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Debt - Debt Outstanding (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 12, 2017 | Feb. 24, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 02, 2018 | Jun. 30, 2018 | Jun. 29, 2018 | Jun. 08, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 215,000,000 | $ 360,000,000 | $ 0 |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2018 - $911.2; 2017 - $614.6) |  |  | 909,000,000 | 592,300,000 |  |  |  |  |
Senior Notes [Member] | Term Loan Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 250,000,000.0 |
Long-term Debt, Gross |  |  | 34,900,000 | 0 |  |  |  |  |
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 200,000,000 | $ 250,000,000.0 |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 448,400,000 | 448,100,000 |  |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2018 - $911.2; 2017 - $614.6) |  |  | 450,000,000 |  |  |  |  |  |
Issuance costs | $ 200,200,000 | $ 247,300,000 |  |  |  |  |  |  |
Senior Notes [Member] | Senior Note Due on September Nineteen,Twenty Twenty Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 281,500,000 | 0 |  |  |  |  |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | 144,200,000 | 144,200,000 |  |  |  |  |
Federal Home Loan Bank of Chicago [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  |  | 10,000,000 | 0 |  |  | $ 55,000,000 |  |
Federal Home Loan Bank of Dallas [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  |  | $ 0 | $ 0 |  |  | $ 55,000,000 |  |
Revolving Credit Facility [Member] | Credit facility and Secured Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Borrowing Capacity, Available |  |  |  |  |  |  |  |  | $ 100,000,000
Infinity [Member] | Senior Notes [Member] | Senior Note Due on September Nineteen,Twenty Twenty Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 275,000,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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