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 LLC	Sale	298	6/11/2015	$	93.89	Open Market
Relational Investors LLC	Sale	2,536	6/11/2015	$	93.59	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	3,144	6/11/2015	$	93.89	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	26,722	6/11/2015	$	93.59	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	3,180	6/11/2015	$	93.89	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	829	6/11/2015	$	93.59	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	8,473	6/11/2015	$	93.59	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	17,675	6/11/2015	$	93.59	Open Market
Relational Investors LLC	Sale	1,252	6/11/2015	$	93.89	Open Market
Relational Investors LLC	Sale	6,412	6/11/2015	$	93.59	Open Market
Relational Investors LLC	Sale	3,936	6/11/2015	$	93.59	Open Market
Relational Investors LLC	Sale	293	6/11/2015	$	93.59	Open Market
Relational Coast Partners, L.P.	Sale	208	6/11/2015	$	93.89	Open Market
Relational Coast Partners, L.P.	Sale	963	6/11/2015	$	93.59	Open Market
Relational Coast Partners, L.P.	Sale	601	6/11/2015	$	93.59	Open Market
Relational Coast Partners, L.P.	Sale	207	6/11/2015	$	93.59	Open Market
Relational Fund Partners, L.P.	Sale	22	6/11/2015	$	93.90	Open Market
Relational Fund Partners, L.P.	Sale	121	6/11/2015	$	93.59	Open Market
Relational Fund Partners, L.P.	Sale	66	6/11/2015	$	93.59	Open Market
RH Fund 1, L.P.	Sale	195	6/11/2015	$	93.89	Open Market
RH Fund 1, L.P.	Sale	1,461	6/11/2015	$	93.59	Open Market
RH Fund 1, L.P.	Sale	201	6/11/2015	$	93.59	Open Market
Relational Investors XV, L.P.	Sale	225	6/11/2015	$	93.89	Open Market
Relational Investors XV, L.P.	Sale	946	6/11/2015	$	93.59	Open Market
Relational Investors XV, L.P.	Sale	601	6/11/2015	$	93.59	Open Market
Relational Investors XV, L.P.	Sale	365	6/11/2015	$	93.59	Open Market
Relational Investors XVI, L.P.	Sale	118	6/11/2015	$	93.89	Open Market
Relational Investors XVI, L.P.	Sale	535	6/11/2015	$	93.59	Open Market
Relational Investors XVI, L.P.	Sale	335	6/11/2015	$	93.59	Open Market
Relational Investors XVI, L.P.	Sale	134	6/11/2015	$	93.59	Open Market
Relational Investors XX, L.P.	Sale	205	6/11/2015	$	93.89	Open Market
Relational Investors XX, L.P.	Sale	984	6/11/2015	$	93.59	Open Market
Relational Investors XX, L.P.	Sale	611	6/11/2015	$	93.59	Open Market
Relational Investors XX, L.P.	Sale	155	6/11/2015	$	93.59	Open Market
Relational Investors XXIII, L.P.	Sale	289	6/11/2015	$	93.89	Open Market
Relational Investors XXIII, L.P.	Sale	1,409	6/11/2015	$	93.59	Open Market
Relational Investors XXIII, L.P.	Sale	872	6/11/2015	$	93.59	Open Market
Relational Investors XXIII, L.P.	Sale	176	6/11/2015	$	93.59	Open Market
Relational Investors IX, L.P.	Sale	280	6/11/2015	$	93.89	Open Market
Relational Investors IX, L.P.	Sale	709	6/11/2015	$	93.59	Open Market

Relational Investors IX, L.P.	Sale	424	6/11/2015	$	93.59	Open Market
Relational Investors IX, L.P.	Sale	508	6/11/2015	$	93.59	Open Market
Relational Investors IX, L.P.	Sale	29	6/11/2015	$	93.59	Open Market
Relational Investors IX, L.P.	Sale	189	6/11/2015	$	93.59	Open Market
Relational Investors IX, L.P.	Sale	527	6/11/2015	$	93.59	Open Market
