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Earnings Per Share | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in millions, except per share data):
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2016 |  | 2015 |  | 2016 |  | 2015
Numerator: |  |  |  |  |  |  |
Net income attributable to Packaging Corporation of America | $ | 119.3 |  |  | $ | 127.8 |  |  | $ | 338.9 |  |  | $ | 332.6 |
Less: distributed and undistributed earnings allocated to participating securities | (1.1 | ) |  | (1.5 | ) |  | (3.4 | ) |  | (4.0 | )
Net income attributable to common shareholders | $ | 118.2 |  |  | $ | 126.3 |  |  | $ | 335.5 |  |  | $ | 328.6 |
Denominator: |  |  |  |  |  |  |
Weighted average basic common shares outstanding | 93.4 |  |  | 96.5 |  |  | 93.6 |  |  | 96.8 |
Effect of dilutive securities | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Weighted average diluted common shares outstanding | 93.6 |  |  | 96.6 |  |  | 93.7 |  |  | 96.9 |
Basic income per common share | $ | 1.27 |  |  | $ | 1.31 |  |  | $ | 3.59 |  |  | $ | 3.39 |
Diluted income per common share | $ | 1.26 |  |  | $ | 1.31 |  |  | $ | 3.58 |  |  | $ | 3.39 |

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