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Debt (Tables) | 9 Months Ended
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Sep. 30, 2016
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The amortized cost of debt outstanding at September 30, 2016 and December 31, 2015 was:
(Dollars in Millions) |  | Sep 30, 2016 |  | Dec 31, 2015
Senior Notes: |  |  |  |
6.00% Senior Notes due May 15, 2017 |  | $ | 359.6 |  |  | $ | 359.1 |
4.35% Senior Notes due February 15, 2025 |  | 247.6 |  |  | 247.4 |
7.375% Subordinated Debentures due February 27, 2054 |  | 144.1 |  |  | 144.1 |
Total Debt Outstanding |  | $ | 751.3 |  |  | $ | 750.6 |
Schedule of Interest Expense [Table Text Block] | Interest Expense, including facility fees, accretion of discount and amortization of issuance costs, for the nine and three months ended September 30, 2016 and 2015 was:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2016 |  | Sep 30, 2015 |  | Sep 30, 2016 |  | Sep 30, 2015
Notes Payable under Revolving Credit Agreement |  | $ | 0.6 |  |  | $ | 0.6 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Federal Home Loan Bank of Dallas |  | — |  |  | — |  |  | — |  |  | — |
Federal Home Loan Bank of Chicago |  | — |  |  | — |  |  | — |  |  | — |
Senior Notes Payable: |  |  |  |  |  |  |  |
6.00% Senior Notes due November 30, 2015 |  | — |  |  | 3.7 |  |  | — |  |  | — |
6.00% Senior Notes due May 15, 2017 |  | 16.7 |  |  | 16.7 |  |  | 5.6 |  |  | 5.6 |
4.35% Senior Notes due February 15, 2025 |  | 8.3 |  |  | 6.7 |  |  | 2.7 |  |  | 2.8 |
7.375% Subordinated Debentures due February 27, 2054 |  | 8.3 |  |  | 8.3 |  |  | 2.8 |  |  | 2.8 |
Interest Expense before Capitalization of Interest |  | 33.9 |  |  | 36.0 |  |  | 11.3 |  |  | 11.4 |
Capitalization of Interest |  | (0.5 | ) |  | (0.6 | ) |  | (0.2 | ) |  | (0.1 | )
Total Interest Expense |  | $ | 33.4 |  |  | $ | 35.4 |  |  | $ | 11.1 |  |  | $ | 11.3 |
Schedule of Interest Paid [Table Text Block] | Interest paid, including facility fees, for the nine and three months ended September 30, 2016 and 2015 was:
|  | Nine Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Sep 30, 2016 |  | Sep 30, 2015 |  | Sep 30, 2016 |  | Sep 30, 2015
Notes Payable under Revolving Credit Agreement |  | $ | 0.5 |  |  | $ | 1.3 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Federal Home Loan Bank of Dallas |  | — |  |  | — |  |  | — |  |  | — |
Federal Home Loan Bank of Chicago |  | — |  |  | — |  |  | — |  |  | — |
Senior Notes Payable: |  |  |  |  |  |  |  |
6.00% Senior Notes due November 30, 2015 |  | — |  |  | 4.8 |  |  | — |  |  | — |
6.00% Senior Notes due May 15, 2017 |  | 10.8 |  |  | 10.8 |  |  | — |  |  | — |
4.35% Senior Notes due February 15, 2025 |  | 10.9 |  |  | 5.2 |  |  | 5.5 |  |  | 5.2 |
7.375% Subordinated Debentures due February 27, 2054 |  | 8.3 |  |  | 8.3 |  |  | 2.8 |  |  | 2.8 |
Total Interest Paid |  | $ | 30.5 |  |  | $ | 30.4 |  |  | $ | 8.5 |  |  | $ | 8.2 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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