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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock Based Compensation Expense | The following table provides information regarding the Company’s stock-based compensation expense:
| Three months ended June 30, |  | Six months ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation | $ | 29.0 |  |  | $ | 28.0 |  |  | $ | 54.3 |  |  | $ | 54.0 |
Tax effect recognized in net earnings | 6.1 |  |  | 5.9 |  |  | 11.4 |  |  | 11.3 |
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:
| Six months ended June 30,
| 2019 |  | 2018
Risk-free interest rate (%) | 2.42 |  | 2.63
Expected option life (years) | 5.41 |  | 5.32
Expected volatility (%) | 19.23 |  | 18.02
Expected dividend yield (%) | 0.58 |  | 0.59

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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