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The Company's limit specified for the first layer in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

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The Company's retention amount specified in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

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Represents losses and settlement expenses assumed.

No definition available.

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Represents earned premium assumed from EMC through the quota share agreement.

No definition available.

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Refers to the amount a catastrophe event must be greater than to be subject to the terms of the treaty.

No definition available.

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Refers to amount of commissions paid by the reinsurance subsidiary to Employers Mutual.

No definition available.

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Refers to cost allocation to the Company not through the pooling agreement.

No definition available.

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Refers to cost allocation to the Company through the pooling agreement.

No definition available.

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Refers to amount of investment expenses allocated to the company by Employers Mutual.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Refers to number of reinsurance treaties in the reinsurance program between the business segment and the Company's parent.

No definition available.

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Price per share of stock in an outstanding offer by the entity's parent company to purchase all outstanding shares of common stock held by others.

No definition available.

Name:	emci_OfferPriceByParent
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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Refers to percentage of pool participation for the property and casualty insurance subsidiaries.

No definition available.

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Data Type:	num:percentItemType
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Period Type:	duration

Refers to the percentage applied to business assumed by the reinsurance subsidiary through the quota share agreement.

No definition available.

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Reinsurance recovered on additional protection purchased (Industry Loss Warranties) in peak exposure territories.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Amount of earned premiums ceded to other entities.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RelatedPartyTransactionLineItems
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