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Debt (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Dec. 31, 2016
USD ($)
Period
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Period
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Feb. 26, 2016
USD ($)
Nov. 02, 2015
Debt Instrument [Line Items]                              
Deferred issuance costs     $ 10,800,000       $ 11,200,000       $ 10,800,000 $ 11,200,000      
Repayments of Convertible Debt                     $ 363,778,000 11,152,000 $ 0    
FHLBC advances                           $ 155,000,000  
FHLBC fixed interest rate   1.91%                          
Collateral, principal balance of FHLB (as a percent)   102.00%                 102.00%        
Long-term debt, gross     1,189,500,000       1,223,000,000       $ 1,189,500,000 1,223,000,000      
Repayment of long-term debt                     0 61,953,000 20,772,000    
Loss on debt extinguishment     $ 0 $ 75,223,000 $ 1,868,000 $ 13,440,000 507,000 $ 0 $ 0 $ 0 $ 90,531,000 507,000 $ 837,000    
Senior Notes | 5.75% Senior Notes due 2023                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths) 5.75%   5.75%               5.75%        
Outstanding principal amount $ 425,000,000                            
Proceeds from issuance of debt $ 418,100,000                            
Redemption price, percentage (in hundredths)                     100.00%        
Other expenses associated with the issuance of notes     $ 1,200,000               $ 1,200,000        
Ownership percentage threshold for declaration of due and payable                     25.00%        
Long-term debt, gross     $ 425,000,000       0       $ 425,000,000 0      
Senior Notes | 5.75% Senior Notes due 2023 | U.S. Treasury Rate                              
Debt Instrument [Line Items]                              
Basis spread on redemption premium (as a percent) 0.50%                            
Senior Notes | 5.375% Senior Notes                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)                             5.375%
Convertible Debt                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)     5.00%               5.00%        
Repayments of Convertible Debt                     $ 195,500,000 12,000,000      
Long-term debt, gross     $ 145,000,000       333,500,000       145,000,000 333,500,000      
Extinguishment of debt, amount                     $ 188,500,000 $ 11,500,000      
Reduction in shares for computation of earnings per share | shares                     14,000,000 900,000      
Conversion rate (in shares per $1,000 note) | shares                     74.4186        
Principal amount of notes used in determining conversion rate     $ 1,000               $ 1,000        
Initial conversion price (in dollars per share) | $ / shares     $ 13.44               $ 13.44        
Convertible debt, number of equity instruments reserved for conversion | shares     10,800,000               10,800,000        
Minimum percentage of consolidated shareholders' equity that determines designated subsidiary status     15.00%               15.00%        
Convertible Debt | 2% Convertible Senior Notes                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)     2.00%               2.00%        
Repayments of Convertible Debt       230,700,000                      
Extinguishment of debt, amount       $ 292,400,000                      
Reduction in shares for computation of earnings per share | shares       42,100,000                      
Repayments of long-term debt       $ 362,100,000                      
Repayments of debt (in shares) | shares       18,300,000                      
2% Convertible Senior Notes due 2020                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)     2.00%               2.00%        
Redemption price, percentage (in hundredths)                     100.00%        
Long-term debt, gross     $ 207,600,000       500,000,000       $ 207,600,000 $ 500,000,000      
Conversion rate (in shares per $1,000 note) | shares                     143.8332        
Principal amount of notes used in determining conversion rate     $ 1,000               $ 1,000        
Initial conversion price (in dollars per share) | $ / shares     $ 6.95               $ 6.95        
Convertible debt, number of equity instruments reserved for conversion | shares     29,900,000               29,900,000        
Minimum number of trading days                     20 days        
Maximum number of trading days                     30 days        
Percentage of conversion price (in hundredths)     130.00%               130.00%        
130% of conversion price (in dollars per share) | $ / shares     $ 9.04               $ 9.04        
Convertible Junior Subordinated Debentures Due 2063                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)     9.00%               9.00%        
Redemption price, percentage (in hundredths)                     100.00%        
Long-term debt, gross     $ 256,900,000       389,500,000       $ 256,900,000 389,500,000      
Conversion rate (in shares per $1,000 note) | shares                     74.0741        
Principal amount of notes used in determining conversion rate     $ 1,000               $ 1,000        
Initial conversion price (in dollars per share) | $ / shares     $ 13.50               $ 13.50        
Convertible debt, number of equity instruments reserved for conversion | shares     19,000,000               19,000,000        
Minimum number of trading days                     20 days        
Maximum number of trading days                     30 days        
Percentage of conversion price (in hundredths)     130.00%               130.00%        
130% of conversion price (in dollars per share) | $ / shares     $ 17.55               $ 17.55        
Period preceding election to convert                     5 days        
Minimum number of consecutive interest periods for which interest payments may be deferred | Period     1               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%               2.00%        
Maximum number of shares of common stock issuable under the Alternative Payment Mechanism (in shares) | shares     10,000,000               10,000,000        
Maximum percentage of aggregate principal amount of the debentures (in hundredths)     25.00%               25.00%        
Convertible Junior Debentures at 9% per annum, Due 2063                              
Debt Instrument [Line Items]                              
Stated interest rate (in hundredths)     9.00%               9.00%        
Extinguishment of debt, amount   $ 132,700,000                          
Repayment of long-term debt   $ 150,700,000                          
Reduction in shares for computation of earnings per share | shares                     9,800,000        
Loss on debt extinguishment                     $ 8,300,000        
Reacquisition of convertible junior subordinated debentures-equity component                     $ 6,300,000        
Accounting Standards Update 2015-03 | Long-term Debt                              
Debt Instrument [Line Items]                              
Deferred issuance costs             (11,200,000)         (11,200,000)      
Accounting Standards Update 2015-03 | Other Assets                              
Debt Instrument [Line Items]                              
Deferred issuance costs             $ (11,200,000)         $ (11,200,000)