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Retirement Benefits
 6 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [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,
 
2013
 
2012
 
2013
 
2012
Service cost
$
23.0

 
$
18.1

 
$
46.1

 
$
36.0

Interest cost
40.0

 
42.0

 
80.2

 
83.9

Expected return on plan assets
(56.4
)
 
(57.2
)
 
(113.2
)
 
(114.2
)
Amortization:
 
 
 
 
 
 
 
Prior service credit
(0.7
)
 
(0.6
)
 
(1.3
)
 
(1.2
)
Net actuarial loss
36.1

 
23.7

 
72.4

 
47.4

Net periodic benefit cost
$
42.0

 
$
26.0

 
$
84.2

 
$
51.9

 
 
Other  Postretirement
Benefits
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2013
 
2012
 
2013
 
2012
Service cost
$
0.6

 
$
0.6

 
$
1.2

 
$
1.1

Interest cost
1.5

 
1.8

 
3.1

 
3.6

Amortization:
 
 
 
 
 
 
 
Prior service credit
(2.7
)
 
(2.7
)
 
(5.4
)
 
(5.3
)
Net actuarial loss
1.1

 
0.6

 
2.2

 
1.2

Net periodic benefit cost
$
0.5

 
$
0.3

 
$
1.1

 
$
0.6


In October 2011, we made a voluntary contribution of $300 million to our U.S. qualified pension plan trust.