estimated increase in gross medical claims costs. As a result of the plan amendment adopted effective October 1, 2002, our effective per person retiree medical cost increase is zero percent beginning in 2005 for the majority of our postretirement benefit plans. For our other plans, we assume the gross health care cost trend rate will remain at 6.50% in 2024 and decrease to 5.00% in 2025 for U.S. Plans and will not change in future periods for Non-U.S. Plans.
Schedule of Net Funded Status
Benefit obligation, plan assets, funded status, and net liability information is summarized as follows (in millions):
 Pension BenefitsOther Postretirement Benefits
 2023202220232022
Benefit obligation at beginning of year$3,165.6 $4,751.8 $44.2 $51.5 
Service cost42.0 70.9 0.6 0.8 
Interest cost149.7 135.6 2.2 1.3 
Actuarial losses (gains)81.1 (1,216.8)8.7 (1.1)
Plan amendments— 4.6 — — 
Plan participant contributions1.8 2.2 4.2 3.8 
Benefits paid(151.1)(153.8)(13.3)(11.7)
Settlements and curtailments(585.6)(320.4)— — 
Currency translation and other47.3 (108.5)(0.2)(0.4)
Benefit obligation at end of year2,750.8 3,165.6 46.4 44.2 
Plan assets at beginning of year2,903.9 4,192.2 — — 
Actual return on plan assets209.7 (768.0)— — 
Company contributions26.6 54.3 9.1 7.9 
Plan participant contributions1.8 2.2 4.2 3.8 
Benefits paid(151.1)(153.8)(13.3)(11.7)
Settlements and curtailments(585.6)(312.2)— — 
Currency translation and other52.1 (110.8)— — 
Plan assets at end of year2,457.4 2,903.9 — — 
Funded status of plans$(293.4)$(261.7)$(46.4)$(44.2)
Schedule of Amounts Recognized in Balance Sheet
Net amount on balance sheet consists of
Other assets$150.4 $158.8 $— $— 
Compensation and benefits(16.8)(15.1)(7.1)(6.4)
Retirement benefits(427.0)(405.4)(39.3)(37.8)
Net amount on balance sheet$(293.4)$(261.7)$(46.4)$(44.2)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
Amounts included in Accumulated other comprehensive loss, net of tax, which have not yet been recognized in net periodic benefit cost (income) are as follows (in millions):
 Pension BenefitsOther Postretirement Benefits
 2023202220232022
Prior service (credit) cost$(153.2)$(61.3)$4.7 $4.7 
Net actuarial loss548.9 503.9 6.7 0.5 
Total$395.7 $442.6 $11.4 $5.2 
Schedule of Accumulated and Projected Benefit Obligations
Information regarding our pension plans with projected benefit obligations in excess of the fair value of plan assets (underfunded plans) are as follows (in millions):
20232022
Projected benefit obligation$2,082.7 $2,529.0 
Fair value of plan assets1,638.9 2,108.5 
Information regarding our pension plans with accumulated benefit obligations in excess of the fair value of plan assets (underfunded plans) are as follows (in millions):
20232022
Accumulated benefit obligation$1,926.2 $2,365.5 
Fair value of plan assets1,626.7 2,108.5 
Schedule of Expected Benefit Payments
The following benefit payments, which include employees’ expected future service, as applicable, are expected to be paid (in millions):
Pension BenefitsOther
Postretirement Benefits
2024$302.8 $7.3 
2025210.5 6.8 
2026213.4 6.2 
2027226.6 5.6 
2028222.4 5.0 
2029-20331,124.7 15.5 
Schedule of Weighted Average Allocation of Plan Assets Our global weighted average targeted and actual asset allocations at September 30, by asset category, are:
 TargetSeptember 30,
Asset CategoryAllocations20232022
Equity securities38%50%53%
Debt securities52%43%41%
Other10%7%6%
Schedule of Allocation of Plan Assets
The following table presents our pension plans’ investments measured at fair value as of September 30, 2023 (in millions):
