XML 76 R48.htm IDEA: XBRL DOCUMENT v3.10.0.1

Share-Based Payments (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule Of Share-Based Compensation Plan Approval

Plan	Approvals
Stock Plan	Approved effective as of May 1, 2014 by stockholders on April 23, 2014. Most recently amended and restated plan was approved effective May 2, 2018 by stockholders on May 2, 2018.
Cash Plan	Approved effective April 1, 2005 by stockholders on April 27, 2005. Most recently amended and restated plan was approved effective May 1, 2014 by stockholders on April 23, 2014.
ESPP	Approved by stockholders on April 29, 2009 effective July 1, 2009.
Agent Plan	Approved by stockholders on April 26, 2006. Most recently amended and restated plan was approved on December 13, 2016 by the Parent's Board of Directors' Salary and Employee Benefits Committee. The amendment was effective February 1, 2017.

Schedule of Types of Share-Based Payments Issued

Plan	Types of Share-Based Payments Issued
Stock Plan	Qualified and nonqualified stock options, stock appreciation rights ("SARs"), restricted stock, restricted stock units ("RSUs"), stock grants, and other awards valued in whole or in part by reference to the Parent's common stock. The maximum exercise period for an option grant under this plan is 10 years from the date of the grant. Dividend equivalent units ("DEUs") are earned during the vesting period on RSU grants. The DEUs are reinvested in the Parent's common stock at fair value on each dividend payment date. The requisite service period for grants to employees under this plan is the lesser of: (i) the stated vested date, which is typically three years from issuance; or (ii) the date the employee becomes eligible to retire.
Cash Plan	Cash incentive units (“CIUs”). The initial dollar value of each CIU will be adjusted to reflect the percentage increase or decrease in the total shareholder return on the Parent's common stock over a specified performance period. In addition, for certain grants, the number of CIUs granted will be increased or decreased to reflect our performance on specified performance indicators as compared to targeted peer companies. The requisite service period for grants under this plan is the lesser of: (i) the stated vested date, which is typically three years from issuance; or (ii) the date the employee becomes eligible to retire.
ESPP	Enables employees to purchase shares of the Parent’s common stock. The purchase price is the lower of: (i) 85% of the closing market price at the time the option is granted; or (ii) 85% of the closing price at the time the option is exercised. Shares are generally issued on June 30 and December 31 of each year.
Agent Plan	Quarterly offerings to purchase the Parent's common stock at a 10% discount with a one year restricted period during which the shares purchased cannot be sold or transferred. Only our independent retail insurance agencies and wholesale general agencies, and certain eligible persons associated with the agencies, are eligible to participate in this plan.

Schedule of Share-Based Compensation Shares Authorized and Available for Issuance

As of December 31, 2018	Authorized		Available for Issuance		Awards Outstanding
Stock Plan	4,750,000		3,461,192		864,478
ESPP	1,500,000		429,181		—
Agent Plan	3,000,000		1,776,359		—

Schedule of Share-Based Compensation Retired Plans

December 31, 2018	Types of Share-Based Payments Issued	Reserve Shares		Awards Outstanding1
Plan
2005 Omnibus Stock Plan ("2005 Stock Plan")	Qualified and nonqualified stock options, SARs, restricted stock, RSUs, phantom stock, stock bonuses, and other awards in such amounts and with such terms and conditions as it determined, subject to the provisions of the 2005 Stock Plan. The maximum exercise period for an option grant under this plan is 10 years from the date of the grant. DEUs are earned during the vesting period on RSU grants. The DEUs are reinvested in the Parent's common stock at fair value on each dividend payment date.	2,099,403		174,003
Parent's Stock Compensation Plan for Non-employee Directors ("Directors Stock Compensation Plan")	Directors could elect to receive a portion of their annual compensation in shares of the Parent's common stock.	65,770		65,770

¹Awards outstanding under the 2005 Stock Plan consisted of 47,268 shares deferred by our non-employee directors and 126,735 stock options.

Schedule of Summary of Restricted Stock Units Transactions under Share-Based Payment Plans

		Number of Shares			Weighted Average Grant Date Fair Value
Unvested RSU awards at December 31, 2017		865,587			$	33.66
Granted in 2018		303,550			55.96
Vested in 2018		(303,606	)		26.57
Forfeited in 2018		(19,226	)		42.62
Unvested RSU awards at December 31, 2018		846,305			$	44.00

Schedule of Summary of Stock Option Transactions under Share Based Payment Plans

		Number of Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value ($ in thousands)
Outstanding at December 31, 2017		229,864			$	15.38
Granted in 2018		—			—
Exercised in 2018		(103,129	)		16.62
Forfeited or expired in 2018		—			—
Outstanding at December 31, 2018		126,735			$	14.37			0.80		$	5,903
Exercisable at December 31, 2018		126,735			$	14.37			0.80		$	5,903

Schedule of Share-Based Compensation ESPP and ASPP Shares Granted

	2018		2017		2016
ESPP Issuances	70,448		75,093		88,432
Agent Plan Issuances	41,134		49,794		69,867

Schedule of Weighted Average Assumptions for Employee Stock Purchase Plan

		ESPP
		2018			2017		2016
Risk-free interest rate		1.88	%		1.07		0.47
Expected term		6 months			6 months		6 months
Dividend yield		1.3	%		1.3		1.7
Expected volatility		18	%		24		31

Schedule of Weighted-Average Fair Value of Options and Stock Per Share

		2018				2017			2016
RSUs		$	55.96			42.66			32.53
ESPP:
Six month option		2.67				2.73			2.63
Discount of grant date market value		8.50				7.06			5.23
Total ESPP		11.17				9.79			7.86
Agent Plan:
Discount of grant date market value		5.99				5.04			3.79

Schedule of Compensation Cost for Share-based Payment Arrangements

($ in millions)	2018				2017			2016
Share-based compensation expense, pre-tax	$	19.3			31.2			30.3
Income tax benefit, including the benefit related to stock grants that have vested during the year	(7.0		)		(15.0	)		(10.3	)
Share-based compensation expense, after-tax	$	12.3			16.2			20.0

X

- Definition

[Table Text Block] for Table that provides information regarding the approval of active share-based compensation plans.

+ References

No definition available.

+ Details

Name:	sigi_ScheduleOfShareBasedCompensationPlanApprovalTableTextBlock
Namespace Prefix:	sigi_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of Share-Based Compensation ESPP and ASPP Shares Issued.

+ References

No definition available.

+ Details

Name:	sigi_ScheduleofShareBasedCompensationESPPandASPPSharesIssuedTableTextBlock
Namespace Prefix:	sigi_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of Schedule of Share-Based Compensation Retired Plans including reserve shares and awards outstanding.

+ References

No definition available.

+ Details

Name:	sigi_ScheduleofShareBasedCompensationRetiredPlansTableTextBlock
Namespace Prefix:	sigi_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of Share-Based Compensation Shares Authorized, Available for Issuance, and Outstanding [Table]

+ References

No definition available.

+ Details

Name:	sigi_ScheduleofShareBasedCompensationSharesAuthorizedAvailableforIssuanceandOutstandingTableTextBlock
Namespace Prefix:	sigi_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Table that provides the types of share-based compensation that is issued.

+ References

No definition available.

+ Details

Name:	sigi_ScheduleofTypesofShareBasedPaymentsIssuedTableTextBlock
Namespace Prefix:	sigi_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration