Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Retirement and Share-based Compensation Plans (Stock Option Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, intrinsic value	$ 31.3
Options vested and expected to vest, intrinsic value	31.3
Proceeds from stock options exercised	8.1	$ 13.7	$ 31.8
Tax benefit from stock options exercised	$ 0.0	1.0	$ 1.0
Stock Option Plans, 1996 Stock Option Plan, 2000 Employee Stock Option Plan, 2000 Directors Stock Option Plan, 2011 Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	3,475,000
Duration of award	10 years
Stock Option Plans, 1996 Stock Option Plan, 2000 Employee Stock Option Plan, 2000 Directors Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	6 months
Stock Option Plans, 2011 Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Number of shares available for future grant	18,000
Stock Option Plans, Independent Insurance Agent Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	8,000,000
Duration of award			7 years
Award vesting period			6 months
Options, grants in period, net of forfeitures			1,284,950
Commission expense			$ 8.1
Stock Option Plans, All Stock Option Plans For Officers, Directors And Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised in period, total intrinsic value	$ 1.4	$ 5.4	$ 10.4