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Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Net Realized Investment Gain (Loss), Excluding Other-Than-Temporary Impairment Loss on Fixed Maturity Securities | $ (1.2) | $ 11.0
Other-Than-Temporary Impairment Loss | (1.0) | 0.0
Net Investment Income | 602.3 | 602.4
Interest and Debt Expense | (40.2) | (39.8)
Other Expenses | (224.2) | (228.8)
Income Before Income Tax | 341.1 | 330.3
Total Income Tax | 67.6 | 100.4
Net Income | 273.5 | 229.9
Reclassification out of Accumulated Other Comprehensive Income or Loss | Net Unrealized Gain on Securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Net Realized Investment Gain (Loss), Excluding Other-Than-Temporary Impairment Loss on Fixed Maturity Securities | 0.2 | 3.4
Other-Than-Temporary Impairment Loss | (1.0) | 0.0
Income Before Income Tax | (0.8) | 3.4
Total Income Tax | (0.2) | 1.1
Net Income | (0.6) | 2.3
Reclassification out of Accumulated Other Comprehensive Income or Loss | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Income Before Income Tax | 14.7 | 12.3
Total Income Tax | 3.0 | 4.3
Net Income | 11.7 | 8.0
Reclassification out of Accumulated Other Comprehensive Income or Loss | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Interest Rate Swaps |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Net Realized Investment Gain (Loss), Excluding Other-Than-Temporary Impairment Loss on Fixed Maturity Securities | (0.1) | 0.0
Net Investment Income | 15.6 | 14.3
Interest and Debt Expense | (0.5) | (0.5)
Reclassification out of Accumulated Other Comprehensive Income or Loss | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Foreign Exchange Contracts |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Net Realized Investment Gain (Loss), Excluding Other-Than-Temporary Impairment Loss on Fixed Maturity Securities | 0.0 | (1.2)
Net Investment Income | (0.3) | (0.3)
Reclassification out of Accumulated Other Comprehensive Income or Loss | Net Actuarial Loss |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Other Expenses | (5.6) | (5.1)
Reclassification out of Accumulated Other Comprehensive Income or Loss | Prior Service Credit |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Other Expenses | 0.1 | 0.2
Reclassification out of Accumulated Other Comprehensive Income or Loss | Unrecognized Pension and Postretirement Benefit Costs |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |
Income Before Income Tax | (5.5) | (4.9)
Total Income Tax | (1.2) | (1.7)
Net Income | $ (4.3) | $ (3.2)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20187-122688 + Details
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