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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Share | 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 |
Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings Per Share | 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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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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