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Pension Plans (Tables)
3 Months Ended
Nov. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost Net periodic pension cost included the following components before tax for the periods presented (in millions):
 Three Months Ended
 November 30, 2020November 30, 2019
Service cost$1.2 $1.2 
Interest cost1.6 1.8 
Expected return on plan assets(3.3)(3.1)
Amortization of prior service cost0.7 1.0 
Recognized actuarial loss1.4 1.4 
Net periodic pension cost$1.6 $2.3