Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |
12 Months Ended | |||
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Dec. 31, 2021
USD ($)
Subsidiary
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Dec. 31, 2020
USD ($)
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Jan. 01, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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| Significant Of Accounting Policies [Line Items] | ||||
| Life Insurance, Corporate or Bank Owned, Amount | $ 462.5 | $ 465.8 | ||
| Number Of Unconsolidated Subsidiaries | Subsidiary | 8 | |||
| Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 5.2 | 6.8 | $ 2.7 | |
| Loans and Leases Receivable, Allowance | 252.5 | 278.9 | ||
| Deferred tax assets, net | 20.9 | 31.3 | ||
| Off-Balance Sheet, Credit Loss, Liability | 37.6 | 37.0 | $ 9.0 | |
| Retained Earnings (Accumulated Deficit) | $ (2,773.0) | $ (2,001.4) | ||
| Cumulative Effect, Period of Adoption, Adjustment [Member] | ||||
| Significant Of Accounting Policies [Line Items] | ||||
| Off-Balance Sheet, Credit Loss, Liability | $ 15.1 |
| X | ||||||||||
- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of unconsolidated subsidiaries. No definition available.
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- Definition Significant Of Accounting Policies [Line Items] No definition available.
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- Details
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