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Pension Plans (Tables)
9 Months Ended
May 31, 2021
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, 2021May 31, 2020May 31, 2021May 31, 2020
Service cost$1.2 $1.2 $3.7 $3.5 
Interest cost1.6 1.8 4.7 5.5 
Expected return on plan assets(3.4)(3.2)(10.0)(9.4)
Amortization of prior service cost0.8 1.0 2.2 3.0 
Recognized actuarial loss1.4 1.4 4.1 4.2 
Net periodic pension cost$1.6 $2.2 $4.7 $6.8