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Debt, net - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Apr. 30, 2020
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 410.0    
Line of Credit Facility, Maximum Borrowing Capacity 600.0    
Letter of Credit, Maximum Borrowing Capacity $ 100.0    
Letter of Credit, Maximum Borrowing Capacity, Percentage of Revolving Credit Commitment 50.00%    
Repayments of Long-term Lines of Credit $ 0.0    
Proceeds from Long-term Lines of Credit 0.0    
Long-term Line of Credit 0.0 $ 0.0  
Letters of credit outstanding 66.3    
Line of Credit Facility, Remaining Borrowing Capacity 343.7    
Debt 704.9 704.5  
Debt Repurchase Program, Authorized Amount 30.0   $ 30.0
Senior Notes [Member]      
Debt Instrument [Line Items]      
Deferred finance costs, net 7.6 8.0  
Senior Notes 3.85%      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400.0    
Interest rate percentage 3.85%    
Debt Instrument, Redemption Price, Percentage 101.925%    
Effective interest rate of liability component 4.10%    
Debt $ 395.7 395.5  
Senior Notes 5.0%      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 300.0    
Interest rate percentage 5.00%    
Debt Instrument, Redemption Price, Percentage 102.50%    
Effective interest rate of liability component 5.20%    
Debt $ 296.7 296.5  
Secured Debt      
Debt Instrument [Line Items]      
Interest rate percentage 4.00%    
Debt $ 12.5 $ 12.5