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Retirement Benefits (Tables)
 12 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
The components of net periodic benefit cost (income) are (in millions):
 Pension BenefitsOther Postretirement Benefits
 202120202019202120202019
Service cost$90.1 $91.1 $78.2 $1.2 $1.0 $0.9 
Interest cost125.6 136.4 158.3 1.2 1.6 2.3 
Expected return on plan assets(241.3)(244.8)(244.7)— — — 
Amortization:
Prior service cost (credit)1.4 0.9 1.2 (5.4)(5.4)(5.4)
Net actuarial loss141.4 147.3 77.8 1.1 1.4 0.9 
Settlements39.8 — 1.2 — — — 
Net periodic benefit cost (income)$157.0 $130.9 $72.0 $(1.9)$(1.4)$(1.3)
Schedule of Assumptions Used
Significant assumptions used in determining net periodic benefit cost (income) are (in weighted averages):
Pension BenefitsOther Postretirement Benefits
 202120202019202120202019
U.S. Plans      
Discount rate2.90 %3.30 %4.35 %2.15 %2.90 %4.15 %
Expected return on plan assets7.25 %7.50 %7.50 %— — — 
Compensation increase rate3.40 %3.40 %3.50 %— — — 
Non-U.S. Plans
Discount rate1.56 %1.60 %2.48 %2.20 %2.65 %3.30 %
Expected return on plan assets4.68 %5.11 %5.22 %— — — 
Compensation increase rate2.90 %3.06 %3.02 %— — — 
Significant assumptions used in determining the benefit obligations are (in weighted averages):
Pension BenefitsOther Postretirement Benefits
 2021202020212020
U.S. Plans    
Discount rate3.10 %2.90 %2.50 %2.15 %
Compensation increase rate3.40 %3.40 %— — 
Health care cost trend rate(1)
— — 6.00 %6.25 %
Non-U.S. Plans 
Discount rate2.03 %1.56 %2.90 %2.20 %
Compensation increase rate3.00 %2.90 %— — 
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 6.00% in 2022 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
 2021202020212020
Benefit obligation at beginning of year$5,026.9 $4,907.3 $57.0 $60.7 
Service cost90.1 91.1 1.2 1.0 
Interest cost125.6 136.4 1.2 1.6 
Actuarial (gains) losses(162.6)154.1 (4.9)(1.4)
Acquisitions— (0.6)— — 
Plan amendments0.1 — — — 
Plan participant contributions2.8 3.1 3.1 3.0 
Benefits paid(156.9)(285.0)(8.8)(7.8)
Settlements(219.3)(10.5)— — 
Currency translation and other45.1 31.0 2.7 (0.1)
Benefit obligation at end of year4,751.8 5,026.9 51.5 57.0 
Plan assets at beginning of year3,838.0 3,753.1 — — 
Actual return on plan assets653.7 266.0 — — 
Company contributions34.9 84.1 5.7 4.8 
Plan participant contributions2.8 3.1 3.1 3.0 
Benefits paid(156.9)(285.0)(8.8)(7.8)
Settlements(219.3)(10.5)— — 
Currency translation and other39.0 27.2 — — 
Plan assets at end of year4,192.2 3,838.0 — — 
Funded status of plans$(559.6)$(1,188.9)$(51.5)$(57.0)
Schedule of Amounts Recognized in Balance Sheet
Net amount on balance sheet consists of:
Other assets$118.5 $27.9 $— $— 
Compensation and benefits(37.0)(13.9)(5.7)(5.8)
Retirement benefits(641.1)(1,202.9)(45.8)(51.2)
Net amount on balance sheet$(559.6)$(1,188.9)$(51.5)$(57.0)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
Amounts included in accumulated other comprehensive loss, net of tax, which have not yet been recognized in net periodic benefit cost are as follows (in millions):
 Pension BenefitsOther Postretirement Benefits
 2021202020212020
Prior service (credit) cost$(30.7)$3.3 $4.1 $— 
Net actuarial loss718.7 1,262.1 2.0 5.8 
Total$688.0 $1,265.4 $6.1 $5.8 
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):
20212020
Projected benefit obligation$4,210.5 $4,482.0 
Fair value of plan assets3,532.4 3,265.2 
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):
20212020
Accumulated benefit obligation$3,510.7 $4,113.4 
Fair value of plan assets3,156.7 3,265.2 
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
2022$327.5 $5.8 
2023284.4 5.5 
2024289.0 5.1 
2025288.8 4.8 
2026289.9 4.5 
2027-20311,420.8 17.4 
Schedule of Weighted Average Allocation of Plan Assets Our global weighted-average targeted and actual asset allocations at September 30, by asset category, are:
