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Pension Plans (Tables)
 9 Months Ended
May 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost
Net periodic pension cost for the Company’s defined benefit pension plans during the three and nine months ended May 31, 2018 and 2017 included the following components before tax (in millions):
 
Three Months Ended

Nine Months Ended
 
May 31, 2018

May 31, 2017

May 31, 2018

May 31, 2017
Service cost
$
0.7

 
$
0.9

 
$
2.1

 
$
2.7

Interest cost
2.2

 
2.0

 
6.6

 
6.0

Expected return on plan assets
(3.1
)
 
(2.8
)
 
(9.3
)
 
(8.4
)
Amortization of prior service cost
0.8

 
0.8

 
2.4

 
2.4

Recognized actuarial loss
1.7

 
2.2

 
5.1

 
6.6

Net periodic pension cost
$
2.3

 
$
3.1

 
$
6.9

 
$
9.3