Relational Investors LLC	Sale	1,263	6/11/2015	$	93.89	Open Market
Relational Investors LLC	Sale	10,733	6/11/2015	$	93.59	Open Market
Relational Investors XXIV, L.P.	Sale	30	6/11/2015	$	93.89	Open Market
Relational Investors XXIV, L.P.	Sale	137	6/11/2015	$	93.59	Open Market
Relational Investors XXIV, L.P.	Sale	125	6/11/2015	$	93.59	Open Market
Relational Investors LLC	Sale	1,374	6/12/2015	$	93.22	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	14,477	6/12/2015	$	93.22	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	1,367	6/12/2015	$	93.22	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	13,247	6/12/2015	$	93.22	Open Market
Relational Investors LLC	Sale	4,989	6/12/2015	$	93.22	Open Market
Relational Investors LLC	Sale	775	6/12/2015	$	93.22	Open Market
Relational Coast Partners, L.P.	Sale	691	6/12/2015	$	93.22	Open Market
Relational Coast Partners, L.P.	Sale	269	6/12/2015	$	93.22	Open Market
Relational Fund Partners, L.P.	Sale	7	6/12/2015	$	93.22	Open Market
Relational Fund Partners, L.P.	Sale	95	6/12/2015	$	93.22	Open Market
RH Fund 1, L.P.	Sale	649	6/12/2015	$	93.22	Open Market
RH Fund 1, L.P.	Sale	251	6/12/2015	$	93.22	Open Market
Relational Investors XV, L.P.	Sale	568	6/12/2015	$	93.22	Open Market
Relational Investors XV, L.P.	Sale	468	6/12/2015	$	93.22	Open Market
Relational Investors XVI, L.P.	Sale	393	6/12/2015	$	93.22	Open Market
Relational Investors XVI, L.P.	Sale	151	6/12/2015	$	93.22	Open Market
Relational Investors XX, L.P.	Sale	706	6/12/2015	$	93.22	Open Market
Relational Investors XX, L.P.	Sale	242	6/12/2015	$	93.22	Open Market
Relational Investors XXIII, L.P.	Sale	1,044	6/12/2015	$	93.22	Open Market
Relational Investors XXIII, L.P.	Sale	287	6/12/2015	$	93.22	Open Market
Relational Investors IX, L.P.	Sale	689	6/12/2015	$	93.22	Open Market
Relational Investors IX, L.P.	Sale	216	6/12/2015	$	93.22	Open Market
Relational Investors IX, L.P.	Sale	388	6/12/2015	$	93.22	Open Market
Relational Investors LLC	Sale	5,815	6/12/2015	$	93.22	Open Market
Relational Investors XXIV, L.P.	Sale	83	6/12/2015	$	93.22	Open Market
Relational Investors XXIV, L.P.	Sale	59	6/12/2015	$	93.22	Open Market
Relational Investors LLC	Sale	1,310	6/15/2015	$	92.37	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	13,801	6/15/2015	$	92.36	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	11,064	6/15/2015	$	92.36	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	1,313	6/15/2015	$	92.36	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	1,555	6/15/2015	$	92.37	Open Market
Relational Investors LLC	Sale	5,496	6/15/2015	$	92.36	Open Market
Relational Coast Partners, L.P.	Sale	845	6/15/2015	$	92.36	Open Market
Relational Coast Partners, L.P.	Sale	70	6/15/2015	$	92.37	Open Market
Relational Fund Partners, L.P.	Sale	5	6/15/2015	$	92.36	Open Market
Relational Fund Partners, L.P.	Sale	92	6/15/2015	$	92.36	Open Market
RH Fund 1, L.P.	Sale	545	6/15/2015	$	92.36	Open Market

RH Fund 1, L.P.	Sale	313	6/15/2015	$	92.37	Open Market
Relational Investors XV, L.P.	Sale	689	6/15/2015	$	92.36	Open Market
Relational Investors XV, L.P.	Sale	298	6/15/2015	$	92.37	Open Market
