Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended		6 Months Ended		30 Months Ended	66 Months Ended
	Jun. 11, 2010	Jun. 30, 2004	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 employee_groups	Jun. 30, 2011	Jan. 01, 2007	Jun. 30, 2012
Components of Stockholders' Equity [Line Items]
Total intrinsic value of options exercised			$ 1.0	$ 49.3	$ 12.8	$ 93.4
Cash received from option exercised			0.5	7.4	1.7	14.2
Exercise period after employment termination		3 months					1 year
Full exercise period								10 years
Number of employee groups					2
Weighted-average fair value of employee stock options granted per share			$ 45.38	$ 134.77	$ 50.11	$ 122.16
Stock repurchase plan, authorized amount	300.0
Stock repurchase program, remaining authorized repurchase amount					$ 41.0
Two Thousand And Eleven Stock Plan [Member]
Components of Stockholders' Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance			5.1		5.1			5.1
Two Thousand And Two Stock Plan [Member]
Components of Stockholders' Equity [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance			1.2		1.2			1.2