| Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] |
Management Stock Ownership Program (MSOP), Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award, Grant Date [Domain] |
Share-based Compensation Arrangements by Share-based Payment Award, Grant Type [Domain] |
Annual [Member] | Progressive (Reload) [Member] |
2007 | 2006 | 2005 | 2007 | 2006 | 2005 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Share-based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions [Abstract] | | | | | | |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | 84.79 | 87.23 | 76.87 | 87.12 | 80.44 | 81.19 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 4.6% | 5% | 4% | | 4.5% | 3.7% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 2.1% | 2% | 2% | 2.1% | 2% | 2% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 20% | 20% | 23.5% | 18.4% | 20.1% | 20.9% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 5.25 | 5.25 | 5.25 | 2.80 | 3.25 | 3.33 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Black-Scholes Fair Value | 18.12 | 19.81 | 18.28 | 13.26 | 12.53 | 13.18 |