XML 35 R63.htm IDEA: XBRL DOCUMENT v3.19.3
Pension and Defined Contribution Plans - Net Periodic Pension Cost and Pension Plan Asset Allocation (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Domestic Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 4.1 $ 2.9  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 2.9 2.7 $ 3.5
Interest cost 7.7 7.3 6.9
Expected return on plan assets (10.5) (10.2) (9.4)
Amortization of prior service cost 3.5 3.1 3.1
Settlement 0.4 0.0 0.0
Recognized actuarial loss 2.7 4.5 5.3
Net periodic pension cost $ 6.7 $ 7.4 $ 9.4
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.80% 3.90%  
Rate of compensation increase 5.00% 5.50%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.90% 3.50% 3.20%
Expected return on plan assets 7.30% 7.50% 7.50%
Rate of compensation increase 5.50% 5.50% 5.50%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate $ 1.4    
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate $ 1.5    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Pension plan asset allocation, percentage 100.00% 100.00%  
Domestic Plans | Equity securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 55.00%    
Pension plan asset allocation, percentage 53.30% 57.50%  
Domestic Plans | Fixed income securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 40.00%    
Pension plan asset allocation, percentage 41.80% 37.80%  
Domestic Plans | Real estate      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 5.00%    
Pension plan asset allocation, percentage 4.90% 4.70%  
Domestic Plans | Multi-strategy investments      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Pension plan asset allocation, percentage 0.00% 0.00%  
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ 1.4 $ 1.5  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0.2 0.2 $ 0.2
Interest cost 1.3 1.3 1.1
Expected return on plan assets (1.9) (2.2) (1.9)
Amortization of prior service cost 0.0 0.0 0.0
Settlement 0.0 0.0 0.0
Recognized actuarial loss 1.4 2.3 3.6
Net periodic pension cost $ 1.0 $ 1.6 $ 3.0
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 2.00% 2.90%  
Rate of compensation increase 3.10% 3.10%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 2.90% 2.50% 2.10%
Expected return on plan assets 6.50% 6.50% 6.50%
Rate of compensation increase 3.10% 3.10% 3.20%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate $ 1.2    
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate $ 0.3    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Pension plan asset allocation, percentage 100.00% 100.00%  
International Plans | Equity securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 75.00%    
Pension plan asset allocation, percentage 73.00% 61.90%  
International Plans | Fixed income securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 15.00%    
Pension plan asset allocation, percentage 17.10% 25.50%  
International Plans | Real estate      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Pension plan asset allocation, percentage 0.00% 0.00%  
International Plans | Multi-strategy investments      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Targeted asset allocation, percentage 10.00%    
Pension plan asset allocation, percentage 9.90% 12.60%