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Retirement Plans (Tables)
9 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic benefit cost for our pension plans are presented below.
 
Three months ended
 
Nine months ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost
$
0.4

 
$
0.5

 
$
1.2

 
$
1.4

Pension costs (benefits) other than service:
 
 
 
 
 
 
 
Interest cost
3.5

 
3.5

 
10.5

 
10.7

Expected return on plan assets
(4.1
)
 
(4.1
)
 
(12.2
)
 
(12.4
)
Amortization of actuarial net loss
0.5

 
0.8

 
1.5

 
2.4

Curtailment/special settlement loss (gain)

 

 
1.0

 

Pension costs (benefits) other than service
(0.1
)
 
0.2

 
0.8

 
0.7

Net periodic benefit cost
$
0.3

 
$
0.7

 
$
2.0

 
$
2.1