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Debt (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 24, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 02, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes Payable |  | $ 750,400,000 |  | $ 750,400,000 |  |  | $ 752,100,000
Loss on Early Redemption of Debt |  | 0 | $ 0 | (9,100,000) | $ 0 |  |
Interest Expense before Capitalization of Interest |  | 11,400,000 | 12,400,000 | 36,000,000 | 35,400,000 |  |
Capitalization of Interest |  | (100,000) | (300,000) | (600,000) | (800,000) |  |
Interest Expense |  | 11,300,000 | 12,100,000 | 35,400,000 | 34,600,000 |  |
Interest Paid |  | 8,200,000 | 2,900,000 | 30,400,000 | 24,300,000 |  |
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 | 3,900,000 | $ 3,700,000 | 11,600,000 |  |
Interest Paid |  | 0 | 0 | 4,800,000 | 7,500,000 |  |
Senior Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes Payable |  | $ 358,900,000 |  | $ 358,900,000 |  |  | 358,500,000
Notes Payable, Interest Rate, Stated Percentage |  | 6.00% |  | 6.00% |  |  |
Interest Expense before Capitalization of Interest |  | $ 5,600,000 | 5,500,000 | $ 16,700,000 | 16,600,000 |  |
Interest Paid |  | 0 | 0 | 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 |  | $ 247,400,000 |  | $ 247,400,000 |  |  | 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 | $ 6,700,000 | 0 |  |
Interest Paid |  | 5,200,000 | 0 | 5,200,000 | 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 |  | $ 2,800,000 | 2,800,000 | $ 8,300,000 | 6,600,000 |  |
Interest Paid |  | 2,800,000 | 2,700,000 | 8,300,000 | 5,500,000 |  |
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 | 600,000 | 600,000 |  |
Interest Paid |  | 200,000 | 200,000 | 1,300,000 | 500,000 |  |
Revolving Credit Facility [Member] | 2016 Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 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 |  |

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- Definition Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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