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Pension and Defined Contribution Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Amounts recognized in the consolidated balance sheets consist of:      
Non-current assets $ 0.0 $ 1.6  
Non-current liabilities (99.7) (64.6)  
Domestic Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 0.4 0.0 $ 0.0
Change in Benefit Obligation:      
Benefit obligation at beginning of year 203.2 215.5  
Service cost 2.9 2.7 3.5
Interest cost 7.7 7.3 6.9
Amendments 11.4 0.0  
Actuarial losses (gains) 26.2 (14.3)  
Settlement gain (3.4) 0.0  
Benefits paid (8.8) (8.0)  
Other 0.0 0.0  
Benefit obligation at end of year 239.2 203.2 215.5
Change in plan assets:      
Fair value of plan assets at beginning of year 149.4 136.8  
Actual return on plan assets 9.0 11.3  
Employer contributions 5.3 9.3  
Benefits paid (12.2) (8.0)  
Other 0.0 0.0  
Fair value of plan assets at end of year 151.5 149.4 136.8
Funded status at end of year:      
Funded status at the end of year (87.7) (53.8)  
Amounts recognized in the consolidated balance sheets consist of:      
Non-current assets 0.0 1.6  
Current liabilities (1.8) (5.3)  
Non-current liabilities (85.9) (50.1)  
Net amount recognized in consolidated balance sheets (87.7) (53.8)  
Accumulated benefit obligation 239.2 202.7  
Pre-tax amounts in accumulated other comprehensive loss:      
Prior service cost (12.4) (4.6)  
Net actuarial loss (83.4) (58.8)  
Amounts in accumulated other comprehensive loss (95.8) (63.4)  
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year:      
Prior service cost 4.0 3.1  
Net actuarial loss 4.1 2.9  
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 45.5 53.5  
Service cost 0.2 0.2 0.2
Interest cost 1.3 1.3 1.1
Amendments 0.0 0.0  
Actuarial losses (gains) 3.2 (4.5)  
Settlement gain 0.0 0.0  
Benefits paid (2.6) (5.5)  
Other (3.0) 0.5  
Benefit obligation at end of year 44.6 45.5 53.5
Change in plan assets:      
Fair value of plan assets at beginning of year 30.9 34.1  
Actual return on plan assets 3.1 0.9  
Employer contributions 1.2 1.2  
Benefits paid (2.6) (5.5)  
Other (1.9) 0.2  
Fair value of plan assets at end of year 30.7 30.9 $ 34.1
Funded status at end of year:      
Funded status at the end of year (13.9) (14.6)  
Amounts recognized in the consolidated balance sheets consist of:      
Non-current assets 0.0 0.0  
Current liabilities (0.1) (0.1)  
Non-current liabilities (13.8) (14.5)  
Net amount recognized in consolidated balance sheets (13.9) (14.6)  
Accumulated benefit obligation 44.6 45.5  
Pre-tax amounts in accumulated other comprehensive loss:      
Prior service cost 0.0 0.0  
Net actuarial loss (13.0) (12.9)  
Amounts in accumulated other comprehensive loss (13.0) (12.9)  
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 1.4 1.5  
Pensions plans in which benefit obligation exceeds plan assets: | Domestic Plans | Pension Plan      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 119.2    
Benefit obligation at end of year 239.2 119.2  
Change in plan assets:      
Fair value of plan assets at beginning of year 63.8    
Fair value of plan assets at end of year 151.5 63.8  
Amounts recognized in the consolidated balance sheets consist of:      
Accumulated benefit obligation 239.2 118.7  
Pensions plans in which benefit obligation exceeds plan assets: | International Plans | Pension Plan      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 45.5    
Benefit obligation at end of year 44.6 45.5  
Change in plan assets:      
Fair value of plan assets at beginning of year 30.9    
Fair value of plan assets at end of year 30.6 30.9  
Amounts recognized in the consolidated balance sheets consist of:      
Accumulated benefit obligation 44.6 45.5  
Pensions plans in which plan assets exceed benefit obligation: | Domestic Plans | Pension Plan      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 84.0    
Benefit obligation at end of year 0.0 84.0  
Change in plan assets:      
Fair value of plan assets at beginning of year 85.6    
Fair value of plan assets at end of year 0.0 85.6  
Amounts recognized in the consolidated balance sheets consist of:      
Accumulated benefit obligation 0.0 84.0  
Pensions plans in which plan assets exceed benefit obligation: | International Plans | Pension Plan      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 0.0    
Benefit obligation at end of year 0.0 0.0  
Change in plan assets:      
Fair value of plan assets at beginning of year 0.0    
Fair value of plan assets at end of year 0.0 0.0  
Amounts recognized in the consolidated balance sheets consist of:      
Accumulated benefit obligation $ 0.0 $ 0.0