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Financing Arrangements - Credit Facility (Details)
£ in Millions, $ in Millions
Mar. 27, 2020
USD ($)
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]        
Letters of Credit and bank guarantees outstanding     $ 101.6  
United Kingdom        
Debt Instrument [Line Items]        
Maximum borrowing capacity under credit agreement   £ 20.0 24.8  
Borrowings outstanding     0.0  
Performance guarantee | United Kingdom        
Debt Instrument [Line Items]        
Restricted cash     21.7  
Performance guarantee | Letter of credit agreement        
Debt Instrument [Line Items]        
Letters of credit outstanding     97.1  
Letters of credit primarily for self-insured liabilities        
Debt Instrument [Line Items]        
Letters of Credit and bank guarantees outstanding     4.5  
Fair value of instruments     0.0  
Revolving Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity under credit agreement       $ 800.0
Borrowings outstanding       $ 226.5
Other Credit Facility        
Debt Instrument [Line Items]        
Letters of credit outstanding     $ 7.4  
Credit Facility        
Debt Instrument [Line Items]        
Weighted average interest rate on outstanding borrowings   2.96% 2.96%  
Debt issuance costs incurred $ 2.4      
Unamortized debt issuance costs     $ 5.1  
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     450.0  
Credit Facility | Revolving Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity under credit agreement $ 850.0      
Borrowings outstanding     337.0  
Letters of credit outstanding     94.2  
Available amount under line of credit     $ 418.8