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Earnings Per Share | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The calculation of basic earnings per share is based on the weighted average number of shares of the Company’s common stock outstanding during the period. Diluted earnings per share is similar to basic earnings per share, but adjusts for the dilutive effect of the potential issuance of incremental shares of the Company’s common stock. The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share available to common stockholders.
| For the Three Months Ended March 31,
| 2015 |  | 2016
Numerator |  |  |
Net income (controlling interest) | $ | 128.0 |  |  | $ | 104.5 |
Convertible securities interest expense, net | 3.8 |  |  | 3.8 |
Net income (controlling interest), as adjusted | $ | 131.8 |  |  | $ | 108.3 |
Denominator |  |  |
Average shares outstanding (basic) | 54.8 |  |  | 54.0 |
Effect of dilutive instruments: |  |  |
Stock options and restricted stock | 0.8 |  |  | 0.3 |
Junior convertible securities | 2.2 |  |  | 2.2 |
Average shares outstanding (diluted) | 57.8 |  |  | 56.5 |
The diluted earnings per share calculations in the table above exclude stock options and restricted stock units for which performance or market conditions were not met and the anti-dilutive effect of the following items:
| For the Three Months Ended March 31,
| 2015 |  | 2016
Stock options and restricted stock units | 0.1 |  |  | 0.7 |

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