Exhibit A

Transactions by Reporting Persons in the last 60 days.

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)		How Effected
Relational Investors Mid-Cap Fund I, L.P.	Sale	67,762	6/4/2014	$	64.93	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	5,910	6/5/2014	$	65.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	40,331	6/5/2014	$	65.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	7,722	6/5/2014	$	65.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	14,197	6/5/2014	$	65.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	7,138	6/5/2014	$	65.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	5,000	6/5/2014	$	65.16	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	5,900	6/6/2014	$	65.93	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	20,780	6/6/2014	$	65.99	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	27,562	6/6/2014	$	65.99	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,008	6/6/2014	$	65.95	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	38,737	6/6/2014	$	65.95	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	71,085	6/6/2014	$	65.95	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	45,258	6/6/2014	$	66.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	25,554	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	40,329	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	17,808	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	19,469	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	41,079	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	10,360	6/9/2014	$	66.55	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	8,480	6/10/2014	$	66.28	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	60,257	6/10/2014	$	66.28	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	50,000	6/10/2014	$	66.10	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	64,164	6/11/2014	$	66.15	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	26,088	6/11/2014	$	66.15	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	73,300	6/11/2014	$	66.18	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	34,470	6/12/2014	$	66.25	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	20,440	6/12/2014	$	66.25	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	50,000	6/12/2014	$	66.37	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	25,000	6/12/2014	$	66.25	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	9,256	6/13/2014	$	66.42	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	45,171	6/13/2014	$	66.42	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	20,573	6/13/2014	$	66.42	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	50,000	6/13/2014	$	66.30	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	24,251	6/16/2014	$	66.57	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	32,770	6/16/2014	$	66.57	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	42,979	6/16/2014	$	66.57	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	69,845	6/17/2014	$	66.53	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	28,838	6/17/2014	$	66.53	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	23,547	6/17/2014	$	66.53	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	23,353	6/17/2014	$	66.53	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	35,417	6/17/2014	$	66.53	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	41,000	6/18/2014	$	66.25	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	27,812	6/18/2014	$	66.25	Open Market
Relational Investors LLC	Sale	1,886	7/8/2014	$	48.44	Open Market