Level 1Level 2Level 3Total
U.S. Plans
Cash and cash equivalents$3.2 $— $— $3.2 
Equity securities
Mutual funds40.5 — — 40.5 
Preferred and common stock381.8 — — 381.8 
Common collective trusts— 447.4 — 447.4 
Fixed income securities
Preferred and corporate debt— 387.2 — 387.2 
Government securities212.3 30.2 — 242.5 
Common collective trusts— 104.5 — 104.5 
Total U.S. Plans investments in fair value hierarchy$637.8 $969.3 $— 1,607.1 
U.S. Plans investments measured at NAV
Private equity and alternative equity11.7 
Total U.S. Plans investments1,618.8 
Non-U.S. Plans
Cash and cash equivalents$7.0 $— $— 7.0 
Equity securities
Preferred and common stock154.7 — — 154.7 
Common collective trusts— 209.7 — 209.7 
Fixed income securities
Preferred and corporate debt— 30.3 — 30.3 
Government securities0.8 — — 0.8 
Common collective trusts— 294.5 — 294.5 
Other types of investments
Real estate funds— 55.3 — 55.3 
Insurance contracts— — 65.2 65.2 
Other— — 2.4 2.4 
Total Non-U.S. Plans investments in fair value hierarchy$162.5 $589.8 $67.6 819.9 
Non-U.S. Plans investments measured at NAV
Real estate funds18.7 
Total Non-U.S. Plans investments838.6 
Total investments measured at fair value$2,457.4 
The following table presents our pension plans’ investments measured at fair value as of September 30, 2022 (in millions):
Level 1Level 2Level 3Total
U.S. Plans
Cash and cash equivalents$3.1 $— $— $3.1 
Equity securities
Mutual funds53.1 — — 53.1 
Preferred and common stock532.9 — — 532.9 
Common collective trusts— 621.1 — 621.1 
Fixed income securities
Preferred and corporate debt— 453.1 — 453.1 
Government securities224.8 41.6 — 266.4 
Common collective trusts— 143.6 — 143.6 
Total U.S. Plans investments in fair value hierarchy$813.9 $1,259.4 $— 2,073.3 
U.S. Plans investments measured at NAV
Private equity and alternative equity18.0 
Total U.S. Plans investments2,091.3 
Non-U.S. Plans
Cash and cash equivalents$13.3 $— $— 13.3 
Equity securities
Preferred and common stock143.2 — — 143.2 
Common collective trusts— 185.1 — 185.1 
Fixed income securities
Preferred and corporate debt— 39.7 — 39.7 
Government securities1.3 — — 1.3 
Common collective trusts— 291.3 — 291.3 
Other types of investments
Real estate funds— 63.7 — 63.7 
Insurance contracts— — 54.9 54.9 
Other— — 3.8 3.8 
Total Non-U.S. Plans investments in fair value hierarchy$157.8 $579.8 $58.7 796.3 
Non-U.S. Plans investments measured at NAV
Real estate funds16.3 
Total Non-U.S. Plans investments812.6 
Total investments measured at fair value$2,903.9 
Defined Benefit Plan Change in Fair Value of Plan Assets Level Three
The table below sets forth a summary of changes in fair market value of our pension plans’ Level 3 assets for the year ended September 30, 2023 (in millions):
 Balance September 30, 2022Realized Gains (Losses)Unrealized Gains (Losses)Purchases, Sales, Issuances, and Settlements, NetBalance September 30, 2023
Non-U.S. Plans
Insurance contracts$54.9 $— $9.6 $0.7 $65.2 
Other3.8 — — (1.4)2.4 
 $58.7 $— $9.6 $(0.7)$67.6 
The table below sets forth a summary of changes in fair market value of our pension plans’ Level 3 assets for the year ended September 30, 2022 (in millions):
Balance
October 1, 2021		Realized Gains (Losses)Unrealized Gains (Losses)Purchases, Sales, Issuances, and Settlements, NetBalance September 30, 2022
U.S. Plans
Insurance contracts$0.9 $— $— $(0.9)$— 
Non-U.S. Plans
Insurance contracts106.2 — (50.9)(0.4)54.9 
Other4.7 — (0.7)(0.2)3.8 
 $111.8 $— $(51.6)$(1.5)$58.7