Exhibit A
Transactions by Reporting Persons in the last 60 days.
Beneficial Ownership |
| Purchase or |
| Quantity |
| Transaction |
| Price per Share |
| How Effected |
|
|
|
|
|
|
|
|
|
|
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 17,460 |
| 5/14/2012 |
| 63.95 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 14,576 |
| 5/14/2012 |
| 64.66 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 8,188 |
| 5/14/2012 |
| 63.95 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 6,836 |
| 5/14/2012 |
| 64.66 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 4,298 |
| 5/14/2012 |
| 63.95 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 3,588 |
| 5/14/2012 |
| 64.66 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 1,050 |
| 5/15/2012 |
| 65.92 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 9,955 |
| 5/15/2012 |
| 65.99 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 40,181 |
| 5/15/2012 |
| 66.35 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 492 |
| 5/15/2012 |
| 65.92 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 4,669 |
| 5/15/2012 |
| 65.99 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 369 |
| 5/15/2012 |
| 66.35 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 258 |
| 5/15/2012 |
| 65.92 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 2,451 |
| 5/15/2012 |
| 65.99 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 17,820 |
| 5/15/2012 |
| 66.35 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 44,908 |
| 5/16/2012 |
| 67.39 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 412 |
| 5/16/2012 |
| 67.39 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 19,916 |
| 5/16/2012 |
| 67.39 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 34,420 |
| 5/17/2012 |
| 66.48 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 34,420 |
| 5/17/2012 |
| 65.91 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 17,210 |
| 5/17/2012 |
| 65.99 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 21,425 |
| 5/17/2012 |
| 65.75 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 316 |
| 5/17/2012 |
| 66.48 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 316 |
| 5/17/2012 |
| 65.91 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 158 |
| 5/17/2012 |
| 65.99 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 197 |
| 5/17/2012 |
| 65.75 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 15,264 |
| 5/17/2012 |
| 66.48 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 15,264 |
| 5/17/2012 |
| 65.91 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 7,632 |
| 5/17/2012 |
| 65.99 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 9,502 |
| 5/17/2012 |
| 65.75 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 10,937 |
| 5/18/2012 |
| 65.10 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 69,357 |
| 5/18/2012 |
| 64.15 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 100 |
| 5/18/2012 |
| 65.10 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 640 |
| 5/18/2012 |
| 64.15 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 4,851 |
| 5/18/2012 |
| 65.10 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 30,764 |
| 5/18/2012 |
| 64.15 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 12,939 |
| 5/23/2012 |
| 63.55 |
| Open Market |
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 523 |
| 5/23/2012 |
| 62.91 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 7,437 |
| 5/23/2012 |
| 63.55 |
| Open Market |
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 299 |
| 5/23/2012 |
| 62.91 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 4,590 |
| 5/23/2012 |
| 63.55 |
| Open Market |
Relational Investors LLC |
| Purchase |
| 185 |
| 5/23/2012 |
| 62.91 |
| Open Market |