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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Based Compensation Expense | The following table provides information regarding the Company’s stock-based compensation expense:
| Three months ended September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock-based compensation | $ | 27.1 |  |  | $ | 23.7 |  |  | $ | 81.1 |  |  | $ | 67.6 |
Tax effect recognized in net earnings | 5.7 |  |  | 8.3 |  |  | 17.0 |  |  | 23.7 |
Weighted Average Assumptions Used to Value Option Grants | The following weighted average assumptions were used to estimate the fair value of options granted during current and prior year periods using the Black-Scholes option-pricing model:
| Nine months ended September 30,
| 2018 |  | 2017
Risk-free interest rate (%) | 2.63 |  | 2.03
Expected option life (years) | 5.32 |  | 5.26
Expected volatility (%) | 18.04 |  | 18.76
Expected dividend yield (%) | 0.59 |  | 0.67

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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