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Financing Arrangements - Credit Facility (Details)
£ in Millions, $ in Millions
Apr. 01, 2020
USD ($)
Mar. 27, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
GBP (£)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]          
Letters of Credit and bank guarantees outstanding     $ 101.4    
United Kingdom          
Debt Instrument [Line Items]          
Maximum borrowing capacity under credit agreement     24.8 £ 20.0  
Borrowings outstanding     0.0    
Performance guarantee | United Kingdom          
Debt Instrument [Line Items]          
Restricted cash     22.3    
Performance guarantee | Letter of credit agreement          
Debt Instrument [Line Items]          
Letters of credit outstanding     96.9    
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]          
Loan amount $ 550.0        
Weighted average interest rate on outstanding borrowings     2.18% 2.18%  
Debt issuance costs incurred   $ 2.5      
Unamortized debt issuance costs     $ 4.9    
Credit Facility | LIBOR          
Debt Instrument [Line Items]          
Variable interest rate (as a percent) 0.74%        
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     447.2    
Credit Facility | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity under credit agreement   $ 850.0      
Borrowings outstanding     277.0    
Letters of credit outstanding     94.0    
Available amount under line of credit     $ 479.0