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Retirement Benefits
 6 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost are (in millions):
 
 
Pension Benefits
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
19.5

 
$
22.4

 
$
39.1

 
$
44.6

Interest cost
39.6


39.0


79.2


77.8

Expected return on plan assets
(61.2
)

(61.5
)

(122.4
)

(122.7
)
Amortization:
 
 
 
 
 
 
 
Prior service cost
0.3

 
0.1

 
0.6

 
0.3

Net actuarial loss
19.5


28.4


39.0


56.7

Settlements
(0.2
)
 
—

 
(0.4
)
 
—

Net periodic benefit cost
$
17.5

 
$
28.4

 
$
35.1

 
$
56.7

 

 
Other Postretirement Benefits
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.3

 
$
0.3

 
$
0.5

 
$
0.6

Interest cost
0.5

 
0.6

 
1.1

 
1.2

Amortization:
 
 
 
 
 
 
 
Prior service credit
(1.3
)
 
(1.4
)
 
(2.7
)
 
(2.7
)
Net actuarial loss
0.2

 
0.5

 
0.4

 
0.9

Net periodic benefit credit
$
(0.3
)
 
$
—

 
$
(0.7
)
 
$
—


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.