Relational Investors LLC	Sale	976	7/8/2014	$	48.32	Open Market
Relational Investors LLC	Sale	4,139	7/8/2014	$	48.44	Open Market
Relational Investors LLC	Sale	2,143	7/8/2014	$	48.32	Open Market

Relational Coast Partners, L.P.	Sale	1,405	7/8/2014	$	48.44	Open Market
Relational Coast Partners, L.P.	Sale	727	7/8/2014	$	48.32	Open Market
Relational Co-Investment Fund I, L.P.	Sale	10,961	7/8/2014	$	48.44	Open Market
Relational Co-Investment Fund I, L.P.	Sale	5,675	7/8/2014	$	48.32	Open Market
Relational Fund Partners, L.P.	Sale	145	7/8/2014	$	48.44	Open Market
Relational Fund Partners, L.P.	Sale	75	7/8/2014	$	48.32	Open Market
Relational Investors IX, L.P.	Sale	2,359	7/8/2014	$	48.44	Open Market
Relational Investors IX, L.P.	Sale	855	7/8/2014	$	48.32	Open Market
Relational Investors IX, L.P.	Sale	366	7/8/2014	$	48.32	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	114	7/8/2014	$	48.44	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	23,806	7/8/2014	$	48.44	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	12,384	7/8/2014	$	48.32	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	26,083	7/8/2014	$	48.44	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	5,693	7/8/2014	$	48.32	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	7,814	7/8/2014	$	48.32	Open Market
Relational Investors XV, L.P.	Sale	1,405	7/8/2014	$	48.44	Open Market
Relational Investors XV, L.P.	Sale	727	7/8/2014	$	48.32	Open Market
Relational Investors XVI, L.P.	Sale	413	7/8/2014	$	48.44	Open Market
Relational Investors XVI, L.P.	Sale	214	7/8/2014	$	48.32	Open Market
Relational Investors XX, L.P.	Sale	1,241	7/8/2014	$	48.44	Open Market
Relational Investors XX, L.P.	Sale	642	7/8/2014	$	48.32	Open Market
Relational Investors XXIII, L.P.	Sale	1,762	7/8/2014	$	48.44	Open Market
Relational Investors XXIII, L.P.	Sale	912	7/8/2014	$	48.32	Open Market
Relational Investors XXIV, L.P.	Sale	210	7/8/2014	$	48.44	Open Market
Relational Investors XXIV, L.P.	Sale	109	7/8/2014	$	48.32	Open Market
RH Fund 1, L.P.	Sale	625	7/8/2014	$	48.44	Open Market
RH Fund 1, L.P.	Sale	323	7/8/2014	$	48.32	Open Market
Relational Investors LLC	Sale	8,046	7/8/2014	$	48.44	Open Market
Relational Investors LLC	Sale	4,165	7/8/2014	$	48.32	Open Market
Relational Investors LLC	Sale	434	7/9/2014	$	48.37	Open Market
Relational Investors LLC	Sale	860	7/9/2014	$	48.41	Open Market
Relational Investors LLC	Sale	1,108	7/9/2014	$	48.48	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	5,513	7/9/2014	$	48.37	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	10,914	7/9/2014	$	48.41	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	14,052	7/9/2014	$	48.48	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	6,017	7/9/2014	$	48.37	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	3,940	7/9/2014	$	48.41	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	7,964	7/9/2014	$	48.41	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	15,328	7/9/2014	$	48.48	Open Market
Relational Investors LLC	Sale	954	7/9/2014	$	48.37	Open Market
Relational Investors LLC	Sale	1,272	7/9/2014	$	48.41	Open Market
Relational Investors LLC	Sale	616	7/9/2014	$	48.41	Open Market
Relational Investors LLC	Sale	2,431	7/9/2014	$	48.48	Open Market
Relational Coast Partners, L.P.	Sale	323	7/9/2014	$	48.37	Open Market
Relational Coast Partners, L.P.	Sale	641	7/9/2014	$	48.41	Open Market
Relational Coast Partners, L.P.	Sale	683	7/9/2014	$	48.48	Open Market
Relational Coast Partners, L.P.	Sale	142	7/9/2014	$	48.48	Open Market
