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	Purchase	137	8/28/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	556	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	172	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	627	8/28/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	2,545	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	786	8/28/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	9	8/28/2013	$	74.02	Open Market
Relational Fund Partners, L.P.	Purchase	40	8/28/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	12	8/28/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	116	8/28/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	50	8/28/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	673	8/28/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	208	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	5,098	8/28/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	20,670	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	6,389	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	5,189	8/28/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	21,023	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	6,502	8/28/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	115	8/28/2013	$	74.02	Open Market
Relational Investors XV, L.P.	Purchase	467	8/28/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	144	8/28/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	65	8/28/2013	$	74.02	Open Market
Relational Investors XVI, L.P.	Purchase	263	8/28/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	81	8/28/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	66	8/28/2013	$	74.02	Open Market
Relational Investors XX, L.P.	Purchase	269	8/28/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	83	8/28/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	72	8/28/2013	$	74.02	Open Market
Relational Investors XXIII, L.P.	Purchase	295	8/28/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	91	8/28/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	165	8/28/2013	$	74.02	Open Market
Relational Investors XXIV, L.P.	Purchase	670	8/28/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	207	8/28/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	100	8/28/2013	$	74.02	Open Market
RH Fund 1, L.P.	Purchase	406	8/28/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	125	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	59	8/29/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	272	8/29/2013	$	74.02	Open Market
Relational Fund Partners, L.P.	Purchase	3	8/29/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	50	8/29/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	22	8/29/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	2,213	8/29/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	2,257	8/29/2013	$	74.02	Open Market
Relational Investors XV, L.P.	Purchase	50	8/29/2013	$	74.02	Open Market
Relational Investors XVI, L.P.	Purchase	28	8/29/2013	$	74.02	Open Market
Relational Investors XX, L.P.	Purchase	28	8/29/2013	$	74.02	Open Market
Relational Investors XXIII, L.P.	Purchase	31	8/29/2013	$	74.02	Open Market
Relational Investors XXIV, L.P.	Purchase	71	8/29/2013	$	74.02	Open Market
RH Fund 1, L.P.	Purchase	43	8/29/2013	$	74.02	Open Market

Relational Investors LLC	Purchase	377	8/30/2013	$	74.00	Open Market
Relational Investors LLC	Purchase	1,637	8/30/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	1,724	8/30/2013	$	74.00	Open Market
Relational Investors LLC	Purchase	7,486	8/30/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	27	8/30/2013	$	74.00	Open Market
Relational Fund Partners, L.P.	Purchase	123	8/30/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	456	8/30/2013	$	74.00	Open Market
Relational Investors IX, L.P.	Purchase	1,387	8/30/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	595	8/30/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	14,005	8/30/2013	$	74.00	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	60,787	8/30/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	14,244	8/30/2013	$	74.00	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	61,801	8/30/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	316	8/30/2013	$	74.00	Open Market
Relational Investors XV, L.P.	Purchase	1,374	8/30/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	178	8/30/2013	$	74.00	Open Market
Relational Investors XVI, L.P.	Purchase	776	8/30/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	182	8/30/2013	$	74.00	Open Market
Relational Investors XX, L.P.	Purchase	792	8/30/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	200	8/30/2013	$	74.00	Open Market
Relational Investors XXIII, L.P.	Purchase	870	8/30/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	454	8/30/2013	$	74.00	Open Market
Relational Investors XXIV, L.P.	Purchase	1,970	8/30/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	275	8/30/2013	$	74.00	Open Market
RH Fund 1, L.P.	Purchase	1,195	8/30/2013	$	74.01	Open Market