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Earnings Per Share | 3 Months Ended
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Mar. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is computed as net earnings divided by the basic weighted average common shares outstanding of 49.1 million and 47.6 million shares for the three months ended March 31, 2017 and 2016, respectively. The calculation of diluted earnings per share includes the effect of any dilutive equity incentive instruments. The Company uses the treasury stock method to calculate the effect of outstanding dilutive equity incentive instruments, which requires the Company to compute total proceeds as the sum of the amount the employee must pay upon exercise of the award and the amount of unearned stock-based compensation costs attributable to future services. Equity incentive instruments for which the total employee proceeds from exercise exceed the average fair value of the same equity incentive instrument over the period have an anti-dilutive effect on earnings per share during periods with net earnings, and accordingly, the Company excludes them from the calculation. Anti-dilutive equity instruments of 1.0 million and 3.2 million class A common shares were excluded from the computation of diluted net earnings per share for the three months ended March 31, 2017 and 2016, respectively. Reconciliations of the numerator and the denominator of the basic and diluted per share computations for the Company's common stock, for the three months ended March 31, 2017 and 2016, are summarized as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Numerator |  |  |
Net earnings | $ | 25.4 |  |  | $ | 3.8 |
Denominator |  |  |
Basic weighted average number of common shares outstanding for all classes of common shares | 49.1 |  |  | 47.6 |
Plus: effect of dilutive equity incentive instruments | 2.4 |  |  | 0.9 |
Diluted weighted average number of common shares outstanding for all classes of common shares | 51.5 |  |  | 48.5 |
Earnings per share |  |  |
Basic | $ | 0.52 |  |  | $ | 0.08 |
Diluted | $ | 0.49 |  |  | $ | 0.08 |
Cash dividends paid per common share for all classes of common shares | $ | 0.30 |  |  | $ | 0.30 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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