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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Realized Gains on Sales of Investments | $ 49.1 | $ 50.9 | $ 78.3 | $ 59.9
Net Impairment Losses Recognized in Earnings | (3.4) | (3.2) | (6.3) | (4.1)
Income from Continuing Operations before Income Taxes | 102.0 | 81.5 | 233.0 | 128.4
Interest and Other Expenses | (25.3) | (22.7) | (74.3) | (65.4)
Income Tax Benefit (Expense) | (33.4) | (25.9) | (73.3) | (34.9)
Total Reclassification from AOCI to Net Income | 70.1 | 55.6 | 162.5 | 101.5
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total Reclassification from AOCI to Net Income | (4.3) | 30.0 | 4.3 | 30.3
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Realized Gains on Sales of Investments | 3.0 | 50.7 | 31.2 | 59.6
Net Impairment Losses Recognized in Earnings | (3.4) | (0.1) | (6.3) | (1.0)
Income from Continuing Operations before Income Taxes | (0.4) | 50.6 | 24.9 | 58.6
Income Tax Benefit (Expense) | 0.1 | (17.8) | (8.7) | (20.6)
Total Reclassification from AOCI to Net Income | (0.3) | 32.8 | 16.2 | 38.0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and Other Expenses | (6.3) | (4.4) | (18.4) | (12.0)
Income Tax Benefit (Expense) | 2.3 | 1.6 | 6.5 | 4.3
Total Reclassification from AOCI to Net Income | $ (4.0) | $ (2.8) | $ (11.9) | $ (7.7)

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: 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.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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