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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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 June 30, |  | For the Six Months Ended June 30,
| 2017 |  | 2018 |  | 2017 |  | 2018
Numerator |  |  |  |  |  |  |
Net income (controlling interest) | $ | 126.3 |  |  | $ | 117.0 |  |  | $ | 248.8 |  |  | $ | 270.0 |
Interest expense on convertible securities, net of taxes | 3.9 |  |  | — |  |  | 7.8 |  |  | 9.5 |
Net income (controlling interest), as adjusted | $ | 130.2 |  |  | $ | 117.0 |  |  | $ | 256.6 |  |  | $ | 279.5 |
Denominator |  |  |  |  |  |  |
Average shares outstanding (basic) | 56.3 |  |  | 54.0 |  |  | 56.5 |  |  | 54.3 |
Effect of dilutive instruments: |  |  |  |  |  |  |
Stock options and restricted stock units | 0.2 |  |  | 0.2 |  |  | 0.3 |  |  | 0.3 |
Convertible securities | 2.2 |  |  | — |  |  | 2.2 |  |  | 2.2 |
Average shares outstanding (diluted) | 58.7 |  |  | 54.2 |  |  | 59.0 |  |  | 56.8 |
Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings Per Share | 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 share-based awards:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2017 |  | 2018 |  | 2017 |  | 2018
Stock options and restricted stock units | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |
Convertible securities | — |  |  | 2.2 |  |  | — |  |  | — |

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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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