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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Amounts Charged to Income for Employees Incentive Compensation Plans | The amounts charged to income for Progressive and ARX incentive compensation plans for the years ended December 31, were:
| 2017 |  | 2016 |  | 2015
(millions) | Pretax |  | After Tax |  |  | Pretax |  | After Tax |  |  | Pretax |  | After Tax |
Non-equity incentive plans – cash | $ | 461.3 |  | $ | 299.8 |  |  | $ | 386.8 |  | $ | 251.4 |  |  | $ | 337.7 |  | $ | 219.5 |
Equity incentive plans: |  |  |  |  |  |  |  |
Equity awards | 92.9 |  | 60.4 |  |  | 80.9 |  | 52.6 |  |  | 64.5 |  | 41.9 |
Liability awards | 2.5 |  | 1.6 |  |  | 4.3 |  | 2.8 |  |  | 1.7 |  | 1.1 |
Assets Held in Deferral Plan Irrevocable Grantor Trust Account | The Deferral Plan Irrevocable Grantor Trust account held the following assets at December 31:
(millions) | 2017 |  | 2016 |
Progressive common shares 1 | $ | 128.2 |  | $ | 122.2 |
Other investment funds 2 | 167.0 |  | 136.9 |
Total | $ | 295.2 |  | $ | 259.1 |
1 Included 4.4 million and 4.7 million common shares as of December 31, 2017 and 2016, respectively, to be distributed in common shares. 2 Amount is included in other assets on the balance sheet.
Employee |
Summary of Restricted Stock Activity | A summary of all employee restricted equity award activity during the years ended December 31, follows:
| 2017 |  | 2016 |  | 2015
Restricted Equity Awards | Number of Shares 1 |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares 1 |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares 1 |  | Weighted Average Grant Date Fair Value |
Beginning of year | 6,951,373 |  | $ | 26.18 |  |  | 7,725,227 |  | $ | 23.37 |  |  | 9,051,564 |  | $ | 21.27 |
Add (deduct): |  |  |  |  |  |  |  |
Granted 2 | 2,383,475 |  | 32.01 |  |  | 1,870,660 |  | 31.54 |  |  | 2,489,976 |  | 25.20 |
Vested | (3,220,671 | ) | 22.53 |  |  | (2,422,700 | ) | 21.50 |  |  | (3,682,644 | ) | 19.53 |
Forfeited | (255,329 | ) | 28.03 |  |  | (221,814 | ) | 24.64 |  |  | (133,669 | ) | 21.63 |
End of year 3,4 | 5,858,848 |  | $ | 30.47 |  |  | 6,951,373 |  | $ | 26.18 |  |  | 7,725,227 |  | $ | 23.37 |
1 Includes restricted stock units; 2015 also includes restricted stock. Upon vesting, all units will be converted on a one-for-one basis into Progressive common shares funded from existing treasury shares. All performance-based awards are included at their target amounts. 2 We reinvest dividend equivalents on restricted stock units. For 2017, 2016, and 2015, the number of units “granted” shown in the table above includes 157,396, 165,045, and 196,947 of dividend equivalent units, respectively, at a weighted average grant date fair value of $0, since the dividends were factored into the grant date fair value of the original grant. 3 At December 31, 2017, the number of shares included 1,513,779 performance-based units at their target amounts. We expect 3,244,111 units to vest based upon our current estimates of the likelihood of achieving the pre-determined performance goals applicable to each award. 4 At December 31, 2017, the total unrecognized compensation cost related to unvested equity awards was $87.1 million, which includes performance-based awards at their currently estimated vesting value. This compensation expense will be recognized into the income statement over the weighted average vesting period of 2.2 years.
Director |
Summary of Restricted Stock Activity | A summary of all directors’ restricted stock activity during the years ended December 31, follows:
| 2017 |  | 2016 |  | 2015
Restricted Stock | Number of Shares |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  | Weighted Average Grant Date Fair Value |
Beginning of year | 55,839 |  | $ | 33.24 |  |  | 89,427 |  | $ | 27.23 |  |  | 81,579 |  | $ | 25.45 |
Add (deduct): |  |  |  |  |  |  |  |
Granted | 53,284 |  | 40.54 |  |  | 55,839 |  | 33.24 |  |  | 89,427 |  | 27.23 |
Vested | (55,839 | ) | 33.24 |  |  | (89,427 | ) | 27.23 |  |  | (81,579 | ) | 25.45 |
End of year | 53,284 |  | $ | 40.54 |  |  | 55,839 |  | $ | 33.24 |  |  | 89,427 |  | $ | 27.23 |
Employee Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] | A summary of all ARX employee stock option activity since acquisition, follows:
| 2017 |  | 2016 |  | 2015
Options Outstanding | Number of Shares |  | Weighted Average Exercise Price |  |  | Number of Shares |  | Weighted Average Exercise Price |  |  | Number of Shares |  | Weighted Average Exercise Price |
Beginning of year | 24,995 |  | $ | 526.46 |  |  | 24,995 |  | $ | 526.46 |  |  | NA |  | NA |
At acquisition date 4/1/2015 | NA |  | NA |  |  | NA |  | NA |  |  | 26,000 |  | $ | 513.72 |
Add (deduct): |  |  |  |  |  |  |  |
Exercised 1 | (2,445 | ) | 174.65 |  |  | 0 |  | 0 |  |  | (1,005 | ) | 197.01 |
End of year | 22,550 |  | $ | 564.60 |  |  | 24,995 |  | $ | 526.46 |  |  | 24,995 |  | $ | 526.46 |
Exercisable, end of year | 17,950 |  | $ | 517.75 |  |  | 16,995 |  | $ | 438.77 |  |  | 12,995 |  | $ | 386.69 |
NA = Not Applicable 1 At the time of exercise in 2017 and 2015, the value earned by the option holders was $2.9 million and $1.1 million, respectively.
| 2017 |  | 2016 |  | 2015
Non-Vested Options Outstanding | Number of Shares |  | Weighted Average Exercise Price |  |  | Number of Shares |  | Weighted Average Exercise Price |  |  | Number of Shares |  | Weighted Average Exercise Price |
Beginning of year | 8,000 |  | $ | 712.74 |  |  | 12,000 |  | $ | 677.81 |  |  | NA |  | NA |
At acquisition date 4/1/2015 | NA |  | NA |  |  | NA |  | NA |  |  | 14,800 |  | $ | 675.55 |
Add (deduct): |  |  |  |  |  |  |  |
Vested | (3,400 | ) | 665.79 |  |  | (4,000 | ) | 607.95 |  |  | (2,800 | ) | 665.85 |
End of year 1 | 4,600 |  | $ | 747.45 |  |  | 8,000 |  | $ | 712.74 |  |  | 12,000 |  | $ | 677.81 |
NA = Not Applicable 1 At December 31, 2017, 2016, and 2015, the remaining unrecognized compensation cost related to unvested options was $0.7 million, $1.6 million, and $2.9 million, respectively, and the remaining weighted average vesting period on the unvested awards was 1.01 years, 1.36 years, and 1.72 years, respectively.

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