Stock-Based Compensation (Weighted Average Assumptions Used in Calculating Fair Value of Stock Option) (Details) |
3 Months Ended |
|---|---|
|
Mar. 31, 2016
$ / shares
| |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
| Weighted average exercise price | $ 95.06 |
| Risk free interest rate | 1.60% |
| Expected life of option in years | 6 years 6 months |
| Expected dividend yield | 2.10% |
| Expected volatility | 22.80% |