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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Assumptions Used For LTIP And TSOP Grants
The assumptions for the 2016 LTIP and TSOP grants are shown in the following table:
 
Average expected volatility
27%

Average risk-free interest rate
2.00%

Average expected option term LTIP
8.9 years

Per-share grant-date fair value LTIP
$
19.92

Average expected option term TSOP
8.6 years

Per-share grant-date fair value TSOP
$
14.75