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Other Comprehensive Income (Loss) Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |
AOCI before Tax, Attributable to Parent, beginning balance |  | $ 1,439.5 | $ 1,234.5 | $ 1,574.0
Unrealized Holding Gain (Loss) on Securities Arising During the Period, before tax |  | 636.9 | 320.5 | (198.7)
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, before tax |  | 0.0 | (0.1) | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | (8.0) | 0.0 | (12.9)
Foreign Currently Translation Adjustment, before tax |  | 0.4 | 0.6 | (1.8)
Portion Attributable to Noncontrolling Interest, before tax |  | (3.5) | 5.1 | 1.6
Total other comprehensive income (loss) before reclassifications, before tax |  | 625.8 | 326.1 | (211.8)
Total reclassification adjustment for amounts realized in net income, before tax |  | 87.5 | 121.1 | 127.7
Total other comprehensive income, before tax |  | 538.3 | 205.0 | (339.5)
AOCI before Tax, Attributable to Parent, ending balance | $ 1,234.5 | 1,977.8 | 1,439.5 | 1,234.5
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward] |  |  |  |
AOCI Tax, Attributable to Parent, beginning balance |  | (506.1) | (434.1) | (550.9)
Unrealized Holding Gain (Loss) on Securities Arising During the Period, tax |  | (224.0) | (112.6) | 67.5
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, tax |  | 0.0 | 0.1 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  | 2.8 | 0.0 | 4.5
Foreign currency translation adjustment, tax |  | (0.1) | (0.2) | 0.6
Portion Attributable to Noncontrolling Interest, tax |  | 1.2 | (1.9) | (0.5)
Total Other Comprehensive Income (Loss), before Reclassification Adjustments, Tax |  | (220.1) | (114.6) | 72.1
Total reclassification adjustment for amounts realized in net income, Total tax (provisions) benefit |  | (30.6) | (42.6) | (44.7)
Total other comprehensive income, Total tax (provision) benefit |  | (189.5) | (72.0) | 116.8
AOCI Tax, Attributable to Parent, ending balance | (434.1) | (695.6) | (506.1) | (434.1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income, beginning balance |  | 933.4 | 800.4 | 1,023.1
Unrealized Holding Gain (Loss) on Securities Arising During Period, after tax |  | 412.9 | 207.9 | (131.2)
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, after tax |  | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, after tax |  | (5.2) | 0.0 | (8.4)
Foreign currency translation adjustment, after tax |  | 0.3 | 0.4 | (1.2)
Other comprehensive (income) loss attributable to NCI | 1.1 | (2.3) | 3.2 | 1.1
Total other comprehensive income (loss), before reclassifications, after tax |  | 405.7 | 211.5 | (139.7)
Total reclassification adjustment for amounts realized in net income, Net of tax |  | 56.9 | 78.5 | 83.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 348.8 | 133.0 | (222.7)
After tax total accumulated other comprehensive income, ending balance | 800.4 | 1,282.2 | 933.4 | 800.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax |  | (14.9) | (27.1) | (23.8)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax |  | 5.3 | 9.5 | 8.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | (9.6) | (17.6) | (15.4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 103.3 | 146.3 | 149.7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | (36.2) | (51.4) | (52.5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 67.1 | 94.9 | 97.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax |  | (1.2) | 0.0 | 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax |  | 0.4 | 0.0 | 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | (0.8) | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  | 0.3 | 1.9 | 1.8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  | (0.1) | (0.7) | (0.6)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0.2 | 1.2 | 1.2
Net unrealized gains (losses) on securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income, beginning balance |  | 939.6 | 809.0 | 1,021.9
Unrealized Holding Gain (Loss) on Securities Arising During Period, after tax |  | 412.9 | 207.9 | (131.2)
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, after tax |  | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment, after tax |  | 0.0 | 0.0 | 0.0
Other comprehensive (income) loss attributable to NCI |  | 0.0 | 0.0 | 0.0
Total other comprehensive income (loss), before reclassifications, after tax |  | 412.9 | 207.9 | (131.2)
Total reclassification adjustment for amounts realized in net income, Net of tax |  | 57.5 | 77.3 | 81.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 355.4 | 130.6 | (212.9)
After tax total accumulated other comprehensive income, ending balance | 809.0 | 1,295.0 | 939.6 | 809.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | (9.6) | (17.6) | (15.4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 67.1 | 94.9 | 97.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0.0 | 0.0 | 0.0
Net unrealized gains on forecasted transactions |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income, beginning balance |  | (9.4) | (8.2) | 1.5
Unrealized Holding Gain (Loss) on Securities Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, after tax |  | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, after tax |  | (5.2) | 0.0 | (8.4)
Foreign currency translation adjustment, after tax |  | 0.0 | 0.0 | 0.0
Other comprehensive (income) loss attributable to NCI |  | 0.0 | 0.0 | 0.0
Total other comprehensive income (loss), before reclassifications, after tax |  | (5.2) | 0.0 | (8.4)
Total reclassification adjustment for amounts realized in net income, Net of tax |  | 0.2 | 1.2 | 1.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (5.4) | (1.2) | (9.7)
After tax total accumulated other comprehensive income, ending balance | (8.2) | (14.8) | (9.4) | (8.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0.0 | 0.0 | 0.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0.2 | 1.2 | 1.2
Foreign Currency Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income, beginning balance |  | (1.1) | (1.5) | (0.3)
Unrealized Holding Gain (Loss) on Securities Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, after tax |  | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment, after tax |  | 0.3 | 0.4 | (1.2)
Other comprehensive (income) loss attributable to NCI |  | 0.0 | 0.0 | 0.0
Total other comprehensive income (loss), before reclassifications, after tax |  | 0.3 | 0.4 | (1.2)
Total reclassification adjustment for amounts realized in net income, Net of tax |  | (0.8) | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 1.1 | 0.4 | (1.2)
After tax total accumulated other comprehensive income, ending balance | (1.5) | 0.0 | (1.1) | (1.5)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | (0.8) | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0.0 | 0.0 | 0.0
Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income, beginning balance |  | 4.3 | 1.1 | 0.0
Unrealized Holding Gain (Loss) on Securities Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Net Non-credit Related OTTI Losses, Adjusted for Valuation Changes, after tax |  | 0.0 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives Arising During Period, after tax |  | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment, after tax |  | 0.0 | 0.0 | 0.0
Other comprehensive (income) loss attributable to NCI |  | (2.3) | 3.2 | 1.1
Total other comprehensive income (loss), before reclassifications, after tax |  | (2.3) | 3.2 | 1.1
Total reclassification adjustment for amounts realized in net income, Net of tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | (2.3) | 3.2 | 1.1
After tax total accumulated other comprehensive income, ending balance | $ 1.1 | 2.0 | 4.3 | 1.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | 0.0 | 0.0 | 0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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