Financing Arrangement (Narrative) (Details) (USD $)			1 Months Ended		1 Months Ended			1 Months Ended	42 Months Ended		1 Months Ended	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jul. 31, 2011 Convertible Note Hedge [Member]	Jul. 14, 2011 Convertible Note Hedge [Member]	Jul. 31, 2011 Warrants [Member]	Mar. 31, 2012 Warrants [Member]	Jul. 14, 2011 Warrants [Member]	Aug. 31, 2011 Revolving Credit Facility [Member]	Feb. 29, 2016 Revolving Credit Facility [Member]	Aug. 30, 2012 Revolving Credit Facility [Member]	Jul. 31, 2011 0.75% Convertible Senior Notes Due 2016 [Member] days	Dec. 31, 2012 0.75% Convertible Senior Notes Due 2016 [Member]	Mar. 31, 2012 0.75% Convertible Senior Notes Due 2016 [Member]	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016 [Member]	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016 [Member] Liability Component [Member]	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016 [Member] Equity Component [Member]
0.75% Convertible Senior Notes Due 2016 [Abstract]
Principal amount	$ 632,500,000	$ 632,500,000												$ 632,500,000
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%	0.75%											0.75%	0.75%
Debt instrument maturity date								Feb. 29, 2016			Jul. 15, 2016
Face amount of Notes														1,000
Conversion rate of Notes											31.5075
Initial conversion price per share of Notes													$ 31.74	$ 31.74
Number of trading days greater than or equal to the initial conversion price (in days)											20
Consecutive trading days under conversion trigger (in days)											30
Trigger price as percent of conversion price											130.00%
Trigger price											$ 41.26
Number of trading day that trading price falls below 98% of last reported sales price multiplied by conversion rate (in days)											5
Consecutive trading days under conversion trigger, trading price (in days)											10
Debt trading price as a percentage of stock price times conversion rate											98.00%
0.75% convertible senior notes due 2016, net	559,000,000	539,000,000													525,000,000
Effective interest rate														4.54%
Debt issuance costs										2,000,000				15,000,000	13,000,000	2,000,000
Debt instrument remaining discount amortization period (in years)												3 years 3 months
Convertible Note Hedge and Warrants Issuance [Abstract]
Shares covered by hedge transactions				19,900,000
Strike price for convertible note hedge				$ 31.74
Amount paid for Convertible Note Hedge			107,000,000
Shares covered by Warrants issuance							19,900,000
Strike price of Warrants						41.14	41.14
Proceeds from Warrants transactions					65,000,000
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity										500,000,000
Option To Request Additional Commitments On Credit Facility										$ 250,000,000
LineofCreditFacilityTerm1									3 years 6 months