| Reconciliation of Effective Income Tax Rate | ||||||||||
| 2013 | 2012 | 2011 | ||||||||
| Statutory U.S. tax rate | 35.0 | % | 35.0 | % | 35.0 | % | ||||
| State income taxes - net of federal benefit | 0.9 | 0.9 | 0.7 | |||||||
| International income taxes - net | (6.3) | (4.2) | (4.6) | |||||||
| U.S. research and development credit | (0.7) | ― | (0.5) | |||||||
| Reserves for tax contingencies | 1.2 | (1.9) | (1.2) | |||||||
| Domestic Manufacturer's deduction | (1.6) | (1.2) | (1.5) | |||||||
| All other - net | (0.4) | 0.4 | (0.1) | |||||||
| Effective worldwide tax rate | 28.1 | % | 29.0 | % | 27.8 | % | ||||