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Earnings Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The calculation of Earnings per share (basic) is based on the weighted average number of shares of the Company’s common stock outstanding during the period. Earnings per share (diluted) is similar to Earnings per share (basic), 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 September 30, |  | For the Nine Months Ended September 30,
| 2017 |  | 2018 |  | 2017 |  | 2018
Numerator |  |  |  |  |  |  |
Net income (controlling interest) | $ | 125.4 |  |  | $ | 124.9 |  |  | $ | 374.2 |  |  | $ | 394.9 |
Interest expense on convertible securities, net of taxes | 3.9 |  |  | 4.7 |  |  | 11.6 |  |  | 14.2 |
Net income (controlling interest), as adjusted | $ | 129.3 |  |  | $ | 129.6 |  |  | $ | 385.8 |  |  | $ | 409.1 |
Denominator |  |  |  |  |  |  |
Average shares outstanding (basic) | 55.8 |  |  | 53.1 |  |  | 56.3 |  |  | 53.9 |
Effect of dilutive instruments: |  |  |  |  |  |  |
Stock options and restricted stock units | 0.3 |  |  | 0.1 |  |  | 0.3 |  |  | 0.2 |
Convertible securities | 2.2 |  |  | 2.2 |  |  | 2.2 |  |  | 2.2 |
Average shares outstanding (diluted) | 58.3 |  |  | 55.4 |  |  | 58.8 |  |  | 56.3 |
Average shares outstanding (diluted) in the table above excludes share-based awards that have not satisfied performance conditions and the anti-dilutive effect of the following:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2017 |  | 2018 |  | 2017 |  | 2018
Stock options and restricted stock units | 0.0 |  |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
The Company may settle portions of its Affiliate equity purchases in shares of its common stock. Because it is the Company’s intention to settle these potential purchases in cash, the calculation of Average shares outstanding (diluted) excludes any potential dilutive effect from possible share settlements of Affiliate equity purchases. In the three and nine months ended September 30, 2018, the Company repurchased 0.8 million and 2.5 million shares, respectively, of its common stock at an average price per share of $146.85 and $166.19, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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