Relational Fund Partners, L.P.	Sale	33	7/9/2014	$	48.37	Open Market
Relational Fund Partners, L.P.	Sale	66	7/9/2014	$	48.41	Open Market
Relational Fund Partners, L.P.	Sale	52	7/9/2014	$	48.48	Open Market
Relational Fund Partners, L.P.	Sale	33	7/9/2014	$	48.48	Open Market
RH Fund 1, L.P.	Sale	144	7/9/2014	$	48.37	Open Market
RH Fund 1, L.P.	Sale	202	7/9/2014	$	48.41	Open Market
RH Fund 1, L.P.	Sale	83	7/9/2014	$	48.41	Open Market
RH Fund 1, L.P.	Sale	367	7/9/2014	$	48.48	Open Market

Relational Investors XV, L.P.	Sale	324	7/9/2014	$	48.37	Open Market
Relational Investors XV, L.P.	Sale	641	7/9/2014	$	48.41	Open Market
Relational Investors XV, L.P.	Sale	538	7/9/2014	$	48.48	Open Market
Relational Investors XV, L.P.	Sale	287	7/9/2014	$	48.48	Open Market
Relational Investors XVI, L.P.	Sale	95	7/9/2014	$	48.37	Open Market
Relational Investors XVI, L.P.	Sale	129	7/9/2014	$	48.41	Open Market
Relational Investors XVI, L.P.	Sale	59	7/9/2014	$	48.41	Open Market
Relational Investors XVI, L.P.	Sale	242	7/9/2014	$	48.48	Open Market
Relational Investors XX, L.P.	Sale	286	7/9/2014	$	48.37	Open Market
Relational Investors XX, L.P.	Sale	566	7/9/2014	$	48.41	Open Market
Relational Investors XX, L.P.	Sale	358	7/9/2014	$	48.48	Open Market
Relational Investors XX, L.P.	Sale	371	7/9/2014	$	48.48	Open Market
Relational Investors XXIII, L.P.	Sale	406	7/9/2014	$	48.37	Open Market
Relational Investors XXIII, L.P.	Sale	803	7/9/2014	$	48.41	Open Market
Relational Investors XXIII, L.P.	Sale	523	7/9/2014	$	48.48	Open Market
Relational Investors XXIII, L.P.	Sale	512	7/9/2014	$	48.48	Open Market
Relational Investors IX, L.P.	Sale	543	7/9/2014	$	48.37	Open Market
Relational Investors IX, L.P.	Sale	753	7/9/2014	$	48.41	Open Market
Relational Investors IX, L.P.	Sale	323	7/9/2014	$	48.41	Open Market
Relational Investors IX, L.P.	Sale	38	7/9/2014	$	48.48	Open Market
Relational Investors IX, L.P.	Sale	1,347	7/9/2014	$	48.48	Open Market
Relational Investors LLC	Sale	1,854	7/9/2014	$	48.37	Open Market
Relational Investors LLC	Sale	3,671	7/9/2014	$	48.41	Open Market
Relational Investors LLC	Sale	4,726	7/9/2014	$	48.48	Open Market
Relational Co-Investment Fund I, L.P.	Sale	2,526	7/9/2014	$	48.37	Open Market
Relational Co-Investment Fund I, L.P.	Sale	5,001	7/9/2014	$	48.41	Open Market
Relational Co-Investment Fund I, L.P.	Sale	6,439	7/9/2014	$	48.48	Open Market
Relational Investors XXIV, L.P.	Sale	48	7/9/2014	$	48.37	Open Market
Relational Investors XXIV, L.P.	Sale	96	7/9/2014	$	48.41	Open Market
Relational Investors XXIV, L.P.	Sale	123	7/9/2014	$	48.48	Open Market
Relational Investors LLC	Sale	1,075	7/10/2014	$	47.74	Open Market
Relational Investors LLC	Sale	111	7/10/2014	$	47.83	Open Market
Relational Investors LLC	Sale	4,139	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,814	7/10/2014	$	47.74	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	11,829	7/10/2014	$	47.74	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	1,413	7/10/2014	$	47.83	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	52,497	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	6,083	7/10/2014	$	47.74	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	8,797	7/10/2014	$	47.74	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	1,548	7/10/2014	$	47.83	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	7,426	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	753	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	29,339	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	7,108	7/10/2014	$	47.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	12,609	7/10/2014	$	47.65	Open Market
