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Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 24, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Notes Payable   $ 750,200,000   $ 750,200,000   $ 752,100,000
Loss on Early Redemption of Debt   0 $ 0 (9,100,000) $ 0  
Interest Expense before Capitalization of Interest   11,200,000 12,400,000 24,600,000 23,000,000  
Capitalization of Interest   (300,000) (200,000) (500,000) (500,000)  
Interest Expense   10,900,000 12,200,000 24,100,000 22,500,000  
Interest Paid   14,400,000 21,200,000 22,200,000 21,400,000  
Senior Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member]            
Debt Instrument [Line Items]            
Notes Payable   $ 0   $ 0   249,500,000
Debt Instrument, Face Amount $ 250,000,000          
Notes Payable, Interest Rate, Stated Percentage   6.00%   6.00%    
Interest Expense before Capitalization of Interest   $ 0 3,800,000 $ 3,700,000 7,700,000  
Interest Paid   0 7,500,000 4,800,000 7,500,000  
Senior Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member]            
Debt Instrument [Line Items]            
Notes Payable   $ 358,800,000   $ 358,800,000   358,500,000
Notes Payable, Interest Rate, Stated Percentage   6.00%   6.00%    
Interest Expense before Capitalization of Interest   $ 5,500,000 5,600,000 $ 11,100,000 11,100,000  
Interest Paid   10,800,000 10,800,000 10,800,000 10,800,000  
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member]            
Debt Instrument [Line Items]            
Notes Payable   $ 247,300,000   $ 247,300,000   0
Debt Instrument, Face Amount $ 250,000,000.0          
Notes Payable, Interest Rate, Stated Percentage 4.35% 4.35%   4.35%    
Proceeds from Debt, Net of Issuance Costs $ 247,300,000          
Debt Instrument, Interest Rate, Effective Percentage 4.49%          
Interest Expense before Capitalization of Interest   $ 2,800,000 0 $ 3,900,000 0  
Interest Paid   0 0 0 0  
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member]            
Debt Instrument [Line Items]            
Notes Payable   $ 144,100,000   $ 144,100,000   144,100,000
Notes Payable, Interest Rate, Stated Percentage   7.375%   7.375%    
Interest Expense before Capitalization of Interest   $ 2,700,000 2,800,000 $ 5,500,000 3,800,000  
Interest Paid   2,700,000 2,800,000 5,500,000 2,800,000  
Notes Payable under Revolving Credit Agreement [Member] | 2016 Credit Agreement [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Amount Outstanding   0   0   0
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Interest Expense before Capitalization of Interest   200,000 200,000 400,000 400,000  
Interest Paid   900,000 100,000 1,100,000 300,000  
Revolving Credit Facility [Member] | 2016 Credit Agreement [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity   225,000,000   225,000,000    
Federal Home Loan Bank of Dallas [Member]            
Debt Instrument [Line Items]            
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   20,500,000   20,500,000    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties       20,500,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   0   0   0
Interest Expense before Capitalization of Interest   0 0 0 0  
Interest Paid   0 0 0 0  
Federal Home Loan Bank of Chicago [Member]            
Debt Instrument [Line Items]            
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   21,000,000   21,000,000    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties       21,000,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   0   0   $ 0
Interest Expense before Capitalization of Interest   0 0 0 0  
Interest Paid   $ 0 $ 0 $ 0 $ 0