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Debt (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Period
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 31, 2019
USD ($)
Debt Instrument [Line Items]        
FHLBC advances $ 155,000,000.0      
FHLBC fixed interest rate 1.91%      
Collateral, principal balance of FHLB (as a percent) 102.00%      
Interest paid $ 50,800,000 $ 51,300,000 $ 57,800,000  
Senior Notes | 5.75% Senior Notes due 2023        
Debt Instrument [Line Items]        
Stated interest rate (in hundredths) 5.75%      
Redemption price, percentage (in hundredths) 100.00%      
Ownership percentage threshold for declaration of due and payable 25.00%      
Convertible Junior Subordinated Debentures, at 9% per annum, Due 2063        
Debt Instrument [Line Items]        
Stated interest rate (in hundredths) 9.00%      
Redemption price, percentage (in hundredths) 100.00%      
Conversion rate (in shares per $1,000 note) | shares 74.4718      
Principal amount of notes used in determining conversion rate $ 1,000      
Initial conversion price (in dollars per share) | $ / shares $ 13.43      
Period preceding election to convert 5 days      
Convertible debt, number of equity instruments reserved for conversion (in shares) | shares 19,100,000      
Closing sale price of our common stock for consideration of redemption (in dollars per share) | $ / shares $ 17.46      
Minimum number of trading days 20 days      
Maximum number of trading days 30 days      
Minimum number of consecutive interest periods for which interest payments may be deferred | Period 1      
Maximum period for which interest payments may be deferred without giving rise to an event of default 10 years      
Period in which reasonable commercial efforts must begin, maximum 1 day      
Anniversary payment release of the start of the interest deferral to the Alternative Payment Mechanism in lieu of the final maturity of the debentures 10 years      
Net proceeds cap (in hundredths) 2.00%      
Maximum number of shares of common stock issuable under the Alternative Payment Mechanism (in shares) | shares 10,000,000      
Maximum percentage of aggregate principal amount of the debentures (in hundredths) 25.00%      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity       $ 175,000,000