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Pension and Defined Contribution Plans (Details)
$ in Millions
 12 Months Ended
Aug. 31, 2020
USD ($)
participant
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Amounts recognized in the consolidated balance sheets consist of:      
Non-current liabilities $ (91.6) $ (99.7)  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to multi-employer plans 0.6 0.5 $ 0.5
Domestic Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost $ 0.0 0.4 0.0
Number of early retirement participants | participant 1    
Change in Benefit Obligation:      
Benefit obligation at beginning of year $ 239.2 203.2  
Service cost 4.3 2.9 2.7
Interest cost 6.4 7.7 7.3
Amendments 0.0 11.4  
Actuarial losses 8.5 26.2  
Settlement gain 0.0 (3.4)  
Benefits paid (8.8) (8.8)  
Other 0.0 0.0  
Benefit obligation at end of year 249.6 239.2 203.2
Change in plan assets:      
Fair value of plan assets at beginning of year 151.5 149.4  
Actual return on plan assets 19.0 9.0  
Employer contributions 5.4 5.3  
Benefits paid (8.8) (12.2)  
Other 0.0 0.0  
Fair value of plan assets at end of year 167.1 151.5 149.4
Funded status at end of year:      
Funded status at the end of year (82.5) (87.7)  
Amounts recognized in the consolidated balance sheets consist of:      
Current liabilities (5.0) (1.8)  
Non-current liabilities (77.5) (85.9)  
Net amount recognized in consolidated balance sheets (82.5) (87.7)  
Accumulated benefit obligation 249.1 239.2  
Pre-tax amounts in accumulated other comprehensive loss:      
Prior service cost (8.4) (12.4)  
Net actuarial loss (79.2) (83.4)  
Amounts in accumulated other comprehensive loss (87.6) (95.8)  
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year:      
Prior service cost 2.9 4.0  
Net actuarial loss 4.1 4.1  
International Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 0.0 0.0 0.0
Change in Benefit Obligation:      
Benefit obligation at beginning of year 44.6 45.5  
Service cost 0.3 0.2 0.2
Interest cost 0.9 1.3 1.3
Amendments 0.0 0.0  
Actuarial losses 0.7 3.2  
Settlement gain 0.0 0.0  
Benefits paid (1.4) (2.6)  
Other 4.1 (3.0)  
Benefit obligation at end of year 49.2 44.6 45.5
Change in plan assets:      
Fair value of plan assets at beginning of year 30.7 30.9  
Actual return on plan assets 1.9 3.1  
Employer contributions 0.8 1.2  
Benefits paid (1.4) (2.6)  
Other 3.1 (1.9)  
Fair value of plan assets at end of year 35.1 30.7 $ 30.9
Funded status at end of year:      
Funded status at the end of year (14.1) (13.9)  
Amounts recognized in the consolidated balance sheets consist of:      
Current liabilities 0.0 (0.1)  
Non-current liabilities (14.1) (13.8)  
Net amount recognized in consolidated balance sheets (14.1) (13.9)  
Accumulated benefit obligation 49.2 44.6  
Pre-tax amounts in accumulated other comprehensive loss:      
Prior service cost 0.0 0.0  
Net actuarial loss (13.5) (13.0)  
Amounts in accumulated other comprehensive loss (13.5) (13.0)  
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year:      
Prior service cost 0.0 0.0  
Net actuarial loss 0.6 1.4  
Pensions plans in which benefit obligation exceeds plan assets: | Domestic Plans | Pension Plan      
Pensions plans in which benefit obligation exceeds plan assets:      
Projected benefit obligation 249.6 239.2  
Accumulated benefit obligation 249.1 239.2  
Plan assets 167.1 151.5  
Pensions plans in which benefit obligation exceeds plan assets: | International Plans | Pension Plan      
Pensions plans in which benefit obligation exceeds plan assets:      
Projected benefit obligation 49.2 44.6  
Accumulated benefit obligation 49.2 44.6  
Plan assets $ 35.1 $ 30.7