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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock -based compensation expense in operations | Stock-based compensation expense related to continuing operations was included in Selling, general and administrative expenses in the accompanying Consolidated Statements of Operations as follows (in millions):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Compensation expense(1) | $ | 24.9 |  |  | $ | 31.7 |  |  | $ | 26.6 |
(1) Stock-based compensation expense was recorded in our Corporate and other business segment.
Summary of status of undistributed performance share units | A summary of the status of our undistributed performance share units as of December 31, 2017, and changes during the year then ended, is presented below (in millions, except per share data):
| Shares (2) |  | Weighted- Average Grant Date Fair Value per Share
Undistributed performance share units as of December 31, 2016 | 0.4 |  |  | $ | 101.03 |
Granted | 0.1 |  |  | 197.54 |
Adjustment to shares paid based on payout ratio | 0.1 |  |  | 88.26 |
Distributed | (0.2 | ) |  | 81.17 |
Forfeited | — |  |  | — |
Undistributed performance share units as of December 31, 2017 (1) | 0.3 |  |  | $ | 123.80 |
(1) Undistributed performance share units include approximately 0.2 million units with a weighted-average grant date fair value of $154.90 per share that had not yet vested and 0.2 million units that have vested but were not yet distributed. (2) Share amounts are rounded but the balance of undistributed performance share units as of December 31, 2017 accurately reflects actual units undistributed.
Fair value of performance share units and tax deductions | The total fair value of performance share units distributed and the resulting tax deductions to realize tax benefits were as follows (in millions):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Fair value of performance share units distributed | $ | 64.3 |  |  | $ | 39.4 |  |  | $ | 44.9 |
Realized tax benefits from tax deductions | $ | 24.5 |  |  | $ | 15.0 |  |  | $ | 17.1 |
Summary of non vested restricted stock units | A summary of our non-vested restricted stock units as of December 31, 2017 and changes during the year then ended is presented below (in millions, except per share data):
| Shares(2) |  | Weighted- Average Grant Date Fair Value per Share
Non-vested restricted stock units as of December 31, 2016 | 0.3 |  |  | $ | 118.38 |
Granted | 0.1 |  |  | 197.54 |
Distributed | (0.1 | ) |  | 89.33 |
Forfeited | — |  |  | — |
Non-vested restricted stock units as of December 31, 2017(1) | 0.2 |  |  | $ | 156.16 |
Fair value of restricted stock units and tax deductions | The total fair value of restricted stock units vested and the resulting tax deductions to realize tax benefits were as follows (in millions):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Fair value of restricted stock units vested | $ | 19.0 |  |  | $ | 17.0 |  |  | $ | 19.7 |
Realized tax benefits from tax deductions | 7.2 |  |  | 6.5 |  |  | 7.5 |
Summary of stock appreciation rights activity | A summary of our stock appreciation rights as of December 31, 2017, and changes during the year then ended, is presented below (in millions, except per share data):
| Shares |  | Weighted-Average Exercise Price per Share
Outstanding stock appreciation rights as of December 31, 2016 | 1.1 |  |  | $ | 98.35 |
Granted | 0.2 |  |  | 205.53 |
Exercised | (0.2 | ) |  | 70.00 |
Forfeited | — |  |  | — |
Outstanding stock appreciation rights as of December 31, 2017 | 1.1 |  |  | $ | 121.63 |
Exercisable stock appreciation rights as of December 31, 2017 | 0.7 |  |  | $ | 90.43 |
Summary of stock appreciation rights outstanding | The following table summarizes information about stock appreciation rights outstanding as of December 31, 2017 (in millions, except per share data and years):
|  | Stock Appreciation Rights Outstanding |  | Stock Appreciation Rights Exercisable
Range of Exercise Prices |  | Shares |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value |  | Shares |  | Weighted-Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value
$34.06 to $81.14 |  | 0.3 |  |  | 2.21 |  | $ | 49.3 |  |  | 0.3 |  |  | 2.21 |  | $ | 49.3 |
$92.64 to $ 131.94 |  | 0.3 |  |  | 4.52 |  | $ | 31.9 |  |  | 0.3 |  |  | 4.42 |  | $ | 27.5 |
$156.94 to $205.53 |  | 0.4 |  |  | 6.45 |  | $ | 12.1 |  |  | 0.1 |  |  | 6.00 |  | $ | 3.9 |
Schedule of total intrinsic value of stock appreciation rights exercised | The total intrinsic value of stock appreciation rights exercised and the resulting tax deductions to realize tax benefits were as follows (in millions):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Intrinsic value of stock appreciation rights exercised | $ | 25.1 |  |  | $ | 36.9 |  |  | $ | 27.3 |
Realized tax benefits from tax deductions | $ | 9.6 |  |  | $ | 14.1 |  |  | $ | 10.4 |
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of share-based payment awards | The following table provides information on our performance share units:
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Compensation expense for performance share units (in millions) | $ | 12.2 |  |  | $ | 18.1 |  |  | $ | 13.6 |
Weighted-average fair value of grants, per share | $ | 197.54 |  |  | $ | 150.21 |  |  | $ | 126.31 |
Payout ratio for shares paid | 185.9 | % |  | 200.0 | % |  | 200.0 | %
Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of share-based payment awards | The following table provides information on our restricted stock units (in millions, except per share data):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Compensation expense for restricted stock units | $ | 8.3 |  |  | $ | 9.0 |  |  | $ | 8.3 |
Weighted-average fair value of grants, per share | $ | 197.54 |  |  | $ | 150.14 |  |  | $ | 126.15 |
Stock Appreciation Rights [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of share-based payment awards | The following table provides information on our stock appreciation rights (in millions, except per share data):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Compensation expense for stock appreciation rights | $ | 4.4 |  |  | $ | 4.6 |  |  | $ | 4.7 |
Weighted-average fair value of grants, per share | 32.32 |  |  | 22.93 |  |  | 22.74 |
Schedule of assumptions used | The fair value of the stock appreciation rights granted in 2017, 2016 and 2015 were estimated on the date of grant using the following assumptions:
| 2017 |  | 2016 |  | 2015
Expected dividend yield | 1.47 | % |  | 1.62 | % |  | 1.61 | %
Risk-free interest rate | 2.02 | % |  | 1.66 | % |  | 1.36 | %
Expected volatility | 19.97 | % |  | 19.60 | % |  | 23.78 | %
Expected life (in years) | 3.95 |  |  | 3.99 |  |  | 4.00 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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