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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Effect of New Accounting Pronouncement | Our retrospective adoption of the update to ASC 323 as of January 1, 2015 will result in a cumulative effect decrease in stockholders' equity as of January 1, 2015, 2014, and 2013 of approximately $30 million, $19 million, and $8 million, respectively. Our net income and earnings per share assuming dilution will be impacted as follows:
(in millions, except per share data) | Year Ended December 31
| 2014 |  | 2013 |  | 2012
|  |  | per share |  |  |  | per share |  |  |  | per share
Net Income, Before Adoption | $ | 413.4 |  |  | $ | 1.61 |  |  | $ | 858.1 |  |  | $ | 3.23 |  |  | $ | 894.4 |  |  | $ | 3.17 |
After-tax Impact of Adoption | (11.3 | ) |  | (0.04 | ) |  | (11.1 | ) |  | (0.04 | ) |  | (6.3 | ) |  | (0.02 | )
Net Income, After Adoption | $ | 402.1 |  |  | $ | 1.57 |  |  | $ | 847.0 |  |  | $ | 3.19 |  |  | $ | 888.1 |  |  | $ | 3.15 |

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