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Retirement and Postretirement Plans (Tables)
 9 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Net Pension Expense
The following table details the components of net pension expense for our defined benefit retirement plans.
 
Quarter Ended June 30
 
Year to Date Ended June 30
 
2017
 
2016
 
2017
 
2016
Service cost
$
1.4

 
$
1.3

 
$
4.3

 
$
3.8

Interest cost
2.5

 
2.8

 
7.4

 
8.2

Expected return on plan assets
(3.7
)
 
(3.3
)
 
(11.0
)
 
(9.8
)
Amortization of unrecognized prior service cost, net
—

 
0.1

 
0.1

 
0.2

Amortization of net loss
1.5

 
1.1

 
4.6

 
3.4

Net pension expense
$
1.7

 
$
2.0

 
$
5.4

 
$
5.8