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Debt, net - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Sep. 30, 2019
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   31.6    
Line of Credit Facility, Remaining Borrowing Capacity   348.4    
Debt Repurchase Program, Authorized Amount   30.0 $ 30.0  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Deferred finance costs, net   $ 9.4   $ 6.2
3.75% convertible senior notes due 2020, net of discount        
Debt Instrument [Line Items]        
Interest rate percentage   3.75%    
Maturities of Senior Debt $ 118.9      
Senior Notes 8.0%        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount   $ 350.0    
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%