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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 97.5 | $ 122.3 | $ 126.1 | $ 64.0 | $ 124.7 | $ 129.0 | $ 122.1 | $ 155.3 | $ 409.9 | $ 531.1 | $ 190.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Decrease (Increase) in Value of Equity and Convertible Securities at Fair Value | (73.1) | (45.2) | (71.6) | 117.8 | (39.2) | (9.8) | (25.5) | (64.4) | (72.1) | (138.9) | 64.3
Net Realized Investment (Gains) Losses | 0.1 | $ (10.0) | $ (11.7) | (16.5) | (2.8) | (1.7) | $ (21.3) | (16.1) | (38.1) | (41.9) | (26.4)
Loss from Early Extinguishment of Debt |  |  |  |  |  | $ 5.8 |  |  | 0.0 | 5.8 | 0.0
Other Assets and Liabilities |  |  |  |  |  |  |  |  | (27.8) | 5.4 | 94.9
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 448.0 | 534.3 | 539.2
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sales, Calls and Maturities of Fixed Maturities |  |  |  |  |  |  |  |  | 972.4 | 1,229.1 | 2,643.3
Fixed Maturities |  |  |  |  |  |  |  |  | (1,293.3) | (1,284.9) | (2,413.2)
Equity Securities |  |  |  |  |  |  |  |  | (319.1) | (307.0) | (478.5)
Equity Securities |  |  |  |  |  |  |  |  | 434.4 | 217.3 | 351.9
Net Sales (Purchases) of Short-term Investments |  |  |  |  |  |  |  |  | (390.8) | (176.0) | 52.7
Acquisition of Business |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (560.6)
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (757.0) | (633.4) | (497.6)
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Net Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | 395.6 | 49.9 | 249.4
Dividends and Dividend Equivalents Paid |  |  |  |  |  |  |  |  | (78.9) | (67.8) | (56.4)
Proceeds from Shares Issued under Employee Stock Purchase Plan |  |  |  |  |  |  |  |  | 4.4 | 1.6 | 0.0
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  | 5.0 | 2.4 | 0.9
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | 378.3 | 160.8 | (12.2)
Cash, Beginning Balance |  |  |  | 136.8 |  |  |  |  | 136.8 |  |
Cash, Ending Balance | 206.1 |  |  |  | 136.8 |  |  |  | 206.1 | 136.8 |
Common Stock Repurchases |  |  |  |  |  |  |  |  | 110.4 | 0.0 | 0.0
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 409.9 | 531.1 | 190.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Equity in Net Income of Subsidiaries |  |  |  |  |  |  |  |  | (475.4) | (556.0) | (238.6)
Cash Dividends from Subsidiaries |  |  |  |  |  |  |  |  | 216.2 | 239.0 | 130.4
Contribution to Defined Benefit Pension Plan |  |  |  |  |  |  |  |  | 0.0 | (55.3) | (5.0)
Decrease (Increase) in Value of Equity and Convertible Securities at Fair Value |  |  |  |  |  |  |  |  | (4.3) | (1.6) | (1.4)
Net Realized Investment (Gains) Losses |  |  |  |  |  |  |  |  | (0.1) | (0.3) | 0.7
Loss from Early Extinguishment of Debt |  |  |  |  |  |  |  |  | 0.0 | 5.8 | 0.0
Other Assets and Liabilities |  |  |  |  |  |  |  |  | 52.2 | 9.8 | 29.6
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 262.6 | 172.5 | 105.8
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Capital Contributed to Subsidiaries |  |  |  |  |  |  |  |  | (62.0) | (83.0) | (20.0)
Capital Distributed from Subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 85.0 | 176.0
Proceeds from Sales, Calls and Maturities of Fixed Maturities |  |  |  |  |  |  |  |  | 2.0 | 12.7 | (0.2)
Equity Securities |  |  |  |  |  |  |  |  | (21.0) | (48.9) | (2.3)
Equity Securities |  |  |  |  |  |  |  |  | 2.2 | 15.3 | 67.5
Net Sales (Purchases) of Short-term Investments |  |  |  |  |  |  |  |  | (415.7) | (23.3) | 253.4
Acquisition of Business |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (564.6)
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (494.5) | (42.2) | (90.2)
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Net Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | 395.6 | 49.9 | 249.4
Repayment of Long-term Debt |  |  |  |  |  |  |  |  | 0.0 | (185.0) | (215.0)
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  | 0.0 | 127.5 | 0.0
Dividends and Dividend Equivalents Paid |  |  |  |  |  |  |  |  | (78.9) | (67.8) | (56.4)
Proceeds from Shares Issued under Employee Stock Purchase Plan |  |  |  |  |  |  |  |  | 4.4 | 1.6 | 0.0
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  | 5.4 | 2.4 | 0.9
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | 216.1 | (71.4) | (21.1)
Cash, Period Increase (Decrease), Total |  |  |  |  |  |  |  |  | (15.8) | 58.9 | (5.5)
Cash, Beginning Balance |  |  |  | $ 61.8 |  |  |  | $ 2.9 | 61.8 | 2.9 | 8.4
Cash, Ending Balance | $ 46.0 |  |  |  | $ 61.8 |  |  |  | 46.0 | $ 61.8 | $ 2.9
Common Stock Repurchases |  |  |  |  |  |  |  |  | (110.4) |  |
Settlement Benefits |  |  |  |  |  |  |  |  | $ 64.1 |  |

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- Definition The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + Details
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- Definition The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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