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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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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
Namespace Prefix:	pl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	pl_AssetsRelatedToSeparateAccountsAbstract
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Balance Type:	na
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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.

Name:	pl_AssetsRelatedToSeparateAccountsVariableAnnuity
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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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Balance Type:	debit
Period Type:	instant

No definition available.

Name:	pl_LiabilitiesRelatedToSeparateAccountsAbstract
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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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Balance Type:	credit
Period Type:	instant

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
Namespace Prefix:	pl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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Period Type:	instant

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

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Period Type:	instant

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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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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

No definition available.

Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

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

No definition available.

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

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6506951

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Name:	us-gaap_Cash
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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-Publisher FASB
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-Topic 235
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Name:	us-gaap_CollateralizedFinancings
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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.

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

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

No definition available.

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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Name:	us-gaap_DeferredIncomeTaxLiabilitiesNet
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Carrying (unamortized) amount as of the balance sheet date of deferred policy acquisition costs and value of business acquired (also called present value of future profits).

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Name:	us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired
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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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-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	debit
Period Type:	instant

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

Name:	us-gaap_IncomeTaxReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Sum of the carrying amounts as of the balance sheet date of all investments.

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	us-gaap_LiabilitiesAbstract
Namespace Prefix:	us-gaap_
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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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-Paragraph 3
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Name:	us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation.

Name:	us-gaap_MarketableSecuritiesEquitySecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For an unclassified balance sheet, this item represents investments in debt securities having predetermined or determinable maturity dates.

Name:	us-gaap_MarketableSecuritiesFixedMaturities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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.

Name:	us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of assets classified as other.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.