Earnings Per Share The reconciliation of basic income per share to diluted income per share is shown in the following table: | | | | | | | | | | | | | (millions, except per-share data) | 2015 | | 2014 | | 2013 | Income from continuing operations | $ | 991 |
| | $ | 39 |
| | $ | 48 |
| Net income (loss) attributable to noncontrolling interest | — |
| | 1 |
| | $ | (1 | ) | Income from continuing operations attributable to USG | $ | 991 |
| | $ | 38 |
| | $ | 49 |
| Loss from discontinued operations | — |
| | (1 | ) | | (2 | ) | Net income attributable to USG | $ | 991 |
| | $ | 37 |
| | $ | 47 |
| Effect of dilutive securities - Deferred compensation program for non-employee directors | (1 | ) | | — |
| | — |
| Income available to shareholders | $ | 990 |
| | $ | 37 |
| | $ | 47 |
| | | | | | | Average common shares | 145.5 |
| | 141.7 |
| | 108.9 |
| Dilutive RSUs, MSUs, performance shares and stock options | 1.6 |
| | 2.4 |
| | 2.5 |
| Deferred shares associated with a deferred compensation program for non-employee directors | 0.1 |
| | 0.2 |
| | — |
| Average diluted common shares | 147.2 |
| | 144.3 |
| | 111.4 |
| | | | | | | Basic earnings (loss) per average common share: | | | | | | Income from continuing operations attributable to USG | $ | 6.81 |
| | $ | 0.27 |
| | $ | 0.45 |
| Loss from discontinued operations | — |
| | (0.01 | ) | | (0.02 | ) | Net income attributable to USG | $ | 6.81 |
| | $ | 0.26 |
| | $ | 0.43 |
| | | | | | | Diluted earnings (loss) per average common share: | | | | | | Income from continuing operations attributable to USG | $ | 6.73 |
| | $ | 0.26 |
| | $ | 0.44 |
| Loss from discontinued operations | — |
| | (0.01 | ) | | (0.02 | ) | Net income attributable to USG | $ | 6.73 |
| | $ | 0.25 |
| | $ | 0.42 |
|
Stock options, RSUs, MSUs, performance shares, common shares issuable upon conversion of our 10% convertible senior notes and deferred shares associated with our deferred compensation program for non-employee directors that were not included in the computation of diluted earnings (loss) per share for those periods because their inclusion was anti-dilutive were as follows: | | | | | | | | | | (millions, common shares) | 2015 | | 2014 | | 2013 | Stock options, RSUs, MSUs and performance shares | 1.9 |
| | 2.1 |
| | 2.2 |
| 10% convertible senior notes due 2018 (a) | — |
| | — |
| | 6.6 |
| Deferred shares associated with a deferred compensation program for non-employee directors | — |
| | — |
| | 0.2 |
|
| | (a) | In December 2013 and April 2014, we converted $325 million and $75 million, respectively, of our 10% convertible senior notes due 2018 into common shares. |
|