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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Option Activity | The following summarizes stock option activity:
| Option Shares |  | Weighted Average Exercise Price
(in millions) | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Outstanding, at beginning of year | 2.3 |  |  | 2.6 |  |  | 2.1 |  |  | $ | 11.08 |  |  | $ | 10.71 |  |  | $ | 10.29 |
Granted | 0.3 |  |  | 0.5 |  |  | 0.7 |  |  | 23.14 |  |  | 15.30 |  |  | 12.69 |
Exercised | (0.2 | ) |  | (0.3 | ) |  | (0.1 | ) |  | 9.49 |  |  | 10.53 |  |  | 8.39 |
Canceled or expired | — |  |  | (0.5 | ) |  | (0.1 | ) |  | 18.03 |  |  | 14.10 |  |  | 15.77 |
Outstanding, at end of year | 2.4 |  |  | 2.3 |  |  | 2.6 |  |  | $ | 12.51 |  |  | $ | 11.08 |  |  | $ | 10.71 |
Exercisable, at end of year | 1.8 |  |  | 1.6 |  |  | 1.6 |  |  | $ | 10.59 |  |  | $ | 9.57 |  |  | $ | 8.96 |
Summary of Information Concerning Stock Options Outstanding | The following table summarizes information for stock options outstanding as of December 31, 2018 under all plans:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Shares |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
| (in millions) |  | (in years) |  |  |  | (in millions) |  |
$5.01 — $10.00 | 0.9 |  |  | 3.2 |  | $ | 6.59 |  |  | 0.9 |  |  | $ | 6.59 |
10.01 — 15.00 | 0.8 |  |  | 6.7 |  | 13.12 |  |  | 0.6 |  |  | 13.26 |
15.01 — 20.00 | 0.5 |  |  | 7.2 |  | 16.51 |  |  | 0.3 |  |  | 16.29 |
20.01 — 25.00 | 0.2 |  |  | 9.3 |  | 23.14 |  |  | — |  |  | 23.14 |
| 2.4 |  |  | 5.8 |  | $ | 12.51 |  |  | 1.8 |  |  | $ | 10.59 |
Summary of Restricted Stock Grants | The following table summarizes restricted stock activity for the year ended December 31, 2018:
| Number of Restricted Shares |  | Weighted Average Price per Share
| (in millions) |  |
Outstanding and non-vested, at December 31, 2017 | 0.2 |  |  | $ | 15.52 |
Granted | 0.1 |  |  | 22.85 |
Vested | (0.1 | ) |  | 18.23 |
Forfeited | — |  |  | 17.48 |
Outstanding and non-vested, at December 31, 2018 | 0.2 |  |  | $ | 18.12 |
Equity Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used to Calculate Fair Value | The fair value of each option grant was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:
| 2018 |  | 2017 |  | 2016
Dividend yield | 1.4 | % |  | 1.7 | % |  | 2.2 | %
Expected volatility | 32 | % |  | 45 | % |  | 43 | %
Risk free interest rate | 2.9 | % |  | 2.2 | % |  | 1.3 | %
Weighted average expected option life in years | 5.9 |  |  | 7.5 |  |  | 5.8 |
PSUs |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity | The following table summarizes PSU activity for the year ended December 31, 2018:
| Number of PSUs |  | Weighted Average Price per Share
| (in millions) |  |
Outstanding and non-vested, at December 31, 2017 | 0.3 |  |  | $ | 15.19 |
Granted | 0.1 |  |  | 23.14 |
Vested | (0.1 | ) |  | 12.87 |
Forfeited | — |  |  | 16.30 |
Outstanding and non-vested, at December 31, 2018 | 0.3 |  |  | $ | 20.13 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- 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
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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
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- 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
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