Exhibit A

Transactions by Reporting Persons in the last 60 days not previously reported.

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)		How Effected
Relational Investors LLC	Sale	4,475	2/6/2015	$	49.33	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	11,109	2/6/2015	$	49.33	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,487	2/6/2015	$	49.33	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	9,375	2/6/2015	$	49.33	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	29,636	2/6/2015	$	49.33	Open Market
Relational Investors LLC	Sale	3,078	2/6/2015	$	49.33	Open Market
Relational Investors LLC	Sale	8,403	2/6/2015	$	49.33	Open Market
Relational Investors LLC	Sale	7,209	2/6/2015	$	49.33	Open Market
Relational Coast Partners, L.P.	Sale	769	2/6/2015	$	49.33	Open Market
Relational Coast Partners, L.P.	Sale	1,395	2/6/2015	$	49.33	Open Market
Relational Coast Partners, L.P.	Sale	1,123	2/6/2015	$	49.33	Open Market
Relational Fund Partners, L.P.	Sale	35	2/6/2015	$	49.33	Open Market
Relational Fund Partners, L.P.	Sale	150	2/6/2015	$	49.33	Open Market
Relational Fund Partners, L.P.	Sale	142	2/6/2015	$	49.33	Open Market
Relational Fund Partners, L.P.	Sale	4	2/6/2015	$	49.33	Open Market
RH Fund 1, L.P.	Sale	985	2/6/2015	$	49.33	Open Market
RH Fund 1, L.P.	Sale	1,237	2/6/2015	$	49.33	Open Market
RH Fund 1, L.P.	Sale	705	2/6/2015	$	49.33	Open Market
Relational Investors XV, L.P.	Sale	165	2/6/2015	$	49.33	Open Market
Relational Investors XV, L.P.	Sale	1,538	2/6/2015	$	49.33	Open Market
Relational Investors XV, L.P.	Sale	1,459	2/6/2015	$	49.33	Open Market
Relational Investors XV, L.P.	Sale	328	2/6/2015	$	49.33	Open Market
Relational Investors XVI, L.P.	Sale	460	2/6/2015	$	49.33	Open Market
Relational Investors XVI, L.P.	Sale	820	2/6/2015	$	49.33	Open Market
Relational Investors XVI, L.P.	Sale	494	2/6/2015	$	49.33	Open Market
Relational Investors XX, L.P.	Sale	1,105	2/6/2015	$	49.33	Open Market
Relational Investors XX, L.P.	Sale	1,332	2/6/2015	$	49.33	Open Market
Relational Investors XX, L.P.	Sale	708	2/6/2015	$	49.33	Open Market
Relational Investors XXIII, L.P.	Sale	1,504	2/6/2015	$	49.33	Open Market
Relational Investors XXIII, L.P.	Sale	1,867	2/6/2015	$	49.33	Open Market
Relational Investors XXIII, L.P.	Sale	1,035	2/6/2015	$	49.33	Open Market
Relational Investors IX, L.P.	Sale	634	2/6/2015	$	49.33	Open Market
Relational Investors IX, L.P.	Sale	1,360	2/6/2015	$	49.33	Open Market
Relational Investors IX, L.P.	Sale	583	2/6/2015	$	49.33	Open Market
Relational Investors IX, L.P.	Sale	1,640	2/6/2015	$	49.33	Open Market
Relational Investors LLC	Sale	10,383	2/6/2015	$	49.33	Open Market
Relational Investors XXIV, L.P.	Sale	235	2/6/2015	$	49.33	Open Market
Relational Investors XXIV, L.P.	Sale	309	2/6/2015	$	49.33	Open Market
Relational Investors LLC	Sale	9,707	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	37,756	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	6,528	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,926	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,444	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	4,621	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	2,008	2/9/2015	$	50.18	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	57,645	2/9/2015	$	50.18	Open Market
Relational Investors LLC	Sale	762	2/9/2015	$	50.18	Open Market