Relational Investors LLC	Sale	1,585	7/10/2014	$	47.74	Open Market
Relational Investors LLC	Sale	281	7/10/2014	$	47.74	Open Market
Relational Investors LLC	Sale	494	7/10/2014	$	47.74	Open Market
Relational Investors LLC	Sale	244	7/10/2014	$	47.83	Open Market
Relational Investors LLC	Sale	9,084	7/10/2014	$	47.65	Open Market
Relational Coast Partners, L.P.	Sale	801	7/10/2014	$	47.74	Open Market
Relational Coast Partners, L.P.	Sale	83	7/10/2014	$	47.83	Open Market
Relational Coast Partners, L.P.	Sale	124	7/10/2014	$	47.65	Open Market
Relational Coast Partners, L.P.	Sale	2,959	7/10/2014	$	47.65	Open Market
Relational Fund Partners, L.P.	Sale	79	7/10/2014	$	47.74	Open Market
Relational Fund Partners, L.P.	Sale	3	7/10/2014	$	47.74	Open Market
Relational Fund Partners, L.P.	Sale	8	7/10/2014	$	47.83	Open Market
Relational Fund Partners, L.P.	Sale	318	7/10/2014	$	47.65	Open Market

RH Fund 1, L.P.	Sale	255	7/10/2014	$	47.74	Open Market
RH Fund 1, L.P.	Sale	42	7/10/2014	$	47.74	Open Market
RH Fund 1, L.P.	Sale	59	7/10/2014	$	47.74	Open Market
RH Fund 1, L.P.	Sale	36	7/10/2014	$	47.83	Open Market
RH Fund 1, L.P.	Sale	1,373	7/10/2014	$	47.65	Open Market
Relational Investors XV, L.P.	Sale	801	7/10/2014	$	47.74	Open Market
Relational Investors XV, L.P.	Sale	18	7/10/2014	$	47.83	Open Market
Relational Investors XV, L.P.	Sale	65	7/10/2014	$	47.83	Open Market
Relational Investors XV, L.P.	Sale	3,085	7/10/2014	$	47.65	Open Market
Relational Investors XVI, L.P.	Sale	162	7/10/2014	$	47.74	Open Market
Relational Investors XVI, L.P.	Sale	28	7/10/2014	$	47.74	Open Market
Relational Investors XVI, L.P.	Sale	45	7/10/2014	$	47.74	Open Market
Relational Investors XVI, L.P.	Sale	24	7/10/2014	$	47.83	Open Market
Relational Investors XVI, L.P.	Sale	907	7/10/2014	$	47.65	Open Market
Relational Investors XX, L.P.	Sale	570	7/10/2014	$	47.74	Open Market
Relational Investors XX, L.P.	Sale	138	7/10/2014	$	47.74	Open Market
Relational Investors XX, L.P.	Sale	73	7/10/2014	$	47.83	Open Market
Relational Investors XX, L.P.	Sale	2,725	7/10/2014	$	47.65	Open Market
Relational Investors XXIII, L.P.	Sale	828	7/10/2014	$	47.74	Open Market
Relational Investors XXIII, L.P.	Sale	177	7/10/2014	$	47.74	Open Market
Relational Investors XXIII, L.P.	Sale	104	7/10/2014	$	47.83	Open Market
Relational Investors XXIII, L.P.	Sale	3,867	7/10/2014	$	47.65	Open Market
Relational Investors IX, L.P.	Sale	897	7/10/2014	$	47.74	Open Market
Relational Investors IX, L.P.	Sale	448	7/10/2014	$	47.74	Open Market
Relational Investors IX, L.P.	Sale	139	7/10/2014	$	47.83	Open Market
Relational Investors IX, L.P.	Sale	1,689	7/10/2014	$	47.65	Open Market
Relational Investors IX, L.P.	Sale	1,935	7/10/2014	$	47.65	Open Market
Relational Investors IX, L.P.	Sale	1,553	7/10/2014	$	47.65	Open Market
Relational Investors LLC	Sale	4,589	7/10/2014	$	47.74	Open Market
Relational Investors LLC	Sale	475	7/10/2014	$	47.83	Open Market
Relational Investors LLC	Sale	17,658	7/10/2014	$	47.65	Open Market
Relational Co-Investment Fund I, L.P.	Sale	6,252	7/10/2014	$	47.74	Open Market
Relational Co-Investment Fund I, L.P.	Sale	647	7/10/2014	$	47.83	Open Market
Relational Co-Investment Fund I, L.P.	Sale	24,057	7/10/2014	$	47.65	Open Market
Relational Investors XXIV, L.P.	Sale	120	7/10/2014	$	47.74	Open Market
Relational Investors XXIV, L.P.	Sale	12	7/10/2014	$	47.83	Open Market
Relational Investors XXIV, L.P.	Sale	462	7/10/2014	$	47.65	Open Market