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Retirement Plans (Tables)
 9 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension and Postretirement Benefit (Credit) Cost
The Company's net periodic pension and postretirement benefit (credit) cost for these plans was as follows: 
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
1.5

 
$
1.8

 
$
4.6

 
$
5.5

Interest cost
4.3

 
3.7

 
12.9

 
11.2

Expected return on plan assets
(7.9
)
 
(7.9
)
 
(23.8
)
 
(23.8
)
Recognized net actuarial loss
1.1

 
1.6

 
3.4

 
4.6

Settlement loss recognized
—

 
—

 
—

 
0.3

Net periodic benefit (credit) cost
$
(1.0
)
 
$
(0.8
)
 
$
(2.9
)
 
$
(2.2
)