 AllocationTargetSeptember 30,
Asset CategoryRangeAllocations20212020
Equity securities40% –65%50%56%50%
Debt securities30% –50%43%38%43%
Other0% –15%7%6%7%
Schedule of Allocation of Plan Assets
The following table presents our pension plans’ investments measured at fair value as of September 30, 2021:
Level 1Level 2Level 3Total
U.S. Plans
   Cash and cash equivalents$3.5 $— $— $3.5 
   Equity securities:
      Mutual funds88.7 — — 88.7 
      Common stock1,159.8 — — 1,159.8 
      Common collective trusts— 609.2 — 609.2 
   Fixed income securities:
      Corporate debt— 678.2 — 678.2 
      Government securities290.5 66.5 — 357.0 
      Common collective trusts— 119.7 — 119.7 
   Other types of investments:
      Insurance contracts— — 0.9 0.9 
Total U.S. Plans investments in fair value hierarchy$1,542.5 $1,473.6 $0.9 3,017.0 
U.S. Plans investments measured at NAV:
      Private equity30.3 
      Alternative equity— 
Total U.S. Plans investments3,047.3 
Non-U.S. Plans
   Cash and cash equivalents$8.5 $— $— 8.5 
   Equity securities:
      Common stock170.3 — — 170.3 
      Common collective trusts— 334.9 — 334.9 
   Fixed income securities:
      Corporate debt— 64.7 — 64.7 
      Government securities1.4 — — 1.4 
      Common collective trusts— 357.0 — 357 
   Other types of investments:
      Real estate funds— 81.1 — 81.1 
      Insurance contracts— — 106.2 106.2 
      Other— — 4.7 4.7 
Total Non-U.S. Plans investments in fair value hierarchy$180.2 $837.7 $110.9 1,128.8 
Non-U.S. Plans investments measured at NAV:
      Real estate funds16.1 
Total Non-U.S. Plans investments1,144.9 
Total investments measured at fair value$4,192.2 
The following table presents our pension plans’ investments measured at fair value as of September 30, 2020:
Level 1Level 2Level 3Total
U.S. Plans
   Cash and cash equivalents$1.4 $— $— $1.4 
   Equity securities:
      Mutual funds112.4 — — 112.4 
      Common stock947.7 — — 947.7 
      Common collective trusts— 467.4 — 467.4 
   Fixed income securities:
      Corporate debt— 699.3 — 699.3 
      Government securities244.7 133.1 — 377.8 
      Common collective trusts— 169.0 — 169.0 
   Other types of investments:
      Insurance contracts— — 0.9 0.9 
Total U.S. Plans investments in fair value hierarchy$1,306.2 $1,468.8 $0.9 2,775.9 
U.S. Plans investments measured at NAV:
      Private equity23.5 
      Alternative equity18.4 
Total U.S. Plans investments2,817.8 
Non-U.S. Plans
   Cash and cash equivalents$1.9 $— $— 1.9 
   Equity securities:
      Common stock62.4 — — 62.4 
      Common collective trusts— 329.3 — 329.3 
   Fixed income securities:
      Corporate debt— 65.6 — 65.6 
      Government securities1.1 — — 1.1 
      Common collective trusts— 350.9 — 350.9 
   Other types of investments:
      Real estate funds— 78.9 — 78.9 
      Insurance contracts— — 110.2 110.2 
      Other— — 4.6 4.6 
Total Non-U.S. Plans investments in fair value hierarchy$65.4 $824.7 $114.8 1,004.9 
Non-U.S. Plans investments measured at NAV:
      Real estate funds15.3 
Total Non-U.S. Plans investments1,020.2 
Total investments measured at fair value$3,838.0 
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, 2021:
 Balance
October 1, 2020		Realized Gains (Losses)Unrealized Gains (Losses)Purchases, Sales, Issuances, and Settlements, NetBalance September 30, 2021
U.S. Plans
   Insurance contracts$0.9 $— $— $— $0.9 
Non-U.S. Plans
   Insurance contracts110.2 — (5.7)1.7 106.2 
   Other4.6 — 0.1 — 4.7 
 $115.7 $— $(5.6)$1.7 $111.8 
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, 2020:
Balance
October 1, 2019		Realized Gains (Losses)Unrealized Gains (Losses)Purchases, Sales, Issuances, and Settlements, NetBalance September 30, 2020
U.S. Plans
   Insurance contracts$0.9 $— $— $— $0.9 
Non-U.S. Plans
   Insurance contracts95.4 — 13.0 1.8 110.2 
   Other4.5 — 0.1 — 4.6 
 $100.8 $— $13.1 $1.8 $115.7