Relational Investors LLC	Sale	12,749	2/9/2015	$	50.18	Open Market
Relational Investors LLC	Sale	12,215	2/9/2015	$	50.18	Open Market
Relational Investors LLC	Sale	14,811	2/9/2015	$	50.18	Open Market
Relational Coast Partners, L.P.	Sale	1,109	2/9/2015	$	50.18	Open Market
Relational Coast Partners, L.P.	Sale	2,139	2/9/2015	$	50.18	Open Market
Relational Coast Partners, L.P.	Sale	3,882	2/9/2015	$	50.18	Open Market
Relational Fund Partners, L.P.	Sale	223	2/9/2015	$	50.18	Open Market
Relational Fund Partners, L.P.	Sale	218	2/9/2015	$	50.18	Open Market
Relational Fund Partners, L.P.	Sale	278	2/9/2015	$	50.18	Open Market
RH Fund 1, L.P.	Sale	1,274	2/9/2015	$	50.18	Open Market
RH Fund 1, L.P.	Sale	1,896	2/9/2015	$	50.18	Open Market
RH Fund 1, L.P.	Sale	3,178	2/9/2015	$	50.18	Open Market
Relational Investors XV, L.P.	Sale	2,005	2/9/2015	$	50.18	Open Market
Relational Investors XV, L.P.	Sale	2,235	2/9/2015	$	50.18	Open Market
Relational Investors XV, L.P.	Sale	3,329	2/9/2015	$	50.18	Open Market
Relational Investors XVI, L.P.	Sale	312	2/9/2015	$	50.18	Open Market
Relational Investors XVI, L.P.	Sale	764	2/9/2015	$	50.18	Open Market
Relational Investors XVI, L.P.	Sale	1,223	2/9/2015	$	50.18	Open Market
Relational Investors XVI, L.P.	Sale	1,172	2/9/2015	$	50.18	Open Market
Relational Investors XVI, L.P.	Sale	376	2/9/2015	$	50.18	Open Market
Relational Investors XX, L.P.	Sale	1,423	2/9/2015	$	50.18	Open Market
Relational Investors XX, L.P.	Sale	2,042	2/9/2015	$	50.18	Open Market
Relational Investors XX, L.P.	Sale	3,358	2/9/2015	$	50.18	Open Market
Relational Investors XXIII, L.P.	Sale	1,952	2/9/2015	$	50.18	Open Market
Relational Investors XXIII, L.P.	Sale	2,862	2/9/2015	$	50.18	Open Market
Relational Investors XXIII, L.P.	Sale	4,742	2/9/2015	$	50.18	Open Market
Relational Investors IX, L.P.	Sale	270	2/9/2015	$	50.18	Open Market
Relational Investors IX, L.P.	Sale	1,812	2/9/2015	$	50.18	Open Market
Relational Investors IX, L.P.	Sale	2,899	2/9/2015	$	50.18	Open Market
Relational Investors IX, L.P.	Sale	2,777	2/9/2015	$	50.18	Open Market
Relational Investors IX, L.P.	Sale	1,388	2/9/2015	$	50.18	Open Market
Relational Investors LLC	Sale	22,520	2/9/2015	$	50.18	Open Market
Relational Investors XXIV, L.P.	Sale	718	2/9/2015	$	50.18	Open Market
Relational Investors XXIV, L.P.	Sale	37	2/9/2015	$	50.18	Open Market
Relational Investors XXIV, L.P.	Sale	427	2/9/2015	$	50.18	Open Market
Relational Investors LLC	Sale	8,149	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	18,308	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	13,667	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	8,028	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	5,981	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	8,801	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	2,603	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	26,636	2/10/2015	$	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	9,915	2/10/2015	$	50.08	Open Market
Relational Investors LLC	Sale	25,446	2/10/2015	$	50.08	Open Market
Relational Investors LLC	Sale	1,475	2/10/2015	$	50.08	Open Market
Relational Investors LLC	Sale	7,108	2/10/2015	$	50.08	Open Market

Relational Coast Partners, L.P.	Sale	3,167	2/10/2015	$	50.08	Open Market
Relational Coast Partners, L.P.	Sale	258	2/10/2015	$	50.08	Open Market
Relational Coast Partners, L.P.	Sale	2,561	2/10/2015	$	50.08	Open Market
Relational Fund Partners, L.P.	Sale	441	2/10/2015	$	50.08	Open Market
Relational Fund Partners, L.P.	Sale	26	2/10/2015	$	50.08	Open Market
Relational Fund Partners, L.P.	Sale	138	2/10/2015	$	50.08	Open Market
RH Fund 1, L.P.	Sale	3,071	2/10/2015	$	50.08	Open Market
RH Fund 1, L.P.	Sale	228	2/10/2015	$	50.08	Open Market
RH Fund 1, L.P.	Sale	2,031	2/10/2015	$	50.08	Open Market
Relational Investors XV, L.P.	Sale	4,039	2/10/2015	$	50.08	Open Market
Relational Investors XV, L.P.	Sale	269	2/10/2015	$	50.08	Open Market
Relational Investors XV, L.P.	Sale	2,047	2/10/2015	$	50.08	Open Market
Relational Investors XVI, L.P.	Sale	3,231	2/10/2015	$	50.08	Open Market
Relational Investors XX, L.P.	Sale	3,374	2/10/2015	$	50.08	Open Market
Relational Investors XX, L.P.	Sale	246	2/10/2015	$	50.08	Open Market
Relational Investors XX, L.P.	Sale	2,109	2/10/2015	$	50.08	Open Market
Relational Investors XXIII, L.P.	Sale	4,690	2/10/2015	$	50.08	Open Market
Relational Investors XXIII, L.P.	Sale	346	2/10/2015	$	50.08	Open Market
Relational Investors XXIII, L.P.	Sale	2,987	2/10/2015	$	50.08	Open Market
Relational Investors IX, L.P.	Sale	5,375	2/10/2015	$	50.08	Open Market
Relational Investors IX, L.P.	Sale	2,304	2/10/2015	$	50.08	Open Market
Relational Investors LLC	Sale	18,905	2/10/2015	$	50.08	Open Market
Relational Investors XXIV, L.P.	Sale	769	2/10/2015	$	50.08	Open Market
Relational Investors XXIV, L.P.	Sale	158	2/10/2015	$	50.08	Open Market
Relational Investors XXIV, L.P.	Sale	46	2/10/2015	$	50.08	Open Market
Relational Investors XXIV, L.P.	Sale	20	2/10/2015	$	50.08	Open Market