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Employee Benefit Plans - Information on Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 80.2    
Benefit obligation, end of year   $ 80.2  
Changes in plan assets:      
Fair value of plan assets, beginning of year 188.6    
Fair value of plan assets, end of year 193.8 188.6  
Amounts recognized in statement of financial position      
Deferred charges and other 48.3 67.2  
Other long-term liabilities 131.4 112.0  
Accumulated other comprehensive loss $ (284.7) (273.6)  
Weighted average assumptions      
Defined Benefit Plan, Type us-gaap:PensionPlansDefinedBenefitMember    
U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 80.2 70.5  
Service cost 0.7 0.4 $ 0.4
Interest cost 2.2 2.8 2.7
Actuarial loss (gain) 2.3 10.3  
Settlements and curtailments (4.6) 0.0  
Plan Amendments 0.0 0.0  
Benefits paid (4.8) (3.8)  
Foreign currency exchange rate changes 0.0 0.0  
Benefit obligation, end of year 76.0 80.2 70.5
Changes in plan assets:      
Fair value of plan assets, beginning of year 68.6 69.3  
Actual return on plan assets 5.1 2.7  
Employer contributions 0.3 0.4  
Settlements and curtailments (4.6) 0.0  
Benefits paid (4.8) (3.8)  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets, end of year 64.6 68.6 69.3
Funded Status (11.4) (11.6)  
Amounts recognized in statement of financial position      
Deferred charges and other 0.0 0.0  
Other accrued expenses 0.3 0.3  
Other long-term liabilities 11.1 11.3  
Accumulated other comprehensive loss $ 18.8 $ 19.3  
Weighted average assumptions      
Discount rate 2.46% 3.04%  
Non U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 167.8 $ 148.9  
Service cost 2.2 1.9 2.0
Interest cost 2.3 3.4 3.6
Actuarial loss (gain) (0.9) 27.5  
Settlements and curtailments (1.6) 0.0  
Plan Amendments 0.0 0.2  
Benefits paid (4.1) (5.9)  
Foreign currency exchange rate changes 9.4 (8.2)  
Benefit obligation, end of year 175.1 167.8 148.9
Changes in plan assets:      
Fair value of plan assets, beginning of year 120.0 115.8  
Actual return on plan assets 1.1 13.5  
Employer contributions 5.3 3.1  
Settlements and curtailments 0.0 0.0  
Benefits paid (4.1) (5.9)  
Foreign currency exchange rate changes 6.9 (6.5)  
Fair value of plan assets, end of year 129.2 120.0 $ 115.8
Funded Status (45.9) (47.8)  
Amounts recognized in statement of financial position      
Deferred charges and other 3.0 3.0  
Other accrued expenses 0.4 0.5  
Other long-term liabilities 48.5 50.3  
Accumulated other comprehensive loss $ 51.3 $ 49.9  
Minimum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 0.50% 0.75%  
Rate of compensation increase 2.25% 2.25%  
Maximum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 6.90% 7.70%  
Rate of compensation increase 6.00% 6.00%