Relational Investors XVI, L.P.	Sale	502	6/15/2015	$	92.36	Open Market
Relational Investors XVI, L.P.	Sale	17	6/15/2015	$	92.36	Open Market
Relational Investors XX, L.P.	Sale	825	6/15/2015	$	92.36	Open Market
Relational Investors XX, L.P.	Sale	79	6/15/2015	$	92.37	Open Market
Relational Investors XXIII, L.P.	Sale	1,226	6/15/2015	$	92.37	Open Market
Relational Investors XXIII, L.P.	Sale	43	6/15/2015	$	92.36	Open Market
Relational Investors IX, L.P.	Sale	451	6/15/2015	$	92.36	Open Market
Relational Investors IX, L.P.	Sale	411	6/15/2015	$	92.37	Open Market
Relational Investors IX, L.P.	Sale	41	6/15/2015	$	92.36	Open Market
Relational Investors IX, L.P.	Sale	329	6/15/2015	$	92.37	Open Market
Relational Investors LLC	Sale	5,544	6/15/2015	$	92.36	Open Market
Relational Investors XXIV, L.P.	Sale	76	6/15/2015	$	92.36	Open Market
Relational Investors XXIV, L.P.	Sale	60	6/15/2015	$	92.37	Open Market
Relational Investors LLC	Sale	2,244	6/16/2015	$	92.67	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	23,640	6/16/2015	$	92.67	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	13,462	6/16/2015	$	92.67	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	10,392	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	278	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	4,257	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	1,905	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	1,672	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	1,302	6/16/2015	$	92.67	Open Market
Relational Coast Partners, L.P.	Sale	654	6/16/2015	$	92.67	Open Market
Relational Coast Partners, L.P.	Sale	323	6/16/2015	$	92.67	Open Market
Relational Coast Partners, L.P.	Sale	284	6/16/2015	$	92.67	Open Market
Relational Coast Partners, L.P.	Sale	307	6/16/2015	$	92.67	Open Market
Relational Fund Partners, L.P.	Sale	33	6/16/2015	$	92.67	Open Market
Relational Fund Partners, L.P.	Sale	81	6/16/2015	$	92.67	Open Market
Relational Fund Partners, L.P.	Sale	35	6/16/2015	$	92.67	Open Market
Relational Fund Partners, L.P.	Sale	17	6/16/2015	$	92.67	Open Market
RH Fund 1, L.P.	Sale	673	6/16/2015	$	92.67	Open Market
RH Fund 1, L.P.	Sale	641	6/16/2015	$	92.67	Open Market
RH Fund 1, L.P.	Sale	157	6/16/2015	$	92.67	Open Market
Relational Investors XV, L.P.	Sale	454	6/16/2015	$	92.67	Open Market
Relational Investors XV, L.P.	Sale	336	6/16/2015	$	92.67	Open Market
Relational Investors XV, L.P.	Sale	295	6/16/2015	$	92.67	Open Market
Relational Investors XV, L.P.	Sale	607	6/16/2015	$	92.67	Open Market
Relational Investors XVI, L.P.	Sale	407	6/16/2015	$	92.67	Open Market
Relational Investors XVI, L.P.	Sale	189	6/16/2015	$	92.67	Open Market
Relational Investors XVI, L.P.	Sale	166	6/16/2015	$	92.67	Open Market
Relational Investors XVI, L.P.	Sale	127	6/16/2015	$	92.67	Open Market
Relational Investors XX, L.P.	Sale	614	6/16/2015	$	92.67	Open Market
Relational Investors XX, L.P.	Sale	309	6/16/2015	$	92.67	Open Market
Relational Investors XX, L.P.	Sale	272	6/16/2015	$	92.67	Open Market

Relational Investors XX, L.P.	Sale	353	6/16/2015	$	92.67	Open Market
Relational Investors XXIII, L.P.	Sale	940	6/16/2015	$	92.67	Open Market
