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Retirement Plans (Tables)
 3 Months Ended
Dec. 31, 2018
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
 
December 31,
 
2018
 
2017
 
(in millions)
Service cost
$
0.4

 
$
0.5

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

 
3.6

Expected return on plan assets
(4.1
)
 
(4.2
)
Amortization of actuarial net loss
0.5

 
0.8

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

Net periodic benefit cost
$
0.3

 
$
0.7