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Accumulated other-than-temporary impairment gain (loss) on investments in securities, for which a portion of the other-than-temporary impairment has been recognized in earnings, and a portion recorded in other comprehensive income, net of tax, at the end of an accounting period.

No definition available.

Name:	pl_AccumulatedOtherComprehensiveIncomeLossUnrealizedOtherThanTemporaryImpairmentGainLoss
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Represents the liability as of the balance sheet date of amounts held for annuity contracts.

No definition available.

Name:	pl_AnnuityAccountBalances
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No definition available.

Name:	pl_AssetsRelatedToSeparateAccountsAbstract
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Assets Related To Separate Accounts, Reinsurance Assumed

No definition available.

Name:	pl_AssetsRelatedToSeparateAccountsReinsuranceAssumed
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Total fair value as of the balance sheet date of the portion of variable annuity funds maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria.

No definition available.

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Total fair value as of the balance sheet date of the portion of variable universal life funds maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria.

No definition available.

Name:	pl_AssetsRelatedToSeparateAccountsVariableUniversalLife
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No definition available.

Name:	pl_LiabilitiesRelatedToSeparateAccountsAbstract
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Liabilities Related To Separate Accounts, Reinsurance Assumed

No definition available.

Name:	pl_LiabilitiesRelatedToSeparateAccountsReinsuranceAssumed
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Data Type:	xbrli:monetaryItemType
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The liability related to variable annuity contracts maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria.

No definition available.

Name:	pl_LiabilitiesRelatedToSeparateAccountsVariableAnnuity
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The liability related to the portion of variable universal life contracts maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria.

No definition available.

Name:	pl_LiabilitiesRelatedToSeparateAccountsVariableUniversalLife
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Non-recourse funding obligations issued by special purpose entities owned by the reporting entity. The funding obligations are direct financial obligations of the special purpose entity and are not guaranteed by the reporting entity.

No definition available.

Name:	pl_NonrecourseFundingObligations
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Data Type:	xbrli:monetaryItemType
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The sum of unearned premiums plus liability for future policy benefits and unpaid claims and claims adjustment expense. Unearned premiums are the carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. Liability for future policy benefits and unpaid claims and claims adjustment expense is the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

No definition available.

Name:	pl_PolicyLiabilitiesAndAccruals
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Represents the liability as of the balance sheet date of amounts related to stable value contracts.

No definition available.

Name:	pl_StableValueProductAccountBalances
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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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No definition available.

Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

Name:	us-gaap_AdditionalPaidInCapital
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Period Type:	instant

No definition available.

Name:	us-gaap_AssetsAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

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-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
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Name:	us-gaap_CollateralizedFinancings
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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Name:	us-gaap_CommitmentsAndContingencies
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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

No definition available.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
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Sum of the carrying amounts as of the balance sheet date of all investments.

Name:	us-gaap_Investments
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Balance Type:	debit
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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

Name:	us-gaap_Liabilities
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Balance Type:	credit
Period Type:	instant

No definition available.

Name:	us-gaap_LiabilitiesAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Name:	us-gaap_LiabilitiesAndStockholdersEquity
Namespace Prefix:	us-gaap_
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Balance Type:	credit
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The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

Name:	us-gaap_LoansInsurancePolicy
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Balance Type:	debit
Period Type:	instant

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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Namespace Prefix:	us-gaap_
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Period Type:	instant

Amount of assets classified as other.

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