Relational Investors XXIII, L.P.	Sale	439	6/16/2015	$	92.67	Open Market
Relational Investors XXIII, L.P.	Sale	385	6/16/2015	$	92.67	Open Market
Relational Investors XXIII, L.P.	Sale	410	6/16/2015	$	92.67	Open Market
Relational Investors IX, L.P.	Sale	650	6/16/2015	$	92.67	Open Market
Relational Investors IX, L.P.	Sale	437	6/16/2015	$	92.67	Open Market
Relational Investors IX, L.P.	Sale	384	6/16/2015	$	92.67	Open Market
Relational Investors IX, L.P.	Sale	7	6/16/2015	$	92.67	Open Market
Relational Investors IX, L.P.	Sale	634	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	9,495	6/16/2015	$	92.67	Open Market
Relational Investors XXIV, L.P.	Sale	53	6/16/2015	$	92.67	Open Market
Relational Investors XXIV, L.P.	Sale	180	6/16/2015	$	92.67	Open Market
Relational Investors LLC	Sale	1,297	6/17/2015	$	92.66	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	13,653	6/17/2015	$	92.66	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	13,767	6/17/2015	$	92.66	Open Market
Relational Investors LLC	Sale	5,437	6/17/2015	$	92.66	Open Market
Relational Coast Partners, L.P.	Sale	906	6/17/2015	$	92.66	Open Market
Relational Fund Partners, L.P.	Sale	14	6/17/2015	$	92.66	Open Market
Relational Fund Partners, L.P.	Sale	83	6/17/2015	$	92.66	Open Market
RH Fund 1, L.P.	Sale	129	6/17/2015	$	92.66	Open Market
RH Fund 1, L.P.	Sale	251	6/17/2015	$	92.66	Open Market
RH Fund 1, L.P.	Sale	470	6/17/2015	$	92.66	Open Market
Relational Investors XV, L.P.	Sale	978	6/17/2015	$	92.66	Open Market
Relational Investors XVI, L.P.	Sale	514	6/17/2015	$	92.66	Open Market
Relational Investors XX, L.P.	Sale	895	6/17/2015	$	92.66	Open Market
Relational Investors XXIII, L.P.	Sale	1,257	6/17/2015	$	92.66	Open Market
Relational Investors IX, L.P.	Sale	854	6/17/2015	$	92.66	Open Market
Relational Investors IX, L.P.	Sale	366	6/17/2015	$	92.66	Open Market
Relational Investors LLC	Sale	5,485	6/17/2015	$	92.66	Open Market
Relational Investors XXIV, L.P.	Sale	135	6/17/2015	$	92.66	Open Market
Relational Investors LLC	Sale	80,555	7/7/2015	$	92.65	Privately Negotiated
Relational Investors LLC	Sale	81,255	7/7/2015	$	92.65	Privately Negotiated
Relational Investors LLC	Sale	19,203	7/7/2015	$	92.65	Privately Negotiated
Relational Investors Mid-Cap Fund I, L.P.	Sale	202,293	7/7/2015	$	92.65	Privately Negotiated
Relational Investors Mid-Cap Fund II, L.P.	Sale	204,176	7/7/2015	$	92.65	Privately Negotiated
Relational Coast Partners, L.P.	Sale	13,413	7/7/2015	$	92.65	Privately Negotiated
Relational Fund Partners, L.P.	Sale	1,422	7/7/2015	$	92.65	Privately Negotiated
RH Fund 1, L.P.	Sale	12,582	7/7/2015	$	92.65	Privately Negotiated
Relational Investors XV, L.P.	Sale	14,476	7/7/2015	$	92.65	Privately Negotiated
Relational Investors XVI, L.P.	Sale	7,606	7/7/2015	$	92.65	Privately Negotiated
Relational Investors XX, L.P.	Sale	13,247	7/7/2015	$	92.65	Privately Negotiated
Relational Investors XXIII, L.P.	Sale	18,603	7/7/2015	$	92.65	Privately Negotiated
Relational Investors XXIV, L.P.	Sale	1,989	7/7/2015	$	92.65	Privately Negotiated
Relational Investors IX, L.P.	Sale	18,065	7/7/2015	$	92.65	Privately Negotiated