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Earnings Per Share | 6 Months Ended
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Jun. 30, 2013
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 June 30, |  | For the Six Months Ended June 30,
| 2012 |  | 2013 |  | 2012 |  | 2013
Numerator |  |  |  |  |  |  |
Net income (controlling interest) | $ | 6.6 |  |  | $ | 64.7 |  |  | $ | 44.0 |  |  | $ | 127.1 |
Denominator |  |  |  |  |  |  |
Average shares outstanding—basic | 51.4 |  |  | 53.1 |  |  | 51.5 |  |  | 52.9 |
Effect of dilutive instruments: |  |  |  |  |  |  |
Stock options and restricted stock | 1.3 |  |  | 1.2 |  |  | 1.3 |  |  | 1.2 |
Forward equity sales | — |  |  | 0.3 |  |  | — |  |  | 0.3 |
Average shares outstanding—diluted | 52.7 |  |  | 54.6 |  |  | 52.8 |  |  | 54.4 |
The diluted earnings per share calculations in the table above exclude the anti-dilutive effect of the following shares:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2012 |  | 2013 |  | 2012 |  | 2013
Stock options and restricted stock | 1.2 |  |  | — |  |  | 1.2 |  |  | — |
Senior convertible securities | 3.7 |  |  | 3.6 |  |  | 3.7 |  |  | 3.6 |
Junior convertible trust preferred securities | 4.1 |  |  | 4.1 |  |  | 4.1 |  |  | 4.1 |
The Company had convertible securities outstanding during the periods presented and is required to apply the if-converted method to these securities in its calculation of diluted earnings per share. Under the if-converted method, shares that are issuable upon conversion are deemed outstanding, regardless of whether the securities are contractually convertible into the Company's common stock at that time. For this calculation, the interest expense (net of tax) attributable to these dilutive securities is added back to Net income (controlling interest), reflecting the assumption that the securities have been converted. Issuable shares for these securities and related interest expense are excluded from the calculation if an assumed conversion would be anti-dilutive to diluted earnings per share. The Company may settle portions of its Affiliate equity and Long-Term Equity Interests Plan awards in shares of its common stock. Because it is the Company's intent to settle these potential repurchases in cash, the calculation of diluted earnings per share excludes any potential dilutive effect from possible share settlements.

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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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6880815&loc=d3e20235-122688 Reference 4: 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 5: 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=16381557&loc=d3e4984-109258 Reference 6: 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 + Details
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