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Retirement Benefits
 9 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost are (in millions):
 
Pension Benefits
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Service cost
$
22.6

 
$
19.6

 
$
68.2

 
$
58.7

Interest cost
34.0


39.6


102.3


118.8

Expected return on plan assets
(60.9
)

(61.2
)

(183.3
)

(183.6
)
Amortization:
 
 
 
 
 
 
 
Prior service cost
0.2

 
0.3

 
0.7

 
0.9

Net actuarial loss
36.7


19.4


110.3


58.4

Settlements
(0.8
)
 
(0.2
)
 
(2.3
)
 
(0.6
)
Net periodic benefit cost
$
31.8

 
$
17.5

 
$
95.9

 
$
52.6

 
 
Other Postretirement Benefits
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Service cost
$
0.3

 
$
0.2

 
$
0.8

 
$
0.7

Interest cost
0.4

 
0.7

 
1.2

 
1.8

Amortization:
 
 
 
 
 
 
 
Prior service credit
(1.4
)
 
(1.4
)
 
(4.1
)
 
(4.1
)
Net actuarial loss
0.4

 
0.2

 
1.1

 
0.6

Net periodic benefit credit
$
(0.3
)
 
$
(0.3
)
 
$
(1.0
)
 
$
(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 income (expense) in the Consolidated Statement of Operations.