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Schedule 2 - Parent Company Financial Statements - Statements of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 36.9 | $ 47.7 | $ 36.6 | $ (0.3) | $ 31.2 | $ (16.3) | $ 4.0 | $ (2.1) | $ 120.9 | $ 16.8 | $ 85.7
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations: |  |  |  |  |  |  |  |  |  |  |
Net Realized (Gains) Losses on Sales of Investments | (11.5) | (8.1) | (26.4) | (10.5) | (9.1) | (11.6) | (5.6) | (6.8) | (56.5) | (33.1) | (52.1)
Net Impairment Losses Recognized in Earnings | 3.8 | $ 2.9 | $ 2.6 | 5.0 | 8.7 | $ 8.3 | $ 6.4 | 9.3 | 14.3 | 32.7 | 27.2
Loss from Early Extinguishment of Debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 9.1
Other, Net |  |  |  |  |  |  |  |  | (2.1) | 0.7 | 32.2
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 240.6 | 240.5 | 215.0
Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Sales, Paydowns and Maturities of Fixed Maturities |  |  |  |  |  |  |  |  | 528.2 | 532.3 | 627.8
Purchases of Fixed Maturities |  |  |  |  |  |  |  |  | (710.1) | (850.3) | (681.3)
Sales of Equity Securities |  |  |  |  |  |  |  |  | 342.0 | 158.9 | 238.4
Sales of Fair Value Option Investments |  |  |  |  |  |  |  |  | 42.2 | 72.2 | 0.0
Purchases of Fair Value Option Investments |  |  |  |  |  |  |  |  | (7.0) | (21.0) | (111.0)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (57.6)
Change in Short-term Investments |  |  |  |  |  |  |  |  | 39.4 | (18.0) | 104.9
Net Cash Used by Investing Activities |  |  |  |  |  |  |  |  | (105.4) | (238.1) | (28.6)
Notes Payable Proceeds: |  |  |  |  |  |  |  |  |  |  |
Cash Dividends Paid |  |  |  |  |  |  |  |  | (49.5) | (49.2) | (49.7)
Common Stock Repurchases |  |  |  |  |  |  |  |  | 0.0 | (3.8) | (45.0)
Cash Exercise of Stock Options |  |  |  |  |  |  |  |  | 4.0 | 3.5 | 3.9
Net Cash Used by Financing Activities |  |  |  |  |  |  |  |  | (205.2) | (48.4) | (100.8)
Decrease in Cash |  |  |  |  |  |  |  |  | (70.0) | (46.0) | 85.6
Cash, Beginning of Year |  |  |  | 115.7 |  |  |  | 161.7 | 115.7 | 161.7 | 76.1
Cash, End of Year | 45.7 |  |  |  | 115.7 |  |  |  | 45.7 | 115.7 | 161.7
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 120.9 | 16.8 | 85.7
Adjustment Required to Reconcile Net Income to Net Cash Provided by Operations: |  |  |  |  |  |  |  |  |  |  |
Equity in Net Income of Subsidiaries |  |  |  |  |  |  |  |  | (127.6) | (40.4) | (133.2)
Cash Dividends from Subsidiaries |  |  |  |  |  |  |  |  | 108.1 | 77.7 | 285.0
Cash Received for Benefit Plan from Subsidiary |  |  |  |  |  |  |  |  | 0.0 | 1.4 | 0.0
Cash Contribution to Defined Benefit Plan |  |  |  |  |  |  |  |  | 0.0 | (9.0) | 0.0
Net Realized (Gains) Losses on Sales of Investments |  |  |  |  |  |  |  |  | (0.6) | (0.1) | 0.1
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.6
Loss from Early Extinguishment of Debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 9.1
Other, Net |  |  |  |  |  |  |  |  | 0.7 | (9.3) | 41.6
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 101.5 | 37.1 | 289.9
Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Capital Contributed to Subsidiary |  |  |  |  |  |  |  |  | 0.0 | (52.9) | (105.0)
Sales, Paydowns and Maturities of Fixed Maturities |  |  |  |  |  |  |  |  | 45.7 | 73.5 | 11.8
Purchases of Fixed Maturities |  |  |  |  |  |  |  |  | 0.0 | (77.9) | (14.8)
Sales of Equity Securities |  |  |  |  |  |  |  |  | 0.0 | 3.5 | 9.4
Sales of Fair Value Option Investments |  |  |  |  |  |  |  |  | 42.2 | 72.2 | 0.0
Purchases of Fair Value Option Investments |  |  |  |  |  |  |  |  | (7.0) | (21.0) | (111.0)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (71.0)
Change in Short-term Investments |  |  |  |  |  |  |  |  | 15.6 | 14.8 | 90.3
Net Cash Used by Investing Activities |  |  |  |  |  |  |  |  | 96.5 | 12.2 | (190.3)
Notes Payable Proceeds: |  |  |  |  |  |  |  |  |  |  |
Net Proceeds from Issuance of Subordinated Debentures |  |  |  |  |  |  |  |  | 200.2 | 0.0 | 247.3
Repayments of Debt |  |  |  |  |  |  |  |  | (360.0) | 0.0 | (258.8)
Cash Dividends Paid |  |  |  |  |  |  |  |  | (49.5) | (49.2) | (49.7)
Common Stock Repurchases |  |  |  |  |  |  |  |  | 0.0 | (3.8) | (45.0)
Cash Exercise of Stock Options |  |  |  |  |  |  |  |  | 4.0 | 3.5 | 3.9
Excess Tax Benefits on Share Based Awards |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.7
Net Cash Used by Financing Activities |  |  |  |  |  |  |  |  | (205.3) | (49.5) | (101.6)
Decrease in Cash |  |  |  |  |  |  |  |  | (7.3) | (0.2) | (2.0)
Cash, Beginning of Year |  |  |  | $ 15.7 |  |  |  | $ 15.9 | 15.7 | 15.9 | 17.9
Cash, End of Year | $ 8.4 |  |  |  | $ 15.7 |  |  |  | $ 8.4 | $ 15.7 | $ 15.9

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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