Debt (Details Textual) (USD $)	1 Months Ended	6 Months Ended	1 Months Ended											45 Months Ended
	May 31, 2011	Jun. 30, 2011	Dec. 31, 2009 Arrow Business Acquisition [Member] Mandatorily Redeemable Preferred Stock [Member]	Dec. 02, 2009 Arrow Business Acquisition [Member] Mandatorily Redeemable Preferred Stock [Member]	Jun. 30, 2011 Senior Notes Due 2014 [Member]	Dec. 31, 2010 Senior Notes Due 2014 [Member]	Jun. 30, 2011 Senior Notes Due 2019 [Member]	Dec. 31, 2010 Senior Notes Due 2019 [Member]	Jun. 30, 2011 Senior Notes [Member]	Dec. 31, 2010 Senior Notes [Member]	Dec. 02, 2012 Mandatorily Redeemable Preferred Stock [Member]	Dec. 02, 2009 Mandatorily Redeemable Preferred Stock [Member]	Jun. 30, 2011 Term Facility [Member]	Jul. 31, 2010 2006 Credit Facility [Member]	Jun. 30, 2011 2006 Credit Facility [Member]	Jun. 30, 2011 Revolving credit facility [Member]
Debt [Abstract]
Minimum written notice required for redemption the senior notes, in days		15 days
Revolving facility	$ 250,000,000	$ 250,000,000
Maximum written period permitted for redemption the senior notes, in days		60 days
Redemption price equal to greater of principal amount of Senior Notes redeemed		Equal to the greater of 100% of the principal amount of the Senior Notes to be redeemed and the sum of the present values of the remaining scheduled payments plus 40 basis points
Repurchase Senior Notes for cash at a repurchase price equal to percentage of principal amount		101% of the principal amount of the Senior Notes to be repurchased plus accrued and unpaid interest to the date of purchase
Debt (Textuals) [Abstract]
Carrying value of notes					450,000,000	450,000,000	400,000,000	400,000,000	850,000,000	850,000,000
Effective annual interest rate on notes					5.43%		6.35%
Issuance of newly designed non-voting Series A Preferred Stock			200,000
Preferred Stock of Watson, par value				1,000
Fair value of the Mandatorily Redeemable Preferred Stock				200,000,000								150,000,000
Discount rate of Redeemable Preferred Stock												9.63%
Mandatory redemption value for Mandatorily Redeemable Preferred Stock											200,000,000
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity													$ 650,000,000		$ 1,150,000,000	$ 500,000,000
Facility Interest Rate Description														Initial interest rate equal to LIBOR plus 0.75%. Changed in July 2010, and was reduced to LIBOR plus 0.625%.