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+ Details

Net Income Per Share (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended					3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Jun. 30, 2012 Warrants	Jul. 14, 2011 Warrants	Jun. 30, 2012 0.75% Convertible Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from net income per share	21	12
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%		0.75%			0.75%
Convertible Senior Notes due						2016
Conversion price per share						$ 31.74
Warrants, Conversion price per share				41.14	41.14