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Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The components of net periodic benefit cost for our defined benefit pension plans for the three months ended 31 December 2018 and 2017 were as follows:
 
Pension Benefits
 
2018
 
2017
Three Months Ended 31 December
U.S.
 
International
 
U.S.
 
International
Service cost

$5.4

 

$4.9

 

$6.4

 

$6.3

Interest cost
28.4

 
9.0

 
26.7

 
9.2

Expected return on plan assets
(43.1
)
 
(18.9
)
 
(50.4
)
 
(20.2
)
Prior service cost amortization
.3

 
—

 
.4

 
—

Actuarial loss amortization
16.1

 
2.8

 
21.7

 
10.0

Settlements
.8

 
.2

 
1.8

 
—

Special termination benefits
.7

 
—

 
—

 
—

Other
—

 
.3

 
—

 
.5

Net Periodic (Benefit) Cost

$8.6

 

($1.7
)
 

$6.6

 

$5.8