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Pension Plans (Tables)
9 Months Ended
May 31, 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 EndedNine Months Ended
 May 31, 2023May 31, 2022May 31, 2023May 31, 2022
Service cost$1.1 $1.3 $3.4 $3.7 
Interest cost2.2 1.5 6.7 4.6 
Expected return on plan assets(2.3)(3.5)(7.1)(10.4)
Amortization of prior service cost0.7 0.7 2.0 2.1 
Recognized actuarial loss0.8 0.8 2.3 2.6 
Net periodic pension cost$2.5 $0.8 $7.3 $2.6