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Pension Plans (Tables)
6 Months Ended
Feb. 28, 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 EndedSix Months Ended
 February 28, 2022February 28, 2021February 28, 2022February 28, 2021
Service cost$1.2 $1.3 $2.4 $2.5 
Interest cost1.6 1.5 3.1 3.1 
Expected return on plan assets(3.5)(3.3)(6.9)(6.6)
Amortization of prior service cost0.7 0.7 1.4 1.4 
Recognized actuarial loss0.9 1.3 1.8 2.7 
Net periodic pension cost$0.9 $1.5 $1.8 $3.1