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Pension Plans (Tables)
 9 Months Ended
May 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost Net periodic pension cost during the three and nine months ended May 31, 2019 and 2018 included the following components before tax (in millions):
 
Three Months Ended

Nine Months Ended
 
May 31, 2019

May 31, 2018

May 31, 2019

May 31, 2018
Service cost
$
0.8

 
$
0.7

 
$
2.4

 
$
2.1

Interest cost
2.2

 
2.2

 
6.7

 
6.6

Expected return on plan assets
(3.1
)
 
(3.1
)
 
(9.4
)
 
(9.3
)
Amortization of prior service cost
0.8

 
0.8

 
2.3

 
2.4

Settlement loss
—

 
—

 
0.4

 
—

Recognized actuarial loss
1.0

 
1.7

 
3.1

 
5.1

Net periodic pension cost
$
1.7

 
$
2.3

 
$
5.5

 
$
6.9