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Discontinued Operations (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 18, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Payments to Acquire Other Investments |  | $ 22.4 |  |  |  | $ 10.9 |  |
Investments |  | 5,339.0 | $ 5,334.8 |  |  |  | $ 5,334.8 |
Net realized and unrealized investment gains |  | 51.3 |  |  |  | 29.5 |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (1.0) |  |  |  | 0.0 |  |
Net (loss) income from discontinued operations |  | 0.0 |  |  |  | 1.1 |  |
Net change in foreign currency translation |  | 0.9 |  |  |  | 0.1 |  |
Other liabilities |  | 178.5 | 199.9 |  |  |  | 199.9 |
Income Tax Expense (Benefit) |  | 3.9 |  |  |  | (9.7) |  |
Net Realized and Unrealized Gain (Loss) on Trading Securities |  | 51.3 |  |  |  | 29.5 |  |
Sirius Group |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Sales of unconsolidated affiliates and consolidated subsidiaries, net of cash sold | $ 2,600.0 |  |  |  | $ 2,600.0 |  |  |
Payments to Acquire Other Investments | $ 161.8 |  |  |  | $ 161.8 |  |  |
Investments |  |  |  |  |  |  |  | $ 686.2
Net realized and unrealized investment gains |  |  |  |  |  | 4.1 |  |
Net (loss) gain on sale of discontinued operations, net of tax |  |  |  | $ 4.0 |  |  | 363.2 |
Net change in foreign currency translation |  | 0.0 |  |  |  | 37.2 |  |
Sale of Sirius Group [Member] |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Change in foreign currency translation and other, net of tax |  |  |  |  |  |  | 113.3 |
Tranzact [Member] |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Sales of unconsolidated affiliates and consolidated subsidiaries, net of cash sold |  |  | $ 1.2 | 221.3 |  |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (1.0) |  | 51.9 |  |  | 51.9 |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  | $ 30.2 |  |  | 30.2 |
Discontinued Operations [Member] |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Net realized and unrealized investment gains |  | 0.0 |  |  |  | (8.8) |  |
Net (loss) income from discontinued operations |  | 0.0 |  |  |  | 1.1 |  |
Net change in foreign currency translation |  | 0.0 |  |  |  | 37.2 |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | 0.0 |  |  |  | (0.1) |  |
Discontinued Operations [Member] | Sirius Group |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Net realized and unrealized investment gains |  | 0.0 |  |  |  | (8.8) |  |
Net (loss) income from discontinued operations |  | 0.0 |  |  |  | (0.9) |  |
Net change in foreign currency translation |  | 0.0 |  |  |  | 37.2 |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | $ 0.0 |  |  |  | 0.9 |  |
Discontinued Operations [Member] | Tranzact [Member] |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Net (loss) income from discontinued operations |  |  |  |  |  | $ (2.0) |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  | (21.4) |
Tax Effect of Extraordinary Item, Gain (Loss) |  |  |  |  |  |  | 30.2 |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  | (8.8) |
Discontinued Operations, Held-for-sale | Star & Shield LLC [Member] |  |  |  |  |  |  |  |
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |
Other Expenses |  |  |  |  |  |  | $ 21.0 |

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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 + Details
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