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Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5.9 $ 5.4 $ 17.5 $ 16.1
Interest cost 22.9 28.2 68.5 85.0
Expected return on plan assets (47.2) (43.2) (141.6) (129.4)
Prior service cost amortization 0.3 0.3 0.9 0.9
Actuarial loss amortization 20.9 16.3 62.9 48.9
Settlements 0.3 0.3 1.8 6.1
Special termination benefits 0.0 0.0 0.0 0.7
Other 0.0 0.0 0.0 0.0
Net periodic benefit cost 3.1 7.3 10.0 28.3
International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5.7 4.8 17.4 14.6
Interest cost 6.0 9.0 18.4 27.0
Expected return on plan assets (18.8) (18.9) (57.7) (57.0)
Prior service cost amortization 0.0 0.0 0.0 0.1
Actuarial loss amortization 4.7 2.7 14.5 8.3
Settlements 0.0 0.0 0.0 0.2
Special termination benefits 0.0 0.0 0.0 0.0
Other 0.2 0.2 0.6 0.6
Net periodic benefit cost $ (2.2) $ (2.2) $ (6.8) $ (6.2)