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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Derivative |  |  |  |  |
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position | $ 30.3 |  | $ 30.3 |  | $ 35.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  |  |  | $ 0.6 |
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months |  |  | 44.4 |  |
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness | 10.3 | $ 17.1 | 13.7 | 10.2 |
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge | 0.0 | $ 0.0 | 0.0 | 0.0 |
Derivative, Notional Amount | 1,177.5 |  | 1,177.5 |  | 970.5
Derivative Asset, Fair Value, Gross Asset | 93.5 |  | 93.5 |  | 39.5
Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 898.2 |  | 898.2 |  | 679.8
Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 279.3 |  | 279.3 |  | 290.7
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 360.3 |  | 360.3 |  |
Interest Rate Swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 148.2 |  | 148.2 |  | 148.2
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 181.3 |  | 181.3 |  | 181.3
Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 537.9 |  | 537.9 |  | 498.5
Credit Default Swap | Credit Default Swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 0.0 |  | 0.0 |  | 11.6
Forwards | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 59.5 |  | 59.5 |  | 41.7
Forwards | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 179.0 |  | 179.0 |  |
Notional Amount Of Derivatives Additions | 164.0 |  | 179.0 | 250.0 |
Notional Amount Of Derivatives Terminations |  |  |  | 250.0 |
Derivative, Loss on Derivative |  |  |  | $ 1.2 |
Total Return Swap | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 71.6 |  | 71.6 |  | 89.2
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 0.0 |  | 0.0 |  | 0.0
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 148.2 |  | 148.2 |  | 148.2
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 181.3 |  | 181.3 |  | 181.3
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative |  |  |  |  |
Derivative, Notional Amount | 537.9 |  | 537.9 |  | 498.5
Credit Exposure |  |  |  |  |
Derivative |  |  |  |  |
Credit Exposure on Derivatives | $ 4.6 |  | $ 4.6 |  | $ 1.3

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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- Definition Amount of decrease in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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