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Pension Plans (Tables)
6 Months Ended
Feb. 28, 2023
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 EndedSix Months Ended
 February 28, 2023February 28, 2022February 28, 2023February 28, 2022
Service cost$1.2 $1.2 $2.3 $2.4 
Interest cost2.3 1.6 4.5 3.1 
Expected return on plan assets(2.4)(3.5)(4.8)(6.9)
Amortization of prior service cost0.6 0.7 1.3 1.4 
Recognized actuarial loss0.7 0.9 1.5 1.8 
Net periodic pension cost$2.4 $0.9 $4.8 $1.8