Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

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Financing Agreements - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
Mar. 31, 2023
USD ($)
Mar. 31, 2022
Sep. 30, 2022
USD ($)
Jun. 16, 2020
USD ($)
Debt Instrument [Line Items]            
Long-term debt $ 1,313,900,000   $ 1,313,900,000   $ 1,222,100,000  
Covenant terms, maximum ratio of indebtedness to earnings before interest, taxes, depreciation, and amortization         3.50  
Covenant terms, minimum ratio of earnings before interest, taxes, depreciation, and amortization to interest expense         3.00  
$1,000.0 revolving credit facility (excluding outstanding letters of credit)            
Debt Instrument [Line Items]            
Long-term debt 0   0   $ 6,700,000  
Letters of credit outstanding, amount 18,300,000   18,300,000      
Line of credit facility, remaining borrowing capacity $ 981,700,000   $ 981,700,000      
Weighted average facility fee 0.20% 0.15% 0.16% 0.15%    
Weighted-average interest rates 3.12%   3.12%      
$200.0 term loan            
Debt Instrument [Line Items]            
Long-term debt $ 197,500,000   $ 197,500,000   0  
Weighted-average interest rates 5.99%   5.99%      
Long-Term Debt, Draw on Loan Executed, Amount $ 200,000,000.0   $ 200,000,000.0      
$100.0 Series A Notes (4)            
Debt Instrument [Line Items]            
Long-term debt 0   0   99,900,000  
Other Financing Agreements            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 435,300,000   435,300,000   373.6  
Line of credit facility, amount utilized for bank guarantees 311,000,000.0   311,000,000.0   247.4  
$400.0 senior unsecured notes (1)            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 400,000,000.0
Long-term debt 397,500,000   397,500,000   397,100,000  
$375.0 senior unsecured notes, net of discount (2)            
Debt Instrument [Line Items]            
Long-term debt 372,500,000   372,500,000   $ 372,200,000  
L/G Facility Agreement Amendment            
Debt Instrument [Line Items]            
Covenant terms, maximum ratio of indebtedness to earnings before interest, taxes, depreciation, and amortization         4.00  
2019 Notes | $375.0 senior unsecured notes, net of discount (2)            
Debt Instrument [Line Items]            
Debt instrument, face amount 375,000,000.0   375,000,000.0      
2021 Notes | $375.0 senior unsecured notes, net of discount (2)            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 350.0   $ 350.0