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Income Taxes - Comprehensive Income Tax Benefit and Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Benefit (Expense) | $ (1.1) | $ 11.8 | $ (8.0) | $ (13.4) | $ (8.3) | $ (20.5) | $ (15.5) | $ 3.1 | $ (10.7) | $ (41.2) | $ 9.2
Unrealized Depreciation (Appreciation) on Securities |  |  |  |  |  |  |  |  | 49.6 | (25.9) | 0.9
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | (0.1) | (0.6) | 0.1
Tax Effects from Postretirement Benefit Plans |  |  |  |  |  |  |  |  | 1.5 | (0.6) | (7.3)
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | (0.3) | 2.4 | (0.6)
Tax Effects from Long-term Equity-based Compensation included in Paid-in Capital |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (1.1)
Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 39.4 | (66.4) | (1.0)
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (0.6) | (0.5) | (2.2)
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | $ (10.7) | $ (41.2) | $ 9.2

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- Definition The tax effect of an increase or decrease in contributed capital (for example, deductible expenditures reported as a reduction of the proceeds from issuing capital stock) during the period charged or credited directly to shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + 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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