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Debt, net - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Apr. 30, 2020
Debt Instrument [Line Items]      
Repayments of Long-term Lines of Credit $ 0.0    
Line of Credit Facility, Current Borrowing Capacity 380.0    
Line of Credit Facility, Maximum Borrowing Capacity 570.0    
Letter of Credit, Maximum Borrowing Capacity $ 100.0    
Letter of Credit, Maximum Borrowing Capacity, Percentage of Revolving Credit Commitment 50.00%    
Proceeds from Long-term Lines of Credit $ 0.0    
Long-term Line of Credit 0.0 $ 0.0  
Letters of credit outstanding 40.5    
Line of Credit Facility, Remaining Borrowing Capacity 339.5    
Debt Repurchase Program, Authorized Amount 30.0   $ 30.0
Senior Notes [Member]      
Debt Instrument [Line Items]      
Deferred finance costs, net $ 8.4 $ 8.9  
Senior Notes 8.0%      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Price, Percentage 104.00%    
Debt Instrument, Face Amount $ 350.0    
Effective interest rate of liability component 8.50%    
Interest rate percentage 8.00%    
Senior Notes 5.0%      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Price, Percentage 102.50%    
Debt Instrument, Face Amount $ 300.0    
Effective interest rate of liability component 5.20%    
Interest rate percentage 5.00%    
Secured Debt      
Debt Instrument [Line Items]      
Interest rate percentage 4.00%