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Financing Arrangements - Credit Facility (Details)
£ in Millions, $ in Millions
Apr. 01, 2020
USD ($)
Mar. 27, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
GBP (£)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]            
Letters of Credit and bank guarantees outstanding     $ 101.1      
Self-insurance liabilities     7.4   $ 5.1  
United Kingdom            
Debt Instrument [Line Items]            
Maximum borrowing capacity under credit agreement     20.7 £ 15.0    
Borrowings outstanding under credit agreement     0.0      
Cash on deposit as collateral     28.6      
Performance guarantee | Letter of credit agreement            
Debt Instrument [Line Items]            
Letters of credit outstanding     97.4      
Letters of credit primarily for self-insured liabilities            
Debt Instrument [Line Items]            
Letters of credit outstanding     3.7      
Fair value of instruments     0.0      
Revolving Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity under credit agreement           $ 800.0
Other Credit Facility            
Debt Instrument [Line Items]            
Letters of credit outstanding     $ 6.6      
Credit Facility            
Debt Instrument [Line Items]            
Loan amount $ 500.0          
Weighted average interest rate on outstanding borrowings (as a percent)     1.92% 1.92%    
Debt issuance costs incurred   $ 3.4        
Unamortized debt issuance costs     $ 4.9      
Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Variable interest rate (as a percent) 2.49%          
Credit Facility | LIBOR | Minimum            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)   1.00%        
Credit Facility | LIBOR | Maximum            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)   2.00%        
Credit Facility | Term Loan            
Debt Instrument [Line Items]            
Loan amount   $ 450.0        
Borrowings under term loan     438.8      
Credit Facility | Revolving Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity under credit agreement   $ 850.0        
Borrowings outstanding under credit agreement     279.0      
Letters of credit outstanding     94.5      
Available amount under line of credit     $ 476.5