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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]            
Loss on debt extinguishment   $ 11,632,000   $ 0 $ 40,130,000 $ 0
Total interest payments         $ 52,700,000 $ 60,000,000
9% Convertible Junior Subordinated Debentures            
Debt Instrument [Line Items]            
Conversion rate (in shares per $1,000 note)         0.0765496  
Principal amount of notes used in determining conversion rate   $ 1,000     $ 1,000  
Convertible debt, conversion price (in dollars per share) | $ / shares   $ 13.06     $ 13.06  
Stated interest rate   9.00%     9.00%  
Extinguishment of debt, amount         $ 88,900,000  
Repurchases of convertible junior subordinated debentures         120,900,000  
Loss on debt extinguishment         $ 32,000,000  
Reduction in potentially dilutive shares due to debt extinguishment | shares         6.8  
Senior Notes | 5.75% Senior Notes Due 2023            
Debt Instrument [Line Items]            
Stated interest rate   5.75%     5.75%  
Redemption of senior notes $ 248,400,000          
Loss on debt extinguishment $ 6,800,000          
Senior Notes | 5.25% Senior Notes Due 2028            
Debt Instrument [Line Items]            
Stated interest rate   5.25%     5.25%  
Federal Home Loan Bank Advances (FHLB)            
Debt Instrument [Line Items]            
Stated interest rate   1.91%     1.91%  
Loss on debt extinguishment     $ 1,300,000      
Federal Home Loan Bank advance prepayment amount     $ 156,300,000