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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-Based Compensation Plans [Abstract] |
Stock Option Activity | Stock option activity for the three years ended December 31, 2017 was:
| 2017 |  | 2016 |  | 2015
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
January 1 | 719,757 |  |  | $27.88 |  | 1,140,547 |  |  | $28.86 |  | 1,652,140 |  |  | $27.97
Granted | 1,000,000 |  |  | $84.94 |  | — |  |  |  |  | — |  |  |
Exercised | (102,335 | ) |  | $23.40 |  | (420,790 | ) |  | $30.56 |  | (511,593 | ) |  | $25.98
Forfeited | (24,000 | ) |  | $84.94 |  | — |  |  |  |  | — |  |  |
December 31 | 1,593,422 |  |  | $63.11 |  | 719,757 |  |  | $27.88 |  | 1,140,547 |  |  | $28.86
Exercisable December 31 | 617,422 |  |  | $28.61 |  | 695,757 |  |  | $26.54 |  | 1,074,547 |  |  | $26.47
Options Outstanding and Exercisable | Options outstanding and exercisable at December 31, 2017 were:
|  |  |  | Options Outstanding |  | Options Exercisable
Exercise Price Range |  | Shares |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
$23.00 | to | $24.00 |  | 545,422 |  |  | 1.2 years |  | $23.40 |  | 545,422 |  |  | $23.40
$66.00 | to | $71.00 |  | 72,000 |  |  | 6.4 years |  | $68.04 |  | 72,000 |  |  | $68.04
$84.00 | to | $85.00 |  | 976,000 |  |  | 5.2 years |  | $84.94 |  | — |  |  |
|  |  |  | 1,593,422 |  |  |  |  |  |  | 617,422 |  |  |
Restricted Stock Activity | Restricted stock activity for the three years ended December 31, 2017 was:
| 2017 |  | 2016 |  | 2015
January 1 | 3,802,105 |  |  | 4,349,105 |  |  | 5,040,641 |
Granted | 966,919 |  |  | 1,100,396 |  |  | 1,208,964 |
Vested | (1,757,269 | ) |  | (1,438,386 | ) |  | (1,631,343 | )
Forfeited | (152,382 | ) |  | (209,010 | ) |  | (269,157 | )
December 31 | 2,859,373 |  |  | 3,802,105 |  |  | 4,349,105 |
Weighted average grant date fair value of shares granted in the period | $74.10 |  | $73.16 |  | $64.49
Weighted average grant date fair value at December 31 | $68.85 |  | $61.72 |  | $55.08
Performance Restricted Stock Units Activity | PRSU activity for the three years ended December 31, 2017 was:
| 2017 |  | 2016 |  | 2015
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
January 1 | 462,381 |  |  | $ | 77.05 |  |  | 534,456 |  |  | $ | 66.05 |  |  | 622,859 |  |  | $ | 56.16 |
Granted | 173,770 |  |  | 84.94 |  |  | 153,492 |  |  | 83.23 |  |  | 161,625 |  |  | 77.68 |
Distributed | (147,264 | ) |  | 69.89 |  |  | (225,567 | ) |  | 55.20 |  |  | (239,387 | ) |  | 48.94 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (10,641 | ) |  | 48.87 |
December 31 | 488,887 |  |  | $ | 82.01 |  |  | 462,381 |  |  | $ | 77.05 |  |  | 534,456 |  |  | $ | 66.05 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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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