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Pension Plans (Tables)
9 Months Ended
May 31, 2022
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 EndedNine Months Ended
 May 31, 2022May 31, 2021May 31, 2022May 31, 2021
Service cost$1.3 $1.2 $3.7 $3.7 
Interest cost1.5 1.6 4.6 4.7 
Expected return on plan assets(3.5)(3.4)(10.4)(10.0)
Amortization of prior service cost0.7 0.8 2.1 2.2 
Recognized actuarial loss0.8 1.4 2.6 4.1 
Net periodic pension cost$0.8 $1.6 $2.6 $4.7