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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Reclassification from AOCI to Consolidated Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Impairment Losses Recognized in Earnings | $ (1.7) | $ (1.8) | $ (6.7) | $ (3.6) | $ (2.2) | $ (1.8) | $ 0.0 | $ (0.5) | $ (13.8) | $ (4.5) | $ (14.3)
Income Tax Benefit (Expense) | (32.2) | (32.5) | (26.4) | (39.4) | (1.1) | 11.8 | (8.0) | (13.4) | (130.5) | (10.7) | (41.2)
Net Income | $ 124.7 | $ 129.0 | $ 122.1 | $ 155.3 | $ 6.5 | $ 92.2 | $ 37.6 | $ 53.8 | 531.1 | 190.1 | 120.9
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 24.3 | 16.2 | 22.5
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 41.9 | 26.4 | 49.6
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (13.8) | (4.5) | (14.3)
Total Before Income Taxes |  |  |  |  |  |  |  |  | 28.1 | 21.9 | 35.3
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (5.8) | (4.6) | (12.3)
Net Income |  |  |  |  |  |  |  |  | 22.3 | 17.3 | 23.0
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and Other Expenses (Income) |  |  |  |  |  |  |  |  | 3.0 | (1.1) | 0.6
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (0.7) | 0.2 | (0.2)
Net Income |  |  |  |  |  |  |  |  | 2.3 | (0.9) | 0.4
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and Other Expenses (Income) |  |  |  |  |  |  |  |  | (0.4) | (0.3) | (1.3)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.4
Net Income |  |  |  |  |  |  |  |  | $ (0.3) | $ (0.2) | $ (0.9)

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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